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Driverinit configuration mode value is held by devlink to enable the
driver fetch the value after reload command. In case the param type is
string devlink should copy the value from driver string buffer to
devlink string buffer on devlink_param_driverinit_value_set() and
vice-versa on devlink_param_driverinit_value_get().
Fixes: ec01aeb1803e ("devlink: Add support for get/set driverinit value")
Signed-off-by: Moshe Shemesh <[email protected]>
Acked-by: Jiri Pirko <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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In case devlink param type is string, it needs to copy the string value
it got from the input to devlink_param_value.
Fixes: e3b7ca18ad7b ("devlink: Add param set command")
Signed-off-by: Moshe Shemesh <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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Some samples require headers installation, so commit 3fca1700c4c3
("kbuild: make samples really depend on headers_install") added
such dependency in the top Makefile. However, UML fails to build
with CONFIG_SAMPLES=y because UML does not support headers_install.
Fixes: 3fca1700c4c3 ("kbuild: make samples really depend on headers_install")
Reported-by: Kees Cook <[email protected]>
Cc: David Howells <[email protected]>
Signed-off-by: Masahiro Yamada <[email protected]>
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It is best to avoid any extra overhead associated with bio completion.
DM core will indirectly call a DM target's .end_io if it is defined.
In the case of DM linear, there is no need to do so (for every bio that
completes) if CONFIG_DM_ZONED is not enabled.
Avoiding an extra indirect call for every bio completion is very
important for ensuring DM linear doesn't incur more overhead that
further widens the performance gap between dm-linear and raw block
devices.
Fixes: 0be12c1c7fce7 ("dm linear: add support for zoned block devices")
Cc: [email protected]
Signed-off-by: Mike Snitzer <[email protected]>
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Since 'commit 02e389e63e35 ("pinctrl: mcp23s08: fix irq setup order")' the
irq request isn't the last devm_* allocation. Without a deeper look at
the irq and testing this isn't a good solution. Since this driver relies
on the devm mechanism, requesting a interrupt should be the last thing
to avoid memory corruptions during unbinding.
'Commit 02e389e63e35 ("pinctrl: mcp23s08: fix irq setup order")' fixed the
order for the interrupt-controller use case only. The
mcp23s08_irq_setup() must be split into two to fix it for the
interrupt-controller use case and to register the irq at last. So the
irq will be freed first during unbind.
Cc: [email protected]
Cc: Jan Kundrát <[email protected]>
Cc: Dmitry Mastykin <[email protected]>
Cc: Sebastian Reichel <[email protected]>
Fixes: 82039d244f87 ("pinctrl: mcp23s08: add pinconf support")
Fixes: 02e389e63e35 ("pinctrl: mcp23s08: fix irq setup order")
Signed-off-by: Marco Felsch <[email protected]>
Tested-by: Phil Reid <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
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gpiochip_set_cascaded_irqchip() is passed 'parent_irq' as an argument
and then the address of that argument is assigned to the gpio chips
gpio_irq_chip 'parents' pointer shortly thereafter. This can't ever
work, because we've just assigned some stack address to a pointer that
we plan to dereference later in gpiochip_irq_map(). I ran into this
issue with the KASAN report below when gpiochip_irq_map() tried to setup
the parent irq with a total junk pointer for the 'parents' array.
BUG: KASAN: stack-out-of-bounds in gpiochip_irq_map+0x228/0x248
Read of size 4 at addr ffffffc0dde472e0 by task swapper/0/1
CPU: 7 PID: 1 Comm: swapper/0 Not tainted 4.14.72 #34
Call trace:
[<ffffff9008093638>] dump_backtrace+0x0/0x718
[<ffffff9008093da4>] show_stack+0x20/0x2c
[<ffffff90096b9224>] __dump_stack+0x20/0x28
[<ffffff90096b91c8>] dump_stack+0x80/0xbc
[<ffffff900845a350>] print_address_description+0x70/0x238
[<ffffff900845a8e4>] kasan_report+0x1cc/0x260
[<ffffff900845aa14>] __asan_report_load4_noabort+0x2c/0x38
[<ffffff900897e098>] gpiochip_irq_map+0x228/0x248
[<ffffff900820cc08>] irq_domain_associate+0x114/0x2ec
[<ffffff900820d13c>] irq_create_mapping+0x120/0x234
[<ffffff900820da78>] irq_create_fwspec_mapping+0x4c8/0x88c
[<ffffff900820e2d8>] irq_create_of_mapping+0x180/0x210
[<ffffff900917114c>] of_irq_get+0x138/0x198
[<ffffff9008dc70ac>] spi_drv_probe+0x94/0x178
[<ffffff9008ca5168>] driver_probe_device+0x51c/0x824
[<ffffff9008ca6538>] __device_attach_driver+0x148/0x20c
[<ffffff9008ca14cc>] bus_for_each_drv+0x120/0x188
[<ffffff9008ca570c>] __device_attach+0x19c/0x2dc
