Re: [PATCH v3 1/3] kasan, arm64: use ARCH_SLAB_MINALIGN instead of manual aligning

[Andrey Konovalov]

On Wed, Jan 9, 2019 at 11:10 AM Vincenzo Frascino
<vincenzo.frascino@xxxxxxx> wrote:
>
> On 03/01/2019 18:45, Andrey Konovalov wrote:
> > Instead of changing cache->align to be aligned to KASAN_SHADOW_SCALE_SIZE
> > in kasan_cache_create() we can reuse the ARCH_SLAB_MINALIGN macro.
> >
> > Suggested-by: Vincenzo Frascino <vincenzo.frascino@xxxxxxx>
> > Signed-off-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
> > ---
> >  arch/arm64/include/asm/cache.h | 6 ++++++
> >  mm/kasan/common.c              | 2 --
> >  2 files changed, 6 insertions(+), 2 deletions(-)
> >
> > diff --git a/arch/arm64/include/asm/cache.h b/arch/arm64/include/asm/cache.h
> > index 13dd42c3ad4e..eb43e09c1980 100644
> > --- a/arch/arm64/include/asm/cache.h
> > +++ b/arch/arm64/include/asm/cache.h
> > @@ -58,6 +58,12 @@
> >   */
> >  #define ARCH_DMA_MINALIGN    (128)
> >
> > +#ifdef CONFIG_KASAN_SW_TAGS
> > +#define ARCH_SLAB_MINALIGN   (1ULL << KASAN_SHADOW_SCALE_SHIFT)
> > +#else
> > +#define ARCH_SLAB_MINALIGN   __alignof__(unsigned long long)
> > +#endif
> > +
>
> Could you please remove the "#else" case here, because it is redundant (it is
> defined in linux/slab.h as ifndef) and could be misleading in future?

Sure, sent a patch. Thanks!

>
> >  #ifndef __ASSEMBLY__
> >
> >  #include <linux/bitops.h>
> > diff --git a/mm/kasan/common.c b/mm/kasan/common.c
> > index 03d5d1374ca7..44390392d4c9 100644
> > --- a/mm/kasan/common.c
> > +++ b/mm/kasan/common.c
> > @@ -298,8 +298,6 @@ void kasan_cache_create(struct kmem_cache *cache, unsigned int *size,
> >               return;
> >       }
> >
> > -     cache->align = round_up(cache->align, KASAN_SHADOW_SCALE_SIZE);
> > -
> >       *flags |= SLAB_KASAN;
> >  }
> >
> >
>
> --
> Regards,
> Vincenzo
>
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