[PATCH v4 7/7] powerpc: kcsan: Add KCSAN Support

[Christophe Leroy]

Le 08/02/2023 à 04:22, 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.

Copy/pasted from v3 ?

In v4 PPC32 is supported as well.

> 
> See documentation in Documentation/dev-tools/kcsan.rst for more
> information.
> 
> Signed-off-by: Rohan McLure <rmclure at linux.ibm.com>
> ---
> v3: Restrict support to 64-bit, as TSAN expects 64-bit __atomic_* compiler
> built-ins.
> ---
>   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

That if PPC64 should go away as we now have the builtins.

>   	select HAVE_ARCH_KFENCE			if ARCH_SUPPORTS_DEBUG_PAGEALLOC
>   	select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
>   	select HAVE_ARCH_KGDB