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... and now we finally can sort out the mess in _copy_mc_to_iter().
Provide a variant of iterate_and_advance() that does *NOT* ignore
the return values of bvec, xarray and kvec callbacks, use that in
_copy_mc_to_iter(). That gets rid of magic in those callbacks -
we used to need it so we'd get at least the right return value in
case of failure halfway through.
As a bonus, now iterator is advanced by the amount actually copied
for all flavours. That's what the callers expect and it used to do that
correctly in iovec and xarray cases. However, in kvec and bvec cases
the iterator had not been advanced on such failures, breaking the users.
Fixed now...
Signed-off-by: Al Viro <[email protected]>
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... incidentally, using pointer instead of index in an array
(the only change here) trims half-kilobyte of .text...
Signed-off-by: Al Viro <[email protected]>
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The differences between iterate_iovec and iterate_kvec are minor:
* kvec callback is treated as if it returned 0
* initialization of __p is with i->iov and i->kvec resp.
which is trivially dealt with.
No code generation changes - compiler is quite capable of turning
left = ((void)(STEP), 0);
__v.iov_len -= left;
(with no accesses to left downstream) and
(void)(STEP);
into the same code.
Signed-off-by: Al Viro <[email protected]>
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iterate_bvec
Premature optimization is the root of all evil... Trying
to unroll the first pass through the loop makes it harder
to follow and not just for readers - compiler ends up
generating worse code than it would on a "non-optimized"
loop.
Signed-off-by: Al Viro <[email protected]>
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iov_iter_advance() needs to do some non-trivial work when it's given
0 as argument (skip all empty iovecs, mostly). We used to implement
it via iterate_and_advance(); we no longer do so and for all other
users of iterate_and_advance() zero length is a no-op.
Signed-off-by: Al Viro <[email protected]>
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Namely, have off counted starting from 0 rather than from csstate->off.
To compensate we need to shift the initial value (csstate->sum) (rotate
by 8 bits, as usual for csum) and do the same after we are finished adding
the pieces up.
What we get out of that is a bit more redundancy in our variables - from
is always equal to addr + off, which will be useful several commits down
the road.
Signed-off-by: Al Viro <[email protected]>
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variant
Replacement is called copy_page_from_iter_atomic(); unlike the old primitive the
callers do *not* need to do iov_iter_advance() after it. In case when they end
up consuming less than they'd been given they need to do iov_iter_revert() on
everything they had not consumed. That, however, needs to be done only on slow
paths.
All in-tree callers converted. And that kills the last user of iterate_all_kinds()
Signed-off-by: Al Viro <[email protected]>
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Compiler is capable of recognizing division by power of 2 and turning
it into shifts.
Signed-off-by: Al Viro <[email protected]>
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note that in bvec case pages can be compound ones - we can't just assume
that each segment is covered by one (sub)page
Signed-off-by: Al Viro <[email protected]>
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iov_iter_get_pages()/iov_iter_get_pages_alloc()
Here iterate_all_kinds() is used just to find the first (non-empty, in
case of iovec) segment. Which can be easily done explicitly.
Note that in bvec case we now can get more than PAGE_SIZE worth of them,
in case when we have a compound page in bvec and a range that crosses
a subpage boundary. Older behaviour had been to stop on that boundary;
we used to get the right first page (for_each_bvec() took care of that),
but that was all we'd got.
Signed-off-by: Al Viro <[email protected]>
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For one thing, it's only used for iovec (and makes sense only for those).
For another, here we don't care about iov_offset, since the beginning of
the first segment and the end of the last one are ignored. So it makes
a lot more sense to just walk through the iovec array...
We need to deal with the case of truncated iov_iter, but unlike the
situation with iov_iter_alignment() we don't care where the last
segment ends - just which segment is the last one.
[fixed a braino spotted by Qian Cai <[email protected]>]
Signed-off-by: Al Viro <[email protected]>
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It's easier to go over the array manually. We need to watch out
for truncated iov_iter, though - iovec array might cover more
than i->count.
Signed-off-by: Al Viro <[email protected]>
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1) constify iov_iter argument; we are not advancing it in this primitive.
2) cap the amount requested by the amount of data in iov_iter. All
existing callers should've been safe, but the check is really cheap and
doing it here makes for easier analysis, as well as more consistent
semantics among the primitives.
3) don't bother with iterate_iovec(). Explicit loop is not any harder
to follow, and we get rid of standalone iterate_iovec() users - it's
only used by iterate_and_advance() and (soon to be gone) iterate_all_kinds().
