Re: [PATCH v2] arm64: Fix warning in mte_get_random_tag()

[Catalin Marinas]

On Thu, Feb 11, 2021 at 03:22:08PM +0000, Vincenzo Frascino wrote:
> The simplification of mte_get_random_tag() caused the introduction of the
> warning below:
> 
> In file included from arch/arm64/include/asm/kasan.h:9,
>                  from include/linux/kasan.h:16,
>                  from mm/kasan/common.c:14:
> mm/kasan/common.c: In function ‘mte_get_random_tag’:
> arch/arm64/include/asm/mte-kasan.h:45:9: warning: ‘addr’ is used
>                                          uninitialized [-Wuninitialized]
>    45 |         asm(__MTE_PREAMBLE "irg %0, %0"
>       |
> 
> Fix the warning using "=r" for the address in the asm inline.
> 
> Fixes: c8f8de4c0887 ("arm64: kasan: simplify and inline MTE functions")
> Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
> Cc: Will Deacon <will@xxxxxxxxxx>
> Cc: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
> Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@xxxxxxx>

Acked-by: Catalin Marinas <catalin.marinas@xxxxxxx>