| From | andrey.konovalov@linux ... | Subject | [PATCH mm v4 07/39] mm: clarify __GFP_ZEROTAGS comment | Date | Mon, 20 Dec 2021 22:58:22 +0100 |
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From: Andrey Konovalov <andreyknvl@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.
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
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