Signed-off-by: Al Viro <[email protected]>
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We can do better than generic iterate_and_advance() for this one;
inspired by bvec_iter_advance() (and massaged into that form by
equivalent transformations).
[fixed a braino caught by kernel test robot <[email protected]>]
Signed-off-by: Al Viro <[email protected]>
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Instead of having them mixed in iter->type, use separate ->iter_type
and ->data_source (u8 and bool resp.) And don't bother with (pseudo-)
bitmap for the former - microoptimizations from being able to check
if the flavour is one of two values are not worth the confusion for
optimizer. It can't prove that we never get e.g. ITER_IOVEC | ITER_PIPE,
so we end up with extra headache.
Signed-off-by: Al Viro <[email protected]>
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the field is not used for that flavour
Signed-off-by: Al Viro <[email protected]>
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iovec is the most common one; test it first and test explicitly,
rather than "not anything else". Replace all flavour checks with
use of iov_iter_is_...() helpers.
Signed-off-by: Al Viro <[email protected]>
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Use corresponding plain variants, revert on short copy. That's the way it
should've been done from the very beginning, except that we didn't have
iov_iter_revert() back then...
[fixed another braino caught by Qian Cai <[email protected]>]
Signed-off-by: Al Viro <[email protected]>
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Fix W=1 kernel build warning:
lib/crc64.c:40: warning:
bad line: or the previous crc64 value if computing incrementally.
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: YueHaibing <[email protected]>
Reviewed-by: Coly Li <[email protected]>
Acked-by: Randy Dunlap <[email protected]>
Tested-by: Randy Dunlap <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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Signed-off-by: Ingo Molnar <[email protected]>
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asking to advance by more than we have left in the iov_iter should
move to the very end; it should *not* leave negative i->count and
it should not spew into syslog, etc. - it's a legitimate operation.
Signed-off-by: Al Viro <[email protected]>
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... and actually should just check it's given an iovec-backed iterator
in the first place.
Cc: [email protected]
Signed-off-by: Al Viro <[email protected]>
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we need to advance the iterator...
Cc: [email protected]
Signed-off-by: Al Viro <[email protected]>
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In situation when copy_page_to_iter() got a compound page the current
code would only work on systems with no CONFIG_HIGHMEM. It *is* the majority
of real-world setups, or we would've drown in bug reports by now. Still needs
fixing.
Current variant works for solitary page; rename that to
__copy_page_to_iter() and turn the handling of compound pages into a loop over
subpages.
Cc: [email protected]
Signed-off-by: Al Viro <[email protected]>
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Remove iov_iter_for_each_range() as it's no longer used with the removal of
lustre.
Signed-off-by: David Howells <[email protected]>
Signed-off-by: Al Viro <[email protected]>
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Some arches (um, sparc64, riscv, xtensa) cause a Kconfig warning for
LOCKDEP.
These arch-es select LOCKDEP_SUPPORT but they are not listed as one
of the arch-es that LOCKDEP depends on.
Since (16) arch-es define the Kconfig symbol LOCKDEP_SUPPORT if they
intend to have LOCKDEP support, replace the awkward list of
arch-es that LOCKDEP depends on with the LOCKDEP_SUPPORT symbol.
But wait. LOCKDEP_SUPPORT is included in LOCK_DEBUGGING_SUPPORT,
which is already a dependency here, so LOCKDEP_SUPPORT is redundant
and not needed.
That leaves the FRAME_POINTER dependency, but it is part of an
expression like this:
depends on (A && B) && (FRAME_POINTER || B')
where B' is a dependency of B so if B is true then B' is true
and the value of FRAME_POINTER does not matter.
Thus we can also delete the FRAME_POINTER dependency.
Fixes this kconfig warning: (for um, sparc64, riscv, xtensa)
WARNING: unmet direct dependencies detected for LOCKDEP
Depends on [n]: DEBUG_KERNEL [=y] && LOCK_DEBUGGING_SUPPORT [=y] && (FRAME_POINTER [=n] || MIPS || PPC || S390 || MICROBLAZE || ARM || ARC || X86)
Selected by [y]:
- PROVE_LOCKING [=y] && DEBUG_KERNEL [=y] && LOCK_DEBUGGING_SUPPORT [=y]
- LOCK_STAT [=y] && DEBUG_KERNEL [=y] && LOCK_DEBUGGING_SUPPORT [=y]
- DEBUG_LOCK_ALLOC [=y] && DEBUG_KERNEL [=y] && LOCK_DEBUGGING_SUPPORT [=y]
Fixes: 7d37cb2c912d ("lib: fix kconfig dependency on ARCH_WANT_FRAME_POINTERS")
Signed-off-by: Randy Dunlap <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Acked-by: Waiman Long <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
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We need the driver core fixes in here as well.
