These changes are for patch_instruction() uses on data. Unlike ppc64
these should not be incorrect as-is, but using the patch_uint() alias
better reflects what kind of data being patched and allows for
benchmarking the effect of different patch_* implementations (e.g.,
skipping instruction
This use of patch_instruction() is working on 32 bit data, and can fail
if the data looks like a prefixed instruction and the extra write
crosses a page boundary. Use patch_u32() to fix the write size.
Fixes: 8734b41b3efe ("powerpc/module_64: Fix livepatching for RO modules")
Link:
patch_instruction() is designed for patching instructions in otherwise
readonly memory. Other consumers also sometimes need to patch readonly
memory, so have abused patch_instruction() for arbitrary data patches.
This is a problem on ppc64 as patch_instruction() decides on the patch
width using
Currently patch_instruction() bases the write length on the value being
written. If the value looks like a prefixed instruction it writes 8 bytes,
otherwise it writes 4 bytes. This makes it potentially buggy to use for
writing arbitrary data, as if you want to write 4 bytes but it decides to
write
allnoconfig gcc
arc allyesconfig gcc
arc defconfig gcc
arc randconfig-001-20231015 gcc
arm allmodconfig gcc
arm
allnoconfig gcc
arc allyesconfig gcc
arc defconfig gcc
arc randconfig-001-20231015 gcc
arm allmodconfig gcc
arm
The pull request you sent on Sun, 15 Oct 2023 21:31:39 +1100:
> https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git
> tags/powerpc-6.6-4
has been merged into torvalds/linux.git:
https://git.kernel.org/torvalds/c/f8bf101b3b1171923a011a47923a93f4b22e6cb0
Thank you!
--
-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256
Hi Linus,
Please pull some more powerpc fixes for 6.6:
The following changes since commit 58b33e78a31782ffe25d404d5eba9a45fe636e27:
selftests/powerpc: Fix emit_tests to work with run_kselftest.sh (2023-09-22
20:29:48 +1000)
are available in
On Mon, 18 Sep 2023 17:56:09 +, Peter Lafreniere wrote:
> ReiserFS has been considered deprecated for 19 months since commit
> eb103a51640e ("reiserfs: Deprecate reiserfs"). However, there are
> several architectures that still build it into their defconfig kernels.
>
> As ReiserFS will be
On Fri, 25 Aug 2023 15:27:54 +0100, li...@treblig.org wrote:
> PowerPC has a 'btext' font used for the console which is almost identical
> to the shared font_sun8x16, so use it rather than duplicating the data.
>
> They were actually identical until about a decade ago when
>commit
On Mon, 18 Sep 2023 12:14:42 +0200, Geert Uytterhoeven wrote:
> Note that the "COPYING" file at that time corresponded to the version
> from upstream Linux v0.99.11 until v2.1.104, and thus predated the
> addition of the "only valid GPL version is v2" clause in v2.4.0-test8.
>
> This patch series
On Fri, 22 Sep 2023 14:33:13 +0200, Christophe Leroy wrote:
> Clang 17 reports:
>
> arch/powerpc/kernel/traps.c:1167:19: error: unused function '__parse_fpscr'
> [-Werror,-Wunused-function]
>
> __parse_fpscr() is called from two sites. First call is guarded
> by #ifdef CONFIG_PPC_FPU_REGS
>
>
On Thu, 21 Sep 2023 17:26:10 +1000, Michael Ellerman wrote:
> In order to use run_kselftest.sh the list of tests must be emitted to
> populate kselftest-list.txt.
>
> The powerpc Makefile is written to use EMIT_TESTS. But support for
> EMIT_TESTS was dropped in commit d4e59a536f50 ("selftests:
On Thu, 24 Aug 2023 22:28:49 +1000, Michael Ellerman wrote:
> Christophe reported that the change to ARCH_FORCE_MAX_ORDER to limit the
> range to 10 had broken his ability to configure hugepages:
>
> # echo 1 > /sys/kernel/mm/hugepages/hugepages-8192kB/nr_hugepages
> sh: write error: Invalid
On Tue, 10 Oct 2023 22:47:50 +1100, Michael Ellerman wrote:
> Eddie reported that newer kernels were crashing during boot on his 476
> FSP2 system:
>
> kernel tried to execute user page (b7ee2000) - exploit attempt? (uid: 0)
> BUG: Unable to handle kernel instruction fetch
> Faulting
On Mon, 25 Sep 2023 20:31:14 +0200, Christophe Leroy wrote:
> This series reworks _PAGE_FLAGS on all platforms in order
> to implement execute-only protection on all powerpc.
>
> For all targets except 40x and 604 it will be a real execute-only
> protection as the hardware and/or software allows
On Fri, 29 Sep 2023 22:53:36 +0530, Athira Rajeev wrote:
> In powerpc pseries system, below behaviour is observed while
> enabling tracing on hcall:
> # cd /sys/kernel/debug/tracing/
> # cat events/powerpc/hcall_exit/enable
> 0
> # echo 1 > events/powerpc/hcall_exit/enable
On Mon, 25 Sep 2023 17:55:51 +0200, Christophe Leroy wrote:
> Booting mpc85xx_defconfig kernel on QEMU leads to:
>
> Bad trap at PC: fe9bab0, SR: 2d000, vector=800
> awk[82]: unhandled trap (5) at 0 nip fe9bab0 lr fe9e01c code 5 in
> libc-2.27.so[fe5a000+17a000]
> awk[82]: code: 3aa0
On Fri, 22 Sep 2023 09:24:41 +1000, Michael Ellerman wrote:
> The changes to copy_thread() made in commit eed7c420aac7 ("powerpc:
> copy_thread differentiate kthreads and user mode threads") inadvertently
> broke arch_stack_walk_reliable() because it has knowledge of the stack
> layout.
>
> Fix
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