[<ffffff9008ca586c>] device_initial_probe+0x20/0x2c
[<ffffff9008ca18bc>] bus_probe_device+0x80/0x154
[<ffffff9008c9b9b4>] device_add+0x9b8/0xbdc
[<ffffff9008dc7640>] spi_add_device+0x1b8/0x380
[<ffffff9008dcbaf0>] spi_register_controller+0x111c/0x1378
[<ffffff9008dd6b10>] spi_geni_probe+0x4dc/0x6f8
[<ffffff9008cab058>] platform_drv_probe+0xdc/0x130
[<ffffff9008ca5168>] driver_probe_device+0x51c/0x824
[<ffffff9008ca59cc>] __driver_attach+0x100/0x194
[<ffffff9008ca0ea8>] bus_for_each_dev+0x104/0x16c
[<ffffff9008ca58c0>] driver_attach+0x48/0x54
[<ffffff9008ca1edc>] bus_add_driver+0x274/0x498
[<ffffff9008ca8448>] driver_register+0x1ac/0x230
[<ffffff9008caaf6c>] __platform_driver_register+0xcc/0xdc
[<ffffff9009c4b33c>] spi_geni_driver_init+0x1c/0x24
[<ffffff9008084cb8>] do_one_initcall+0x240/0x3dc
[<ffffff9009c017d0>] kernel_init_freeable+0x378/0x468
[<ffffff90096e8240>] kernel_init+0x14/0x110
[<ffffff9008086fcc>] ret_from_fork+0x10/0x18
The buggy address belongs to the page:
page:ffffffbf037791c0 count:0 mapcount:0 mapping: (null) index:0x0
flags: 0x4000000000000000()
raw: 4000000000000000 0000000000000000 0000000000000000 00000000ffffffff
raw: ffffffbf037791e0 ffffffbf037791e0 0000000000000000 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffffffc0dde47180: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffffffc0dde47200: f1 f1 f1 f1 f8 f8 f8 f8 f8 f8 f8 f8 f8 f8 f2 f2
>ffffffc0dde47280: f2 f2 00 00 00 00 00 00 00 00 00 00 f3 f3 f3 f3
^
ffffffc0dde47300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
ffffffc0dde47380: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Let's leave around one unsigned int in the gpio_irq_chip struct for the
single parent irq case and repoint the 'parents' array at it. This way
code is left mostly intact to setup parents and we waste an extra few
bytes per structure of which there should be only a handful in a system.
Cc: Evan Green <[email protected]>
Cc: Thierry Reding <[email protected]>
Cc: Grygorii Strashko <[email protected]>
Fixes: e0d897289813 ("gpio: Implement tighter IRQ chip integration")
Signed-off-by: Stephen Boyd <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
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When powering down a SDIO connected card during suspend, make sure to call
into the generic lbs_suspend() function before pulling the plug. This will
make sure the card is successfully deregistered from the system to avoid
communication to the card starving out.
Fixes: 7444a8092906 ("libertas: fix suspend and resume for SDIO connected cards")
Signed-off-by: Daniel Mack <[email protected]>
Reviewed-by: Ulf Hansson <[email protected]>
Acked-by: Kalle Valo <[email protected]>
Signed-off-by: Ulf Hansson <[email protected]>
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On systems with OF_IMAP_OLDWORLD_MAC set in of_irq_workarounds, the
devicetree interrupt parsing code is different, causing unit tests of
devicetree interrupt nodes to fail. Due to a bug in unittest code, which
tries to dereference an uninitialized pointer, this results in a crash.
OF: /testcase-data/phandle-tests/consumer-a: arguments longer than property
Unable to handle kernel paging request for data at address 0x00bc616e
Faulting instruction address: 0xc08e9468
Oops: Kernel access of bad area, sig: 11 [#1]
BE PREEMPT PowerMac
Modules linked in:
CPU: 0 PID: 1 Comm: swapper Not tainted 4.14.72-rc1-yocto-standard+ #1
task: cf8e0000 task.stack: cf8da000
NIP: c08e9468 LR: c08ea5bc CTR: c08ea5ac
REGS: cf8dbb50 TRAP: 0300 Not tainted (4.14.72-rc1-yocto-standard+)
MSR: 00001032 <ME,IR,DR,RI> CR: 82004044 XER: 00000000
DAR: 00bc616e DSISR: 40000000
GPR00: c08ea5bc cf8dbc00 cf8e0000 c13ca517 c13ca517 c13ca8a0 00000066 00000002
GPR08: 00000063 00bc614e c0b05865 000affff 82004048 00000000 c00047f0 00000000
GPR16: c0a80000 c0a9cc34 c13ca517 c0ad1134 05ffffff 000affff c0b05860 c0abeef8
GPR24: cecec278 cecec278 c0a8c4d0 c0a885e0 c13ca8a0 05ffffff c13ca8a0 c13ca517
NIP [c08e9468] device_node_gen_full_name+0x30/0x15c
LR [c08ea5bc] device_node_string+0x190/0x3c8
Call Trace:
[cf8dbc00] [c007f670] trace_hardirqs_on_caller+0x118/0x1fc (unreliable)
[cf8dbc40] [c08ea5bc] device_node_string+0x190/0x3c8
[cf8dbcb0] [c08eb794] pointer+0x25c/0x4d0
[cf8dbd00] [c08ebcbc] vsnprintf+0x2b4/0x5ec
[cf8dbd60] [c08ec00c] vscnprintf+0x18/0x48
[cf8dbd70] [c008e268] vprintk_store+0x4c/0x22c
[cf8dbda0] [c008ecac] vprintk_emit+0x94/0x130
[cf8dbdd0] [c008ff54] printk+0x5c/0x6c
[cf8dbe10] [c0b8ddd4] of_unittest+0x2220/0x26f8
[cf8dbea0] [c0004434] do_one_initcall+0x4c/0x184
[cf8dbf00] [c0b4534c] kernel_init_freeable+0x13c/0x1d8
[cf8dbf30] [c0004814] kernel_init+0x24/0x118
[cf8dbf40] [c0013398] ret_from_kernel_thread+0x5c/0x64
The problem was observed when running a qemu test for the g3beige machine
with devicetree unittests enabled.