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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We need the char/misc fixes in here as well.
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu
Pull percpu fixes from Dennis Zhou:
"This contains a cleanup to lib/percpu-refcount.c and an update to the
MAINTAINERS file to more formally take over support for lib/percpu*"
* 'for-5.13-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/dennis/percpu:
MAINTAINERS: Add lib/percpu* as part of percpu entry
percpu_ref: Don't opencode percpu_ref_is_dying
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sparse was producing warnings of the form:
sparse: cast truncates bits from constant value (ffff0001 becomes 1)
There is no actual problem here. Using type_min() on an unsigned type
results in an (expected) truncation.
However, there is no need to test an unsigned value against type_min().
The minimum value of an unsigned is obviously 0, and any value cast to
an unsigned type is >= 0, so for unsigneds only type_max() need be tested.
This patch also takes the opportunity to clean up the implementation of
simple_numbers_loop() to use a common pattern for the positive and
negative test.
Reported-by: kernel test robot <[email protected]>
Signed-off-by: Richard Fitzgerald <[email protected]>
Reviewed-by: Petr Mladek <[email protected]>
Signed-off-by: Petr Mladek <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
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If booted with verbose>=1, dyndbg prints the memory usage in bytes,
of builtin modules' prdebugs. KiB reads better.
no functional changes.
Signed-off-by: Jim Cromie <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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We'd like all architectures to convert to ARCH_ATOMIC, as this will
enable functionality, and once all architectures are converted it will
be possible to make significant cleanups to the atomic headers.
A number of architectures use asm-generic/atomic64.h, and it's
impractical to convert the header and all these architectures in one go.
To make it possible to convert them one-by-one, let's make the
asm-generic implementation function as either atomic64_*() or
arch_atomic64_*() depending on whether ARCH_ATOMIC is selected. To do
this, the generic implementations are prefixed as generic_atomic64_*(),
and preprocessor definitions map atomic64_*()/arch_atomic64_*() onto
these as appropriate.
Once all users are moved over to ARCH_ATOMIC the ifdeffery in the header
can be simplified and/or removed entirely.
For existing users (none of which select ARCH_ATOMIC), there should be
no functional change as a result of this patch.
Signed-off-by: Mark Rutland <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Boqun Feng <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Will Deacon <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
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Commit 09c60546f04f ("./Makefile: add debug option to enable
function aligned on 32 bytes") was introduced to help debugging
strange kernel performance changes caused by code alignment
change.
Recently we found 2 similar cases [1][2] caused by code-alignment
changes, which can only be identified by forcing 64 bytes aligned
for all functions.
Originally, 32 bytes was used mainly for not wasting too much
text space, but this option is only for debug anyway where text
space is not a big concern. So extend the alignment to 64 bytes
to cover more similar cases.
[1].https://lore.kernel.org/lkml/20210427090013.GG32408@xsang-OptiPlex-9020/
[2].https://lore.kernel.org/lkml/20210420030837.GB31773@xsang-OptiPlex-9020/
Signed-off-by: Feng Tang <[email protected]>
Signed-off-by: Masahiro Yamada <[email protected]>
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lib/bitfield_kunit.c: In function `test_bitfields_constants':
lib/bitfield_kunit.c:93:1: warning: the frame size of 7456 bytes is larger than 2048 bytes [-Wframe-larger-than=]
}
^
As the description of BITFIELD_KUNIT in lib/Kconfig.debug, it "Only useful
for kernel devs running the KUnit test harness, and not intended for
inclusion into a production build". Therefore, it is not worth modifying
variable 'test_bitfields_constants' to clear this warning. Just suppress
it.
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Zhen Lei <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: Vitor Massaru Iha <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc
Pull char/misc driver fixes from Greg KH:
"Here is a big set of char/misc/other driver fixes for 5.13-rc3.
The majority here is the fallout of the umn.edu re-review of all prior
submissions. That resulted in a bunch of reverts along with the
"correct" changes made, such that there is no regression of any of the
potential fixes that were made by those individuals. I would like to
thank the over 80 different developers who helped with the review and
fixes for this mess.
Other than that, there's a few habanna driver fixes for reported
issues, and some dyndbg fixes for reported problems.
