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Itanium (IA64) is going away, so drop it from the kernel feature
documentation.
Signed-off-by: Ard Biesheuvel <[email protected]>
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1/8 of kernel addresses reserved for shadow memory. But for LoongArch,
There are a lot of holes between different segments and valid address
space (256T available) is insufficient to map all these segments to kasan
shadow memory with the common formula provided by kasan core, saying
(addr >> KASAN_SHADOW_SCALE_SHIFT) + KASAN_SHADOW_OFFSET
So LoongArch has a arch-specific mapping formula, different segments are
mapped individually, and only limited space lengths of these specific
segments are mapped to shadow.
At early boot stage the whole shadow region populated with just one
physical page (kasan_early_shadow_page). Later, this page is reused as
readonly zero shadow for some memory that kasan currently don't track.
After mapping the physical memory, pages for shadow memory are allocated
and mapped.
Functions like memset()/memcpy()/memmove() do a lot of memory accesses.
If bad pointer passed to one of these function it is important to be
caught. Compiler's instrumentation cannot do this since these functions
are written in assembly.
KASan replaces memory functions with manually instrumented variants.
Original functions declared as weak symbols so strong definitions in
mm/kasan/kasan.c could replace them. Original functions have aliases
with '__' prefix in names, so we could call non-instrumented variant
if needed.
Signed-off-by: Qing Zhang <[email protected]>
Signed-off-by: Huacai Chen <[email protected]>
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The official arch name is LoongArch [1], we should use small letter
loongarch instead of loong in Documentation/features, just use the
features-refresh.sh to refresh all the related files.
[1] https://www.kernel.org/doc/html/latest/loongarch/index.html
Fixes: 5860800e8696 ("Documentation/features: Update the arch support status files")
Signed-off-by: Tiezhu Yang <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jonathan Corbet <[email protected]>
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Run the refresh script to document the recent feature additions
on loong, um and csky as of v6.1-rc7.
Signed-off-by: Wei Li <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jonathan Corbet <[email protected]>
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The arch support status files don't match reality as of v5.19-rc1,
use the features-refresh.sh to refresh all the arch-support.txt files
in place. The main effect is to add entries for the new loong
architecture.
Signed-off-by: Zheng Zengkai <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jonathan Corbet <[email protected]>
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asm-generic
* 'remove-h8300' of git://git.infradead.org/users/hch/misc:
remove the h8300 architecture
This is clearly the least actively maintained architecture we have at
the moment, and probably the least useful. It is now the only one that
does not support MMUs at all, and most of the boards only support 4MB
of RAM, out of which the defconfig kernel needs more than half just
for .text/.data.
Guenter Roeck did the original patch to remove the architecture in 2013
after it had already been obsolete for a while, and Yoshinori Sato brought
it back in a much more modern form in 2015. Looking at the git history
since the reinstantiation, it's clear that almost all commits in the tree
are build fixes or cross-architecture cleanups:
$ git log --no-merges --format=%an v4.5.. arch/h8300/ | sort | uniq
-c | sort -rn | head -n 12
25 Masahiro Yamada
18 Christoph Hellwig
14 Mike Rapoport
9 Arnd Bergmann
8 Mark Rutland
7 Peter Zijlstra
6 Kees Cook
6 Ingo Molnar
6 Al Viro
5 Randy Dunlap
4 Yury Norov
Signed-off-by: Arnd Bergmann <[email protected]>
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The nds32 architecture, also known as AndeStar V3, is a custom 32-bit
RISC target designed by Andes Technologies. Support was added to the
kernel in 2016 as the replacement RISC-V based V5 processors were
already announced, and maintained by (current or former) Andes
employees.
As explained by Alan Kao, new customers are now all using RISC-V,
and all known nds32 users are already on longterm stable kernels
provided by Andes, with no development work going into mainline
support any more.
While the port is still in a reasonably good shape, it only gets
worse over time without active maintainers, so it seems best
to remove it before it becomes unusable. As always, if it turns
out that there are mainline users after all, and they volunteer
to maintain the port in the future, the removal can be reverted.
Link: https://lore.kernel.org/linux-mm/[email protected]/
Link: https://lore.kernel.org/lkml/[email protected]/
Link: https://www.andestech.com/en/products-solutions/andestar-architecture/
Signed-off-by: Alan Kao <[email protected]>
[arnd: rewrite changelog to provide more background]
Signed-off-by: Arnd Bergmann <[email protected]>
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Signed-off-by: Christoph Hellwig <[email protected]>
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The references to arch/c6x are obsolete now that the architecture
is gone. Remove them.
Signed-off-by: Arnd Bergmann <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jonathan Corbet <[email protected]>
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This patch enables the kernel address sanitizer for ARM. XIP_KERNEL
has not been tested and is therefore not allowed for now.