Disable interrupt node tests on affected systems to avoid both false
unittest failures and the crash.
With this patch in place, unittest on the affected system passes with
the following message.
dt-test ### end of unittest - 144 passed, 0 failed
Fixes: 53a42093d96ef ("of: Add device tree selftests")
Signed-off-by: Guenter Roeck <[email protected]>
Reviewed-by: Frank Rowand <[email protected]>
Signed-off-by: Rob Herring <[email protected]>
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git://git.kernel.org/pub/scm/linux/kernel/git/bleung/chrome-platform
Benson writes:
"chrome-platform fix for v4.19-rc8
This contains a fix to 57e94c8b974d ("mfd: cros-ec: Increase maximum
mkbp event size"), which caused cros_ec based chromebooks to truncate
an entire column of their built-in keyboard."
* tag 'tag-chrome-platform-fixes-for-v4.19-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/bleung/chrome-platform:
mfd: cros-ec: copy the whole event in get_next_event_xfer
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git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu
Dennis writes:
"percpu fixes for-4.19-rc8
The new percpu allocator introduced in 4.14 had a missing free for
the percpu metadata. This caused a memory leak when percpu memory is
being churned resulting in the allocation and deallocation of percpu
memory chunks"
* 'for-4.19-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu:
percpu: stop leaking bitmap metadata blocks
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git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2
Andreas writes:
"gfs2 4.19 fix:
This fixes a regression introduced in commit 64bc06bb32ee "gfs2:
iomap buffered write support""
* tag 'gfs2-4.19.fixes2' of git://git.kernel.org/pub/scm/linux/kernel/git/gfs2/linux-gfs2:
gfs2: Fix iomap buffered write support for journaled files
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git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Martin writes:
"s390 fixes for 4.19-rc8
Four more patches for 4.19:
- Fix resume after suspend-to-disk if resume-CPU != suspend-CPU
- Fix vfio-ccw check for pinned pages
- Two patches to avoid a usercopy-whitelist warning in vfio-ccw"
* tag 's390-4.19-4' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
s390/cio: Fix how vfio-ccw checks pinned pages
s390/cio: Refactor alloc of ccw_io_region
s390/cio: Convert ccw_io_region to pointer
s390/hibernate: fix error handling when suspend cpu != resume cpu
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git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux
Paul writes:
"A few MIPS fixes for 4.19:
- Avoid suboptimal placement of our VDSO when using the legacy mmap
layout, which can prevent statically linked programs that were able
to allocate large amounts of memory using the brk syscall prior to
the introduction of our VDSO from functioning correctly.
- Fix up CONFIG_CMDLINE handling for platforms which ought to ignore
DT arguments but have incorrectly used them & lost other arguments
since v3.16.
- Fix a path in MAINTAINERS to use valid wildcards.
- Fixup a regression from v4.17 in memset() for systems using
CPU_DADDI_WORKAROUNDS."
* tag 'mips_fixes_4.19_2' of git://git.kernel.org/pub/scm/linux/kernel/git/mips/linux:
MIPS: memset: Fix CPU_DADDI_WORKAROUNDS `small_fixup' regression
MAINTAINERS: MIPS/LOONGSON2 ARCHITECTURE - Use the normal wildcard style
MIPS: Fix CONFIG_CMDLINE handling
MIPS: VDSO: Always map near top of user memory
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Commit 57e94c8b974db2d83c60e1139c89a70806abbea0 caused cros-ec keyboard events
be truncated on many chromebooks so that Left and Right keys on Column 12 were
always 0. Use ret as memcpy len to fix this.
The old code was using ec_dev->event_size, which is the event payload/data size
excluding event_type header, for the length of the memcpy operation. Use ret
as memcpy length to avoid the off by one and copy the whole msg->data.
