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    SubjectRe: [PATCH mm v3 28/38] kasan, page_alloc: allow skipping memory init for HW_TAGS
    On Tue, Dec 14, 2021 at 7:00 PM Marco Elver <elver@google.com> wrote:
    >
    > On Mon, Dec 13, 2021 at 10:54PM +0100, andrey.konovalov@linux.dev wrote:
    > > From: Andrey Konovalov <andreyknvl@google.com>
    > >
    > > Add a new GFP flag __GFP_SKIP_ZERO that allows to skip memory
    > > initialization. The flag is only effective with HW_TAGS KASAN.
    > [...]
    > > - * is being zeroed (either via __GFP_ZERO or via init_on_alloc).
    > > + * is being zeroed (either via __GFP_ZERO or via init_on_alloc, provided that
    > > + * __GFP_SKIP_ZERO is not set).
    > > + *
    > > + * %__GFP_SKIP_ZERO makes page_alloc skip zeroing memory.
    > > + * Only effective when HW_TAGS KASAN is enabled.
    > > *
    > > * %__GFP_SKIP_KASAN_UNPOISON makes KASAN skip unpoisoning on page allocation.
    > > * Only effective in HW_TAGS mode.
    > > @@ -242,6 +247,7 @@ struct vm_area_struct;
    > > #define __GFP_COMP ((__force gfp_t)___GFP_COMP)
    > > #define __GFP_ZERO ((__force gfp_t)___GFP_ZERO)
    > > #define __GFP_ZEROTAGS ((__force gfp_t)___GFP_ZEROTAGS)
    > > +#define __GFP_SKIP_ZERO ((__force gfp_t)___GFP_SKIP_ZERO)
    > > #define __GFP_SKIP_KASAN_UNPOISON ((__force gfp_t)___GFP_SKIP_KASAN_UNPOISON)
    > > #define __GFP_SKIP_KASAN_POISON ((__force gfp_t)___GFP_SKIP_KASAN_POISON)
    > >
    > > @@ -249,7 +255,7 @@ struct vm_area_struct;
    > > #define __GFP_NOLOCKDEP ((__force gfp_t)___GFP_NOLOCKDEP)
    > >
    > > /* Room for N __GFP_FOO bits */
    > > -#define __GFP_BITS_SHIFT (26 + IS_ENABLED(CONFIG_LOCKDEP))
    > > +#define __GFP_BITS_SHIFT (27 + IS_ENABLED(CONFIG_LOCKDEP))
    >
    > You're adding several new flags, I think you should also make a
    > corresponding change to include/trace/events/mmflags.h?
    >
    > At least __GFP_SKIP_KASAN_POISON is currently in there.

    Indeed, will fix in v4. Thanks!

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