All of these have been in linux-next for a while with no reported
problems"
* tag 'char-misc-5.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (82 commits)
misc: eeprom: at24: check suspend status before disable regulator
uio_hv_generic: Fix another memory leak in error handling paths
uio_hv_generic: Fix a memory leak in error handling paths
uio/uio_pci_generic: fix return value changed in refactoring
Revert "Revert "ALSA: usx2y: Fix potential NULL pointer dereference""
dyndbg: drop uninformative vpr_info
dyndbg: avoid calling dyndbg_emit_prefix when it has no work
binder: Return EFAULT if we fail BINDER_ENABLE_ONEWAY_SPAM_DETECTION
cdrom: gdrom: initialize global variable at init time
brcmfmac: properly check for bus register errors
Revert "brcmfmac: add a check for the status of usb_register"
video: imsttfb: check for ioremap() failures
Revert "video: imsttfb: fix potential NULL pointer dereferences"
net: liquidio: Add missing null pointer checks
Revert "net: liquidio: fix a NULL pointer dereference"
media: gspca: properly check for errors in po1030_probe()
Revert "media: gspca: Check the return value of write_bridge for timeout"
media: gspca: mt9m111: Check write_bridge for timeout
Revert "media: gspca: mt9m111: Check write_bridge for timeout"
media: dvb: Add check on sp8870_readreg return
...
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Adds test_sscanf to test various number conversion cases, as
number conversion was previously broken.
This also tests the simple_strtoxxx() functions exported from
vsprintf.c.
Signed-off-by: Richard Fitzgerald <[email protected]>
Acked-by: Andy Shevchenko <[email protected]>
Signed-off-by: Petr Mladek <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
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The existing code attempted to handle numbers by doing a strto[u]l(),
ignoring the field width, and then repeatedly dividing to extract the
field out of the full converted value. If the string contains a run of
valid digits longer than will fit in a long or long long, this would
overflow and no amount of dividing can recover the correct value.
This patch fixes vsscanf() to obey number field widths when parsing
the number.
A new _parse_integer_limit() is added that takes a limit for the number
of characters to parse. The number field conversion in vsscanf is changed
to use this new function.
If a number starts with a radix prefix, the field width must be long
enough for at last one digit after the prefix. If not, it will be handled
like this:
sscanf("0x4", "%1i", &i): i=0, scanning continues with the 'x'
sscanf("0x4", "%2i", &i): i=0, scanning continues with the '4'
This is consistent with the observed behaviour of userland sscanf.
Note that this patch does NOT fix the problem of a single field value
overflowing the target type. So for example:
sscanf("123456789abcdef", "%x", &i);
Will not produce the correct result because the value obviously overflows
INT_MAX. But sscanf will report a successful conversion.
Note that where a very large number is used to mean "unlimited", the value
INT_MAX is used for consistency with the behaviour of vsnprintf().
Signed-off-by: Richard Fitzgerald <[email protected]>
Reviewed-by: Petr Mladek <[email protected]>
Signed-off-by: Petr Mladek <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
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If a signed number field starts with a '-' the field width must be > 1,
or unlimited, to allow at least one digit after the '-'.
This patch adds a check for this. If a signed field starts with '-'
and field_width == 1 the scanf will quit.
It is ok for a signed number field to have a field width of 1 if it
starts with a digit. In that case the single digit can be converted.
Signed-off-by: Richard Fitzgerald <[email protected]>
Reviewed-by: Petr Mladek <[email protected]>
Acked-by: Andy Shevchenko <[email protected]>
Signed-off-by: Petr Mladek <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
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is_percpu_thread() more elegantly handles SMP vs UP, and further checks the
presence of PF_NO_SETAFFINITY. This lets us catch cases where
check_preemption_disabled() can race with a concurrent sched_setaffinity().
Signed-off-by: Yejune Deng <[email protected]>
[Amended changelog]
Signed-off-by: Valentin Schneider <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
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ISO 8601 defines 'T' as a separator between date and time. Though,
some ABIs use time and date with ' ' (space) separator instead.
Add a flavour to the %pt specifier to override default separator.
Signed-off-by: Andy Shevchenko <[email protected]>
Reviewed-by: Petr Mladek <[email protected]>
Reviewed-by: Sergey Senozhatsky <[email protected]>
Signed-off-by: Petr Mladek <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
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We need the driver core fixes in here as well.
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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These tests deliberately access these arrays out of bounds, which will
cause the dynamic local bounds checks inserted by
CONFIG_UBSAN_LOCAL_BOUNDS to fail and panic the kernel. To avoid this
problem, access the arrays via volatile pointers, which will prevent the
compiler from being able to determine the array bounds.
These accesses use volatile pointers to char (char *volatile) rather than
the more conventional pointers to volatile char (volatile char *) because
we want to prevent the compiler from making inferences about the pointer
itself (i.e. its array bounds), not the data that it refers to.