Fixes: 57e94c8b974d ("mfd: cros-ec: Increase maximum mkbp event size")
Acked-by: Enric Balletbo i Serra <[email protected]>
Tested-by: Emil Renner Berthing <[email protected]>
Signed-off-by: Emil Karlson <[email protected]>
Signed-off-by: Benson Leung <[email protected]>
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If dm-linear or dm-flakey are layered on top of a partition of a zoned
block device, remapping of the start sector and write pointer position
of the zones reported by a report zones BIO must be modified to account
for the target table entry mapping (start offset within the device and
entry mapping with the dm device). If the target's backing device is a
partition of a whole disk, the start sector on the physical device of
the partition must also be accounted for when modifying the zone
information. However, dm_remap_zone_report() was not considering this
last case, resulting in incorrect zone information remapping with
targets using disk partitions.
Fix this by calculating the target backing device start sector using
the position of the completed report zones BIO and the unchanged
position and size of the original report zone BIO. With this value
calculated, the start sector and write pointer position of the target
zones can be correctly remapped.
Fixes: 10999307c14e ("dm: introduce dm_remap_zone_report()")
Cc: [email protected]
Signed-off-by: Damien Le Moal <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
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Commit 7e6358d244e47 ("dm: fix various targets to dm_register_target
after module __init resources created") inadvertently introduced this
bug when it moved dm_register_target() after the call to KMEM_CACHE().
Fixes: 7e6358d244e47 ("dm: fix various targets to dm_register_target after module __init resources created")
Cc: [email protected]
Signed-off-by: Shenghui Wang <[email protected]>
Signed-off-by: Mike Snitzer <[email protected]>
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Arthur Kiyanovski says:
====================
minor bug fixes for ENA Ethernet driver
Arthur Kiyanovski (4):
net: ena: fix warning in rmmod caused by double iounmap
net: ena: fix rare bug when failed restart/resume is followed by
driver removal
net: ena: fix NULL dereference due to untimely napi initialization
net: ena: fix auto casting to boolean
====================
Signed-off-by: David S. Miller <[email protected]>
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Eliminate potential auto casting compilation error.
Fixes: 1738cd3ed342 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)")
Signed-off-by: Arthur Kiyanovski <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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napi poll functions should be initialized before running request_irq(),
to handle a rare condition where there is a pending interrupt, causing
the ISR to fire immediately while the poll function wasn't set yet,
causing a NULL dereference.
Fixes: 1738cd3ed342 ("net: ena: Add a driver for Amazon Elastic Network Adapters (ENA)")
Signed-off-by: Arthur Kiyanovski <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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In a rare scenario when ena_device_restore() fails, followed by device
remove, an FLR will not be issued. In this case, the device will keep
sending asynchronous AENQ keep-alive events, even after driver removal,
leading to memory corruption.
Fixes: 8c5c7abdeb2d ("net: ena: add power management ops to the ENA driver")
Signed-off-by: Arthur Kiyanovski <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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Memory mapped with devm_ioremap is automatically freed when the driver
is disconnected from the device. Therefore there is no need to
explicitly call devm_iounmap.
Fixes: 0857d92f71b6 ("net: ena: add missing unmap bars on device removal")
Fixes: 411838e7b41c ("net: ena: fix rare kernel crash when bar memory remap fails")
Signed-off-by: Arthur Kiyanovski <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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Commit 64bc06bb32ee broke buffered writes to journaled files (chattr
+j): we'll try to journal the buffer heads of the page being written to
in gfs2_iomap_journaled_page_done. However, the iomap code no longer
creates buffer heads, so we'll BUG() in gfs2_page_add_databufs. Fix
that by creating buffer heads ourself when needed.
Signed-off-by: Andreas Gruenbacher <[email protected]>
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On some SD cards over SPI, reading with the multiblock read command the last
sector will leave the card in a bad state.
Remove last sectors from the multiblock reading cmd.
Signed-off-by: Chris Boot <[email protected]>
Signed-off-by: Clément Péron <[email protected]>
Cc: [email protected] # v4.10+
Signed-off-by: Ulf Hansson <[email protected]>
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git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc
Vineet writes:
"ARC updates for 4.19-rc8
- Fix clone syscall to update Thread pointer register
- Make/build updates (needed for AGL/OE builds) [Alexey]
- Typo fix [Colin Ian King]"
* tag 'arc-4.19-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc:
ARC: clone syscall to setp r25 as thread pointer
ARC: build: Don't set CROSS_COMPILE in arch's Makefile
ARC: fix spelling mistake "entires" -> "entries"
ARC: build: Get rid of toolchain check
ARCv2: build: use mcpu=hs38 iso generic mcpu=archs
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Arnd Bergmann reported that turning on -Wvla found a new (unintended) VLA usage:
arch/x86/mm/pgtable.c: In function 'pgd_alloc':
include/linux/build_bug.h:29:45: error: ISO C90 forbids variable length array 'u_pmds' [-Werror=vla]
arch/x86/mm/pgtable.c:190:34: note: in expansion of macro 'static_cpu_has'
#define PREALLOCATED_USER_PMDS (static_cpu_has(X86_FEATURE_PTI) ? \
^~~~~~~~~~~~~~
arch/x86/mm/pgtable.c:431:16: note: in expansion of macro 'PREALLOCATED_USER_PMDS'
pmd_t *u_pmds[PREALLOCATED_USER_PMDS];
^~~~~~~~~~~~~~~~~~~~~~
Use the actual size of the array that is used for X86_FEATURE_PTI,
which is known at build time, instead of the variable size.
