| Message ID | 92f3029f3647ab355450ed5c8252bad8cfae1e09.1640036051.git.andreyknvl@google.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | kasan, vmalloc, arm64: add vmalloc tagging support for SW/HW_TAGS | expand |
On Mon, Dec 20, 2021 at 10:59 PM <andrey.konovalov@linux.dev> wrote: > > From: Andrey Konovalov <andreyknvl@google.com> Reviewed-by: Alexander Potapenko <glider@google.com> > > __GFP_ZEROTAGS is intended as an optimization: if memory is zeroed during > allocation, it's possible to set memory tags at the same time with little > performance impact. Perhaps you could mention this intention explicitly in the comment? Right now it still doesn't reference performance. > > Clarify this intention of __GFP_ZEROTAGS in the comment. > > Signed-off-by: Andrey Konovalov <andreyknvl@google.com> > --- > include/linux/gfp.h | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/include/linux/gfp.h b/include/linux/gfp.h > index 0b2d2a636164..d6a184523ca2 100644 > --- a/include/linux/gfp.h > +++ b/include/linux/gfp.h > @@ -228,8 +228,8 @@ struct vm_area_struct; > * > * %__GFP_ZERO returns a zeroed page on success. > * > - * %__GFP_ZEROTAGS returns a page with zeroed memory tags on success, if > - * __GFP_ZERO is set. > + * %__GFP_ZEROTAGS zeroes memory tags at allocation time if the memory itself > + * is being zeroed (either via __GFP_ZERO or via init_on_alloc). > * > * %__GFP_SKIP_KASAN_POISON returns a page which does not need to be poisoned > * on deallocation. Typically used for userspace pages. Currently only has an > -- > 2.25.1 > > -- > You received this message because you are subscribed to the Google Groups "kasan-dev" group. > To unsubscribe from this group and stop receiving emails from it, send an email to kasan-dev+unsubscribe@googlegroups.com. > To view this discussion on the web visit https://groups.google.com/d/msgid/kasan-dev/92f3029f3647ab355450ed5c8252bad8cfae1e09.1640036051.git.andreyknvl%40google.com.
On Tue, Dec 21, 2021 at 10:17 AM Alexander Potapenko <glider@google.com> wrote: > > On Mon, Dec 20, 2021 at 10:59 PM <andrey.konovalov@linux.dev> wrote: > > > > From: Andrey Konovalov <andreyknvl@google.com> > > Reviewed-by: Alexander Potapenko <glider@google.com> > > > > > __GFP_ZEROTAGS is intended as an optimization: if memory is zeroed during > > allocation, it's possible to set memory tags at the same time with little > > performance impact. > Perhaps you could mention this intention explicitly in the comment? > Right now it still doesn't reference performance. Sure, will do in v5. Thanks!
diff --git a/include/linux/gfp.h b/include/linux/gfp.h index 0b2d2a636164..d6a184523ca2 100644 --- a/include/linux/gfp.h +++ b/include/linux/gfp.h @@ -228,8 +228,8 @@ struct vm_area_struct; * * %__GFP_ZERO returns a zeroed page on success. * - * %__GFP_ZEROTAGS returns a page with zeroed memory tags on success, if - * __GFP_ZERO is set. + * %__GFP_ZEROTAGS zeroes memory tags at allocation time if the memory itself + * is being zeroed (either via __GFP_ZERO or via init_on_alloc). * * %__GFP_SKIP_KASAN_POISON returns a page which does not need to be poisoned * on deallocation. Typically used for userspace pages. Currently only has an