[PATCH 2/2] powerpc/{32,book3e}: kcsan: Extend KCSAN Support

[Rohan McLure]

> On 16 Feb 2023, at 6:14 pm, Christophe Leroy <christophe.leroy at csgroup.eu> wrote:
> 
> 
> 
> Le 16/02/2023 à 06:09, 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.
>> 
>> Boots and passes selftests on 32-bit and 64-bit platforms. See
>> documentation in Documentation/dev-tools/kcsan.rst for more information.
>> 
>> Signed-off-by: Rohan McLure <rmclure at linux.ibm.com>
>> ---
>> New patch
>> ---
>>  arch/powerpc/Kconfig | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>> 
>> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
>> index 2c9cdf1d8761..45771448d47a 100644
>> --- a/arch/powerpc/Kconfig
>> +++ b/arch/powerpc/Kconfig
>> @@ -197,7 +197,7 @@ 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 PPC_BOOK3S_64
>> + select HAVE_ARCH_KCSAN
> 
> So that's a followup of a not yet posted version v5 of the other series ?
> Why not just add patch 1 in that series and have KCSAN for all powerpc 
> at once ?

So the v3 was accepted upstream, likely to appear in 6.3. This patch series is
just to extend support to other platforms, once kcsan supports us.

Link: https://patchwork.ozlabs.org/project/linuxppc-dev/cover/20230206021801.105268-1-rmclure@linux.ibm.com/

> 
>>   select HAVE_ARCH_KFENCE if ARCH_SUPPORTS_DEBUG_PAGEALLOC
>>   select HAVE_ARCH_RANDOMIZE_KSTACK_OFFSET
>>   select HAVE_ARCH_KGDB