[ mingo: Squashed original fix with followup fix to avoid bisection breakage, wrote new changelog. ]
Reported-by: Arnd Bergmann <[email protected]>
Original-written-by: Arnd Bergmann <[email protected]>
Reported-by: Borislav Petkov <[email protected]>
Signed-off-by: Kees Cook <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Joerg Roedel <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Toshi Kani <[email protected]>
Fixes: 1be3f247c288 ("x86/mm: Avoid VLA in pgd_alloc()")
Link: http://lkml.kernel.org/r/20181008235434.GA35035@beast
Signed-off-by: Ingo Molnar <[email protected]>
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Remove the leftover pglist_data::numabalancing_migrate_lock and its
initialization, we stopped using this lock with:
efaffc5e40ae ("mm, sched/numa: Remove rate-limiting of automatic NUMA balancing migration")
[ mingo: Rewrote the changelog. ]
Signed-off-by: Srikar Dronamraju <[email protected]>
Acked-by: Mel Gorman <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Linux-MM <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
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While the DOC at the beginning of lib/bitmap.c explicitly states that
"The number of valid bits in a given bitmap does _not_ need to be an
exact multiple of BITS_PER_LONG.", some of the bitmap operations do
indeed access BITS_PER_LONG portions of the provided bitmap no matter
the size of the provided bitmap. For example, if bitmap_intersects()
is provided with an 8 bit bitmap the operation will access
BITS_PER_LONG bits from the provided bitmap. While the operation
ensures that these extra bits do not affect the result, the memory
is still accessed.
The capacity bitmasks (CBMs) are typically stored in u32 since they
can never exceed 32 bits. A few instances exist where a bitmap_*
operation is performed on a CBM by simply pointing the bitmap operation
to the stored u32 value.
The consequence of this pattern is that some bitmap_* operations will
access out-of-bounds memory when interacting with the provided CBM. This
is confirmed with a KASAN test that reports:
BUG: KASAN: stack-out-of-bounds in __bitmap_intersects+0xa2/0x100
and
BUG: KASAN: stack-out-of-bounds in __bitmap_weight+0x58/0x90
Fix this by moving any CBM provided to a bitmap operation needing
BITS_PER_LONG to an 'unsigned long' variable.
[ tglx: Changed related function arguments to unsigned long and got rid
of the _cbm extra step ]
Fixes: 72d505056604 ("x86/intel_rdt: Add utilities to test pseudo-locked region possibility")
Fixes: 49f7b4efa110 ("x86/intel_rdt: Enable setting of exclusive mode")
Fixes: d9b48c86eb38 ("x86/intel_rdt: Display resource groups' allocations' size in bytes")
Fixes: 95f0b77efa57 ("x86/intel_rdt: Initialize new resource group with sane defaults")
Signed-off-by: Reinette Chatre <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Link: https://lkml.kernel.org/r/69a428613a53f10e80594679ac726246020ff94f.1538686926.git.reinette.chatre@intel.com
Signed-off-by: Ingo Molnar <[email protected]>
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The rxrpc_input_packet() function and its call tree was built around the
assumption that data_ready() handler called from UDP to inform a kernel
service that there is data to be had was non-reentrant. This means that
certain locking could be dispensed with.
This, however, turns out not to be the case with a multi-queue network card
that can deliver packets to multiple cpus simultaneously. Each of those
cpus can be in the rxrpc_input_packet() function at the same time.
Fix by adding or changing some structure members:
(1) Add peer->rtt_input_lock to serialise access to the RTT buffer.
(2) Make conn->service_id into a 32-bit variable so that it can be
cmpxchg'd on all arches.
(3) Add call->input_lock to serialise access to the Rx/Tx state. Note
that although the Rx and Tx states are (almost) entirely separate,
there's no point completing the separation and having separate locks
since it's a bi-phasal RPC protocol rather than a bi-direction
streaming protocol. Data transmission and data reception do not take
place simultaneously on any particular call.
and making the following functional changes:
(1) In rxrpc_input_data(), hold call->input_lock around the core to
prevent simultaneous producing of packets into the Rx ring and
updating of tracking state for a particular call.
(2) In rxrpc_input_ping_response(), only read call->ping_serial once, and
check it before checking RXRPC_CALL_PINGING as that's a cheaper test.
The bit test and bit clear can then be combined. No further locking
is needed here.
(3) In rxrpc_input_ack(), take call->input_lock after we've parsed much of
the ACK packet. The superseded ACK check is then done both before and
after the lock is taken.
The handing of ackinfo data is split, parsing before the lock is taken
and processing with it held. This is keyed on rxMTU being non-zero.
Congestion management is also done within the locked section.
(4) In rxrpc_input_ackall(), take call->input_lock around the Tx window
rotation. The ACKALL packet carries no information and is only really
useful after all packets have been transmitted since it's imprecise.
(5) In rxrpc_input_implicit_end_call(), we use rx->incoming_lock to
prevent calls being simultaneously implicitly ended on two cpus and
also to prevent any races with incoming call setup.
