+ mm-page_alloc-apply-per-task-gfp-context-in-bulk-allocator.patch added to mm-new branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: mm/page_alloc: apply per-task GFP context in bulk allocator
has been added to the -mm mm-new branch.  Its filename is
     mm-page_alloc-apply-per-task-gfp-context-in-bulk-allocator.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-page_alloc-apply-per-task-gfp-context-in-bulk-allocator.patch

This patch will later appear in the mm-new branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

Note, mm-new is a provisional staging ground for work-in-progress
patches, and acceptance into mm-new is a notification for others take
notice and to finish up reviews.  Please do not hesitate to respond to
review feedback and post updated versions to replace or incrementally
fixup patches in mm-new.

The mm-new branch of mm.git is not included in linux-next

If a few days of testing in mm-new is successful, the patch will me moved
into mm.git's mm-unstable branch, which is included in linux-next

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------------------------------------------------------
From: Qiqi Liu <liuqiqi@kylinos.cn>
Subject: mm/page_alloc: apply per-task GFP context in bulk allocator
Date: Mon, 14 Sep 2026 10:45:55 +0800

alloc_pages_bulk_noprof() does not call current_gfp_context(), so per-task
scoped allocation constraints (PF_MEMALLOC_NOIO, PF_MEMALLOC_NOFS,
PF_MEMALLOC_PIN) are not applied on the bulk fast path.

The most direct consequence is PF_MEMALLOC_PIN: without clearing
__GFP_MOVABLE, prepare_alloc_pages() selects MIGRATE_MOVABLE for the PCP
list, and a task under memalloc_pin_save() receives movable pages from the
bulk allocator.

Link: https://lore.kernel.org/20260914024555.138125-1-liuqiqi@kylinos.cn
Fixes: 387ba26fb1cb ("mm/page_alloc: add a bulk page allocator")
Signed-off-by: Qiqi Liu <liuqiqi@kylinos.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Brendan Jackman <brendan.jackman@linux.dev>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Cc: Zi Yan <ziy@nvidia.com>
Cc: <stable@vger.kernel.org>
---

 mm/page_alloc.c |    1 +
 1 file changed, 1 insertion(+)

--- a/mm/page_alloc.c~mm-page_alloc-apply-per-task-gfp-context-in-bulk-allocator
+++ a/mm/page_alloc.c
@@ -5201,6 +5201,7 @@ unsigned long alloc_pages_bulk_noprof(gf
 
 	/* May set ALLOC_NOFRAGMENT, fragmentation will return 1 page. */
 	gfp &= gfp_allowed_mask;
+	gfp = current_gfp_context(gfp);
 	if (!prepare_alloc_pages(gfp, 0, preferred_nid, nodemask, &ac, &gfp, &alloc_flags))
 		goto out;
 
_

Patches currently in -mm which might be from liuqiqi@kylinos.cn are

mm-page_alloc-add-missing-hooks-to-bulk-allocation-path.patch
mm-page_alloc-apply-per-task-gfp-context-in-bulk-allocator.patch