Cc: Andrey Ryabinin <[email protected]>
Cc: Alexander Potapenko <[email protected]>
Cc: Dmitry Vyukov <[email protected]>
Cc: [email protected]
Acked-by: Dmitry Vyukov <[email protected]>
Reviewed-by: Ard Biesheuvel <[email protected]>
Tested-by: Ard Biesheuvel <[email protected]> # QEMU/KVM/mach-virt/LPAE/8G
Tested-by: Florian Fainelli <[email protected]> # Brahma SoCs
Tested-by: Ahmad Fatoum <[email protected]> # i.MX6Q
Signed-off-by: Abbott Liu <[email protected]>
Signed-off-by: Florian Fainelli <[email protected]>
Signed-off-by: Linus Walleij <[email protected]>
Signed-off-by: Russell King <[email protected]>
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The unicore32 port do not seem maintained for a long time now, there is no
upstream toolchain that can create unicore32 binaries and all the links to
prebuilt toolchains for unicore32 are dead. Even compilers that were
available are not supported by the kernel anymore.
Guenter Roeck says:
I have stopped building unicore32 images since v4.19 since there is no
available compiler that is still supported by the kernel. I am surprised
that support for it has not been removed from the kernel.
Remove unicore32 port.
Signed-off-by: Mike Rapoport <[email protected]>
Acked-by: Arnd Bergmann <[email protected]>
Acked-by: Guenter Roeck <[email protected]>
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I was manually editing the arch-support.txt for eBPF-JIT, when I
realized the refresh script [1] has not been run for a while. Let's
fix that, so that the entries are more up-to-date.
[1] Documentation/features/scripts/features-refresh.sh
Signed-off-by: Björn Töpel <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jonathan Corbet <[email protected]>
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core/ cBPF-JIT : TODO |
core/ eBPF-JIT : TODO |
core/ generic-idle-thread : ok |
core/ jump-labels : TODO |
core/ tracehook : ok |
debug/ KASAN : TODO |
debug/ gcov-profile-all : TODO |
debug/ kgdb : TODO |
debug/ kprobes-on-ftrace : TODO |
debug/ kprobes : TODO |
debug/ kretprobes : TODO |
debug/ optprobes : TODO |
debug/ stackprotector : TODO |
debug/ uprobes : TODO |
debug/ user-ret-profiler : TODO |
io/ dma-contiguous : ok |
locking/ cmpxchg-local : TODO |
locking/ lockdep : TODO |
locking/ queued-rwlocks : ok |
locking/ queued-spinlocks : TODO |
locking/ rwsem-optimized : TODO |
perf/ kprobes-event : TODO |
perf/ perf-regs : TODO |
perf/ perf-stackdump : TODO |
sched/ membarrier-sync-core : TODO |
sched/ numa-balancing : .. |
seccomp/ seccomp-filter : TODO |
time/ arch-tick-broadcast : TODO |
time/ clockevents : ok |
time/ context-tracking : TODO |
time/ irq-time-acct : TODO |
time/ modern-timekeeping : ok |
time/ virt-cpuacct : TODO |
vm/ ELF-ASLR : TODO |
vm/ PG_uncached : TODO |
vm/ THP : .. |
vm/ batch-unmap-tlb-flush: TODO |
vm/ huge-vmap : TODO |
vm/ ioremap_prot : TODO |
vm/ numa-memblock : .. |
vm/ pte_special : TODO |
Signed-off-by: Guo Ren <[email protected]>
Cc: Arnd Bergmann <[email protected]>
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Now that the script 'features-refresh.sh' is available, uses this script
to refresh all the arch-support.txt files in place.
Signed-off-by: Andrea Parri <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Andrew Morton <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>
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A number of architecture ports are obsolete and getting dropped,
so we no longer want to track the respective features.
We already removed the lines for metag and mn10300, this does
the same edits for all the others.
For the remaining 21 architectures, this shows how many are known
to implement each given feature:
19 time/modern-timekeeping/arch-support.txt
19 time/clockevents/arch-support.txt
15 core/tracehook/arch-support.txt
14 core/generic-idle-thread/arch-support.txt
13 locking/lockdep/arch-support.txt
12 io/dma-api-debug/arch-support.txt
11 debug/kgdb/arch-support.txt
10 time/virt-cpuacct/arch-support.txt
9 debug/kretprobes/arch-support.txt
9 debug/kprobes/arch-support.txt
8 vm/THP/arch-support.txt
8 vm/pte_special/arch-support.txt
8 vm/numa-memblock/arch-support.txt
8 io/sg-chain/arch-support.txt
7 perf/kprobes-event/arch-support.txt
7 locking/rwsem-optimized/arch-support.txt
7 debug/gcov-profile-all/arch-support.txt
7 core/jump-labels/arch-support.txt
7 core/BPF-JIT/arch-support.txt
6 vm/ELF-ASLR/arch-support.txt
6 time/context-tracking/arch-support.txt
6 seccomp/seccomp-filter/arch-support.txt
6 debug/stackprotector/arch-support.txt
5 time/irq-time-acct/arch-support.txt
5 io/dma-contiguous/arch-support.txt
5 debug/uprobes/arch-support.txt
4 vm/ioremap_prot/arch-support.txt
4 time/arch-tick-broadcast/arch-support.txt
4 perf/perf-stackdump/arch-support.txt
4 perf/perf-regs/arch-support.txt
3 debug/KASAN/arch-support.txt
2 vm/PG_uncached/arch-support.txt
2 vm/huge-vmap/arch-support.txt
2 sched/numa-balancing/arch-support.txt
2 sched/membarrier-sync-core/arch-support.txt
2 locking/cmpxchg-local/arch-support.txt
2 debug/optprobes/arch-support.txt
2 debug/kprobes-on-ftrace/arch-support.txt
1 vm/TLB/arch-support.txt
1 locking/queued-spinlocks/arch-support.txt
1 locking/queued-rwlocks/arch-support.txt
1 debug/user-ret-profiler/arch-support.txt
0 lib/strncasecmp/arch-support.txt
Note that the list does not include riscv or nds32 yet, these still
need to be added.
