Le 06/02/2023 à 03:18, Rohan McLure a écrit :
> Enable HAVE_ARCH_KCSAN on all powerpc platforms, permitting use of the
> kernel concurrency sanitiser through the CONFIG_KCSAN_* kconfig options.
> KCSAN requires compiler builtins __atomic_* 64-bit values, and so only
> report support on PPC64.
>
> See documentation in Documentation/dev-tools/kcsan.rst for more
> information.
>
> Signed-off-by: Rohan McLure <rmcl...@linux.ibm.com>
> ---
> v3: Restrict support to 64-bit, as TSAN expects 64-bit __atomic_* compiler
> built-ins.
Support for PPC32 should be kept.
See commit 725aea873261 ("xtensa: enable KCSAN")
xtensa is a 32 bits architecture, they have implemented stubs for 64-bit
atomics.
Maybe those stubs should be made generic by moving them into
kernel/kcsan/ and building them for all 32 bit architectures.
Christophe
> ---
> arch/powerpc/Kconfig | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index b8c4ac56bddc..55bc2d724c73 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -198,6 +198,7 @@ config PPC
> select HAVE_ARCH_KASAN if PPC_RADIX_MMU
> select HAVE_ARCH_KASAN if PPC_BOOK3E_64
> select HAVE_ARCH_KASAN_VMALLOC if HAVE_ARCH_KASAN
> + select HAVE_ARCH_KCSAN if PPC64
> select HAVE_ARCH_KFENCE if ARCH_SUPPORTS_DEBUG_PAGEALLOC
> select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
> select HAVE_ARCH_KGDB