Link: https://lkml.kernel.org/r/[email protected]
Link: https://linux-review.googlesource.com/id/I90b1713fbfa1bf68ff895aef099ea77b98a7c3b9
Signed-off-by: Peter Collingbourne <[email protected]>
Tested-by: Alexander Potapenko <[email protected]>
Reviewed-by: Andrey Konovalov <[email protected]>
Cc: Peter Collingbourne <[email protected]>
Cc: George Popescu <[email protected]>
Cc: Elena Petrova <[email protected]>
Cc: Evgenii Stepanov <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
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Ensure that all error handling branches print error information. In this
way, when this function fails, the upper-layer functions can directly
return an error code without missing debugging information. Otherwise,
the error message will be printed redundantly or missing.
Reviewed-by: Vladimir Oltean <[email protected]>
Signed-off-by: Zhen Lei <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Remove a vpr_info which I added in 2012, when I knew even less than now.
In 2020, a simpler pr_fmt stripped it of context, and any remaining value.
no functional change.
Signed-off-by: Jim Cromie <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Wrap function in a static-inline one, which checks flags to avoid
calling the function unnecessarily.
And hoist its output-buffer initialization to the grand-caller, which
is already allocating the buffer on the stack, and can trivially
initialize it too.
Signed-off-by: Jim Cromie <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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With commit 312c004d36ce ("[PATCH] driver core: replace "hotplug" by
"uevent"") already in the tree over a decade, update the name of
FW_ACTION defines to follow semantics, and reflect what the defines are
really meant for, i.e. whether or not generate user space event.
Acked-by: Lee Jones <[email protected]>
Signed-off-by: Shawn Guo <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
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Signed-off-by: Nikolay Borisov <[email protected]>
Signed-off-by: Dennis Zhou <[email protected]>
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Currently the bitmap_remap() and bitmap_bitremap() are available
only for CONFIG_NUMA=y case, while some users may benefit out of it
and being independent to NUMA code. Make them available to users
by moving out of ifdeffery and exporting for modules.
Signed-off-by: Andy Shevchenko <[email protected]>
Tested-by: Neeli Srinivas <[email protected]>
Acked-by: Yury Norov <[email protected]>
Signed-off-by: Bartosz Golaszewski <[email protected]>
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RCU code supports an 'all' group as a special case when parsing rcu_nocbs
parameter. This patch moves the 'all' support to the core bitmap_parse
code, so that all bitmap users can enjoy this extension.
Moving 'all' parsing to a bitmap_parse level also allows users to pass
patterns together with 'all' in regular group:pattern format, for example,
"rcu_nocbs=all:1/2" would offload all the even-numbered CPUs regardless
of the number of CPUs on the system.
Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Yury Norov <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>
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git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild
Pull more Kbuild updates from Masahiro Yamada:
- Convert sh and sparc to use generic shell scripts to generate the
syscall headers
- refactor .gitignore files
- Update kernel/config_data.gz only when the content of the .config
is really changed, which avoids the unneeded re-link of vmlinux
- move "remove stale files" workarounds to scripts/remove-stale-files
- suppress unused-but-set-variable warnings by default for Clang
as well
- fix locale setting LANG=C to LC_ALL=C
- improve 'make distclean'
- always keep intermediate objects from scripts/link-vmlinux.sh
- move IF_ENABLED out of <linux/kconfig.h> to make it self-contained
- misc cleanups
* tag 'kbuild-v5.13-2' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (25 commits)
linux/kconfig.h: replace IF_ENABLED() with PTR_IF() in <linux/kernel.h>
kbuild: Don't remove link-vmlinux temporary files on exit/signal
kbuild: remove the unneeded comments for external module builds
kbuild: make distclean remove tag files in sub-directories
kbuild: make distclean work against $(objtree) instead of $(srctree)
kbuild: refactor modname-multi by using suffix-search
kbuild: refactor fdtoverlay rule
kbuild: parameterize the .o part of suffix-search
arch: use cross_compiling to check whether it is a cross build or not
kbuild: remove ARCH=sh64 support from top Makefile
.gitignore: prefix local generated files with a slash
kbuild: replace LANG=C with LC_ALL=C
Makefile: Move -Wno-unused-but-set-variable out of GCC only block
kbuild: add a script to remove stale generated files
kbuild: update config_data.gz only when the content of .config is changed
.gitignore: ignore only top-level modules.builtin
.gitignore: move tags and TAGS close to other tag files
kernel/.gitgnore: remove stale timeconst.h and hz.bc
usr/include: refactor .gitignore
genksyms: fix stale comment
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