(6) In rxrpc_input_packet(), use cmpxchg() to effect the service upgrade
on a connection. It is only permitted to happen once for a
connection.
(7) In rxrpc_new_incoming_call(), we have to recheck the routing inside
rx->incoming_lock to see if someone else set up the call, connection
or peer whilst we were getting there. We can't trust the values from
the earlier routing check unless we pin refs on them - which we want
to avoid.
Further, we need to allow for an incoming call to have its state
changed on another CPU between us making it live and us adjusting it
because the conn is now in the RXRPC_CONN_SERVICE state.
(8) In rxrpc_peer_add_rtt(), take peer->rtt_input_lock around the access
to the RTT buffer. Don't need to lock around setting peer->rtt.
For reference, the inventory of state-accessing or state-altering functions
used by the packet input procedure is:
> rxrpc_input_packet()
* PACKET CHECKING
* ROUTING
> rxrpc_post_packet_to_local()
> rxrpc_find_connection_rcu() - uses RCU
> rxrpc_lookup_peer_rcu() - uses RCU
> rxrpc_find_service_conn_rcu() - uses RCU
> idr_find() - uses RCU
* CONNECTION-LEVEL PROCESSING
- Service upgrade
- Can only happen once per conn
! Changed to use cmpxchg
> rxrpc_post_packet_to_conn()
- Setting conn->hi_serial
- Probably safe not using locks
- Maybe use cmpxchg
* CALL-LEVEL PROCESSING
> Old-call checking
> rxrpc_input_implicit_end_call()
> rxrpc_call_completed()
> rxrpc_queue_call()
! Need to take rx->incoming_lock
> __rxrpc_disconnect_call()
> rxrpc_notify_socket()
> rxrpc_new_incoming_call()
- Uses rx->incoming_lock for the entire process
- Might be able to drop this earlier in favour of the call lock
> rxrpc_incoming_call()
! Conflicts with rxrpc_input_implicit_end_call()
> rxrpc_send_ping()
- Don't need locks to check rtt state
> rxrpc_propose_ACK
* PACKET DISTRIBUTION
> rxrpc_input_call_packet()
> rxrpc_input_data()
* QUEUE DATA PACKET ON CALL
> rxrpc_reduce_call_timer()
- Uses timer_reduce()
! Needs call->input_lock()
> rxrpc_receiving_reply()
! Needs locking around ack state
> rxrpc_rotate_tx_window()
> rxrpc_end_tx_phase()
> rxrpc_proto_abort()
> rxrpc_input_dup_data()
- Fills the Rx buffer
- rxrpc_propose_ACK()
- rxrpc_notify_socket()
> rxrpc_input_ack()
* APPLY ACK PACKET TO CALL AND DISCARD PACKET
> rxrpc_input_ping_response()
- Probably doesn't need any extra locking
! Need READ_ONCE() on call->ping_serial
> rxrpc_input_check_for_lost_ack()
- Takes call->lock to consult Tx buffer
> rxrpc_peer_add_rtt()
! Needs to take a lock (peer->rtt_input_lock)
! Could perhaps manage with cmpxchg() and xadd() instead
> rxrpc_input_requested_ack
- Consults Tx buffer
! Probably needs a lock
> rxrpc_peer_add_rtt()
> rxrpc_propose_ack()
> rxrpc_input_ackinfo()
- Changes call->tx_winsize
! Use cmpxchg to handle change
! Should perhaps track serial number
- Uses peer->lock to record MTU specification changes
> rxrpc_proto_abort()
! Need to take call->input_lock
> rxrpc_rotate_tx_window()
> rxrpc_end_tx_phase()
> rxrpc_input_soft_acks()
- Consults the Tx buffer
> rxrpc_congestion_management()
- Modifies the Tx annotations
! Needs call->input_lock()
> rxrpc_queue_call()
> rxrpc_input_abort()
* APPLY ABORT PACKET TO CALL AND DISCARD PACKET
> rxrpc_set_call_completion()
> rxrpc_notify_socket()
> rxrpc_input_ackall()
* APPLY ACKALL PACKET TO CALL AND DISCARD PACKET
! Need to take call->input_lock
> rxrpc_rotate_tx_window()
> rxrpc_end_tx_phase()
> rxrpc_reject_packet()
There are some functions used by the above that queue the packet, after
which the procedure is terminated:
- rxrpc_post_packet_to_local()
- local->event_queue is an sk_buff_head
- local->processor is a work_struct
- rxrpc_post_packet_to_conn()
- conn->rx_queue is an sk_buff_head
- conn->processor is a work_struct
- rxrpc_reject_packet()
- local->reject_queue is an sk_buff_head
- local->processor is a work_struct
And some that offload processing to process context:
- rxrpc_notify_socket()
- Uses RCU lock
- Uses call->notify_lock to call call->notify_rx
- Uses call->recvmsg_lock to queue recvmsg side
- rxrpc_queue_call()
- call->processor is a work_struct
- rxrpc_propose_ACK()
- Uses call->lock to wrap __rxrpc_propose_ACK()
And a bunch that complete a call, all of which use call->state_lock to
protect the call state:
- rxrpc_call_completed()
- rxrpc_set_call_completion()
- rxrpc_abort_call()
- rxrpc_proto_abort()
- Also uses rxrpc_queue_call()
Fixes: 17926a79320a ("[AF_RXRPC]: Provide secure RxRPC sockets for use by userspace and kernel both")
Signed-off-by: David Howells <[email protected]>
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Fix the rxrpc_tx_packet trace line by storing the where parameter.
