The patch titled
Subject: mm: also update the doc for __GFP_NOFAIL with order > 1
has been added to the -mm mm-unstable branch. Its filename is
mm-warn-about-illegal-__gfp_nofail-usage-in-a-more-appropriate-location-and-manner-fix.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-warn-about-illegal-__gfp_nofail-usage-in-a-more-appropriate-location-and-manner-fix.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Barry Song <v-songbaohua@xxxxxxxx>
Subject: mm: also update the doc for __GFP_NOFAIL with order > 1
Date: Wed, 4 Sep 2024 10:26:19 +1200
Obviously we only support order <= 1 __GFP_NOFAIL allocation and if
someone wants larger memory, they should consider using kvmalloc()
instead.
Link: https://lkml.kernel.org/r/20240903223935.1697-1-21cnbao@xxxxxxxxx
Signed-off-by: Barry Song <v-songbaohua@xxxxxxxx>
Suggested-by: David Hildenbrand <david@xxxxxxxxxx>
Suggested-by: Michal Hocko <mhocko@xxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/gfp_types.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/include/linux/gfp_types.h~mm-warn-about-illegal-__gfp_nofail-usage-in-a-more-appropriate-location-and-manner-fix
+++ a/include/linux/gfp_types.h
@@ -253,7 +253,8 @@ enum {
* used only when there is no reasonable failure policy) but it is
* definitely preferable to use the flag rather than opencode endless
* loop around allocator.
- * Using this flag for costly allocations is _highly_ discouraged.
+ * Allocating pages from the buddy with __GFP_NOFAIL and order > 1 is
+ * not supported. Please consider using kvmalloc() instead.
*/
#define __GFP_IO ((__force gfp_t)___GFP_IO)
#define __GFP_FS ((__force gfp_t)___GFP_FS)
_
Patches currently in -mm which might be from v-songbaohua@xxxxxxxx are
mm-rename-instances-of-swap_info_struct-to-meaningful-si.patch
mm-attempt-to-batch-free-swap-entries-for-zap_pte_range.patch
mm-attempt-to-batch-free-swap-entries-for-zap_pte_range-fix.patch
mm-count-the-number-of-anonymous-thps-per-size.patch
mm-count-the-number-of-partially-mapped-anonymous-thps-per-size.patch
mm-document-__gfp_nofail-must-be-blockable.patch
mm-warn-about-illegal-__gfp_nofail-usage-in-a-more-appropriate-location-and-manner.patch
mm-warn-about-illegal-__gfp_nofail-usage-in-a-more-appropriate-location-and-manner-fix.patch
