[PATCH 3/4] powerpc: Add -Wvla to arch CFLAGS

[Michael Ellerman]

Kees Cook <keescook at chromium.org> writes:
> On Tue, Oct 9, 2018 at 10:13 PM, Michael Ellerman <mpe at ellerman.id.au> wrote:
>> Upstream has declared that Variable Length Array's (VLAs) are a bad
>> idea, and eventually -Wvla will be added to the top-level Makefile. We
>> can go one better and make sure we don't introduce any more by adding
>> it to the arch Makefile.
>>
>> Signed-off-by: Michael Ellerman <mpe at ellerman.id.au>
>> ---
>>  arch/powerpc/Kbuild | 3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/powerpc/Kbuild b/arch/powerpc/Kbuild
>> index 1625a06802ca..86b261d6bde5 100644
>> --- a/arch/powerpc/Kbuild
>> +++ b/arch/powerpc/Kbuild
>> @@ -1,4 +1,5 @@
>> -subdir-ccflags-$(CONFIG_PPC_WERROR) := -Werror
>> +subdir-ccflags-y := $(call cc-option, -Wvla)
>> +subdir-ccflags-$(CONFIG_PPC_WERROR) += -Werror
>>
>>  obj-y += kernel/
>>  obj-y += mm/
>
> -Wvla will be going into the top-level Makefile in the merge window
> (see linux-next), so this will be redundant.

Thanks, yeah I saw that after I posted. Will drop this one.

cheers