Fixes: 4764c0da69dc ("rxrpc: Trace packet transmission")
Signed-off-by: David Howells <[email protected]>
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Fix connection-level abort handling to cache the abort and error codes
properly so that a new incoming call can be properly aborted if it races
with the parent connection being aborted by another CPU.
The abort_code and error parameters can then be dropped from
rxrpc_abort_calls().
Fixes: f5c17aaeb2ae ("rxrpc: Calls should only have one terminal state")
Signed-off-by: David Howells <[email protected]>
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Move the out-of-order and duplicate ACK packet check to before the call to
rxrpc_input_ackinfo() so that the receive window size and MTU size are only
checked in the latest ACK packet and don't regress.
Fixes: 248f219cb8bc ("rxrpc: Rewrite the data and ack handling code")
Signed-off-by: David Howells <[email protected]>
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Carry the call state out of the locked section in rxrpc_rotate_tx_window()
rather than sampling it afterwards. This is only used to select tracepoint
data, but could have changed by the time we do the tracepoint.
Signed-off-by: David Howells <[email protected]>
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We should only call the function to end a call's Tx phase if we rotated the
marked-last packet out of the transmission buffer.
Make rxrpc_rotate_tx_window() return an indication of whether it just
rotated the packet marked as the last out of the transmit buffer, carrying
the information out of the locked section in that function.
We can then check the return value instead of examining RXRPC_CALL_TX_LAST.
Fixes: 70790dbe3f66 ("rxrpc: Pass the last Tx packet marker in the annotation buffer")
Signed-off-by: David Howells <[email protected]>
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We don't need to take the RCU read lock in the rxrpc packet receive
function because it's held further up the stack in the IP input routine
around the UDP receive routines.
Fix this by dropping the RCU read lock calls from rxrpc_input_packet().
This simplifies the code.
Fixes: 70790dbe3f66 ("rxrpc: Pass the last Tx packet marker in the annotation buffer")
Signed-off-by: David Howells <[email protected]>
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Use the UDP encap_rcv hook to cut the bit out of the rxrpc packet reception
in which a packet is placed onto the UDP receive queue and then immediately
removed again by rxrpc. Going via the queue in this manner seems like it
should be unnecessary.
This does, however, require the invention of a value to place in encap_type
as that's one of the conditions to switch packets out to the encap_rcv
hook. Possibly the value doesn't actually matter for anything other than
sockopts on the UDP socket, which aren't accessible outside of rxrpc
anyway.
This seems to cut a bit of time out of the time elapsed between each
sk_buff being timestamped and turning up in rxrpc (the final number in the
following trace excerpts). I measured this by making the rxrpc_rx_packet
trace point print the time elapsed between the skb being timestamped and
the current time (in ns), e.g.:
... 424.278721: rxrpc_rx_packet: ... ACK 25026
So doing a 512MiB DIO read from my test server, with an unmodified kernel:
N min max sum mean stddev
27605 2626 7581 7.83992e+07 2840.04 181.029
and with the patch applied:
N min max sum mean stddev
27547 1895 12165 6.77461e+07 2459.29 255.02
Signed-off-by: David Howells <[email protected]>
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David writes:
"Sparc fixes:
1) Minor fallthru comment tweaks from Gustavo A. R. Silva.
2) VLA removal from Kees Cook.
3) Make sparc vdso Makefile match x86, from Masahiro Yamada.
4) Fix clock divider programming in mach64 driver, from Mikulas
Patocka."
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc:
sparc64: fix fall-through annotation
sparc32: fix fall-through annotation
sparc: vdso: clean-up vdso Makefile
oradax: remove redundant null check before kfree
sparc64: viohs: Remove VLA usage
sbus: Use of_get_child_by_name helper
sparc: Convert to using %pOFn instead of device_node.name
mach64: detect the dot clock divider correctly on sparc
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If the current process has unlimited RLIMIT_MEMLOCK,
we should should leave it as is.
Fixes: 941ff6f11c02 ("bpf: fix rlimit in reuseport net selftest")
Signed-off-by: John Sperbeck <[email protected]>
Signed-off-by: Eric Dumazet <[email protected]>
Acked-by: Daniel Borkmann <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>
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git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/vfio-ccw into fixes
Pull vfio-ccw from Cornelia Huck with the following changes:
- Another fix for vfio-ccw: make sure it accesses the correct entries
in the pfn_array_table arrays when checking pinned pages.
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runtime refcount fix for mst connectors.
