Re: [PATCH v11 09/13] powerpc: disable KASAN instrumentation on early/critical files.

[Christophe Leroy]

Le 26/04/2019 Ã 18:23, Christophe Leroy a ÃcritÂ:
> All files containing functions run before kasan_early_init() is called
> must have KASAN instrumentation disabled.
>
> For those file, branch profiling also have to be disabled otherwise
> each if () generates a call to ftrace_likely_update().
>
> Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxx>
> ---
>   arch/powerpc/kernel/Makefile             | 12 ++++++++++++
>   arch/powerpc/lib/Makefile                |  8 ++++++++
>   arch/powerpc/mm/Makefile                 |  6 ++++++
>   arch/powerpc/platforms/powermac/Makefile |  6 ++++++
>   arch/powerpc/purgatory/Makefile          |  3 +++
>   arch/powerpc/xmon/Makefile               |  1 +
>   6 files changed, 36 insertions(+)

[...]

> diff --git a/arch/powerpc/mm/Makefile b/arch/powerpc/mm/Makefile
> index 3c1bd9fa23cd..dd945ca869b2 100644
> --- a/arch/powerpc/mm/Makefile
> +++ b/arch/powerpc/mm/Makefile
> @@ -7,6 +7,12 @@ ccflags-$(CONFIG_PPC64)	:= $(NO_MINIMAL_TOC)
>   
>   CFLAGS_REMOVE_slb.o = $(CC_FLAGS_FTRACE)
>   
> +KASAN_SANITIZE_ppc_mmu_32.o := n
> +
> +ifdef CONFIG_KASAN
> +CFLAGS_ppc_mmu_32.o  		+= -DDISABLE_BRANCH_PROFILING
> +endif
> +

The above is missing in powerpc/next (should now be in 
arch/powerpc/mm/book3s32/Makefile )

Christophe