Signed-off-by: Arnd Bergmann <[email protected]>
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Remove the MN10300 arch as the hardware is defunct.
Suggested-by: Arnd Bergmann <[email protected]>
Signed-off-by: David Howells <[email protected]>
cc: Masahiro Yamada <[email protected]>
cc: [email protected]
Signed-off-by: Arnd Bergmann <[email protected]>
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Remove any remaining references to the Meta architecture in
Documentation/, primarily from Documentation/features/.
Signed-off-by: James Hogan <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: [email protected]
Cc: [email protected]
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Pull Xtensa updates from Max Filippov:
- add SSP support
- add KASAN support
- improvements to xtensa-specific assembly:
- use ENTRY and ENDPROC consistently
- clean up and unify word alignment macros
- clean up and unify fixup marking
- use 'call' instead of 'callx' where possible
- various cleanups:
- consiolidate kernel stack size related definitions
- replace #ifdef'fed/commented out debug printk statements with
pr_debug
- use struct exc_table instead of flat array for exception handling
data
- build kernel with -mtext-section-literals; simplify xtensa linker
script
- fix futex_atomic_cmpxchg_inatomic()
* tag 'xtensa-20180129' of git://github.com/jcmvbkbc/linux-xtensa: (21 commits)
xtensa: fix futex_atomic_cmpxchg_inatomic
xtensa: shut up gcc-8 warnings
xtensa: print kernel sections info in mem_init
xtensa: use generic strncpy_from_user with KASAN
xtensa: use __memset in __xtensa_clear_user
xtensa: add support for KASAN
xtensa: move fixmap and kmap just above the KSEG
xtensa: don't clear swapper_pg_dir in paging_init
xtensa: extract init_kio
xtensa: implement early_trap_init
xtensa: clean up exception handling structure
xtensa: clean up custom-controlled debug output
xtensa: enable stack protector
xtensa: print hardware config ID on startup
xtensa: consolidate kernel stack size related definitions
xtensa: clean up functions in assembly code
xtensa: clean up word alignment macros in assembly code
xtensa: clean up fixups in assembly code
xtensa: use call instead of callx in assembly code
xtensa: build kernel with text-section-literals
...
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Cover kernel addresses above 0x90000000 by the shadow map. Enable
HAVE_ARCH_KASAN when MMU is enabled. Provide kasan_early_init that fills
shadow map with writable copies of kasan_zero_page. Call
kasan_early_init right after mmu initialization in the setup_arch.
Provide kasan_init that allocates proper shadow map pages from the
memblock and puts these pages into the shadow map for addresses from
VMALLOC area to the end of KSEG. Call kasan_init right after memblock
initialization. Don't use KASAN for the boot code, MMU and KASAN
initialization and page fault handler. Make kernel stack size 4 times
larger when KASAN is enabled to avoid stack overflows.
GCC 7.3, 8 or newer is required to build the xtensa kernel with KASAN.
Signed-off-by: Max Filippov <[email protected]>
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Relevant part is:
arch/x86/Kconfig: select HAVE_ARCH_KASAN if X86_64 && SPARSEMEM_VMEMMAP
Signed-off-by: Adam Borowski <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>
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The AVR32 architecture support has been removed from the Linux kernel,
hence remove all references to it from Documentation.
Signed-off-by: Hans-Christian Noren Egtvedt <[email protected]>
Signed-off-by: Håvard Skinnemoen <[email protected]>
Signed-off-by: Nicolas Ferre <[email protected]>
Acked-by: Andy Shevchenko <[email protected]>
Acked-by: Boris Brezillon <[email protected]>
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Signed-off-by: Andrey Ryabinin <[email protected]>
Signed-off-by: Catalin Marinas <[email protected]>
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status file for 'KASAN'
Cc: <[email protected]>
Cc: <[email protected]>
Cc: <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: Jonathan Corbet <[email protected]>
Cc: Josh Triplett <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
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