Signed-off-by: Dave Airlie <[email protected]>
From: Ben Skeggs <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/CABDvA=nydWjs26=TZHqistLXjCwm-vHmrisbP6K=FMZ5gW1wnQ@mail.gmail.com
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Replace "fallthru" with a proper "fall through" annotation.
This fix is part of the ongoing efforts to enabling
-Wimplicit-fallthrough
Signed-off-by: Gustavo A. R. Silva <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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Replace "fallthru" with a proper "fall through" annotation.
This fix is part of the ongoing efforts to enabling
-Wimplicit-fallthrough
Signed-off-by: Gustavo A. R. Silva <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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arch/sparc/vdso/Makefile is a replica of arch/x86/entry/vdso/Makefile.
Clean-up the Makefile in the same way as I did for x86:
- Remove unnecessary export
- Put the generated linker script to $(obj)/ instead of $(src)/
- Simplify cmd_vdso2c
The corresponding x86 commits are:
- 61615faf0a89 ("x86/build/vdso: Remove unnecessary export in Makefile")
- 1742ed2088cc ("x86/build/vdso: Put generated linker scripts to $(obj)/")
- c5fcdbf15523 ("x86/build/vdso: Simplify 'cmd_vdso2c'")
Signed-off-by: Masahiro Yamada <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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A null check before a kfree is redundant, so remove it.
Signed-off-by: Colin Ian King <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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In the quest to remove all stack VLA usage from the kernel[1], this
allocates a fixed size array for the maximum number of cookies and
adds a runtime sanity check.
[1] https://lkml.kernel.org/r/CA+55aFzCG-zNmZwX4A2FQpadafLfEzK6CC=qPXydAacU1
[email protected]
Signed-off-by: Kees Cook <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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Use the of_get_child_by_name() helper instead of open coding searching
for the '/options' node. This removes directly accessing the name
pointer as well.
Cc: "David S. Miller" <[email protected]>
Cc: [email protected]
Signed-off-by: Rob Herring <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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In preparation to remove the node name pointer from struct device_node,
convert printf users to use the %pOFn format specifier.
Cc: "David S. Miller" <[email protected]>
Cc: [email protected]
Signed-off-by: Rob Herring <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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On Sun Ultra 5, it happens that the dot clock is not set up properly for
some videomodes. For example, if we set the videomode "r1024x768x60" in
the firmware, Linux would incorrectly set a videomode with refresh rate
180Hz when booting (suprisingly, my LCD monitor can display it, although
display quality is very low).
The reason is this: Older mach64 cards set the divider in the register
VCLK_POST_DIV. The register has four 2-bit fields (the field that is
actually used is specified in the lowest two bits of the register
CLOCK_CNTL). The 2 bits select divider "1, 2, 4, 8". On newer mach64 cards,
there's another bit added - the top four bits of PLL_EXT_CNTL extend the
divider selection, so we have possible dividers "1, 2, 4, 8, 3, 5, 6, 12".
The Linux driver clears the top four bits of PLL_EXT_CNTL and never sets
them, so it can work regardless if the card supports them. However, the
sparc64 firmware may set these extended dividers during boot - and the
mach64 driver detects incorrect dot clock in this case.
This patch makes the driver read the additional divider bit from
PLL_EXT_CNTL and calculate the initial refresh rate properly.
Signed-off-by: Mikulas Patocka <[email protected]>
Cc: [email protected]
Acked-by: David S. Miller <[email protected]>
Reviewed-by: Ville Syrjälä <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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Eugene Syromiatnikov says:
====================
net/smc: userspace breakage fixes
These two patches correct some userspace-affecting issues introduced
during 4.19 development cycle, specifically:
* New structure "struct smcd_diag_dmbinfo" has been defined in a way
that would lead to different layout of the structure on most 32-bit
ABIs in comparison with layout on 64-bit ABIs;
* One of the commits renamed an UAPI-exposed field name.
Changes since v1:
* Managed not to forget to add --cover-letter.
* Commit ID format in commit message has been changed in accordance
with Sergei Shtylyov's recommendations.
====================
Signed-off-by: David S. Miller <[email protected]>
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Commit c601171d7a60 ("net/smc: provide smc mode in smc_diag.c") changed
the name of diag_fallback field of struct smc_diag_msg structure
to diag_mode. However, this structure is a part of UAPI, and this change
breaks user space applications that use it ([1], for example). Since
the new name is more suitable, convert the field to a union that provides
access to the data via both the new and the old name.
[1] https://gitlab.com/strace/strace/blob/v4.24/netlink_smc_diag.c#L165
Fixes: c601171d7a60 ("net/smc: provide smc mode in smc_diag.c")
Signed-off-by: Eugene Syromiatnikov <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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Commit 4b1b7d3b30a6 ("net/smc: add SMC-D diag support") introduced
new UAPI-exposed structure, struct smcd_diag_dmbinfo. However,
it's not usable by compat binaries, as it has different layout there.
Probably, the most straightforward fix that will avoid similar issues
in the future is to use __aligned_u64 for 64-bit fields.
Fixes: 4b1b7d3b30a6 ("net/smc: add SMC-D diag support")
Signed-off-by: Eugene Syromiatnikov <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
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