linux-kernel - [PATCH v2] mm: remove redundant __GFP

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Message-Id: <20250812135225.274316-1-rongqianfeng@vivo.com>
Date: Tue, 12 Aug 2025 21:52:25 +0800
From: Qianfeng Rong <rongqianfeng@...o.com>
To: SeongJae Park <sj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Matthew Wilcox (Oracle)" <willy@...radead.org>,
	Will Deacon <will@...nel.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@...nel.org>,
	Nick Piggin <npiggin@...il.com>,
	Peter Zijlstra <peterz@...radead.org>,
	David Hildenbrand <david@...hat.com>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Rik van Riel <riel@...riel.com>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	Harry Yoo <harry.yoo@...cle.com>,
	Uladzislau Rezki <urezki@...il.com>,
	damon@...ts.linux.dev,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	linux-arch@...r.kernel.org
Cc: Qianfeng Rong <rongqianfeng@...o.com>
Subject: [PATCH v2] mm: remove redundant __GFP_NOWARN

Commit 16f5dfbc851b ("gfp: include __GFP_NOWARN in GFP_NOWAIT") made
GFP_NOWAIT implicitly include __GFP_NOWARN.

Therefore, explicit __GFP_NOWARN combined with GFP_NOWAIT (e.g.,
`GFP_NOWAIT | __GFP_NOWARN`) is now redundant.  Let's clean up these
redundant flags across subsystems.

No functional changes.

Reviewed-by: Harry Yoo <harry.yoo@...cle.com>
Signed-off-by: Qianfeng Rong <rongqianfeng@...o.com>
---
v1->v2:
- Added a modification to remove redundant __GFP_NOWARN in
  mm/damon/ops-common.c
---
 mm/damon/ops-common.c | 2 +-
 mm/filemap.c          | 2 +-
 mm/mmu_gather.c       | 4 ++--
 mm/rmap.c             | 2 +-
 mm/vmalloc.c          | 2 +-
 5 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/mm/damon/ops-common.c b/mm/damon/ops-common.c
index 99321ff5cb92..b43595730f08 100644
--- a/mm/damon/ops-common.c
+++ b/mm/damon/ops-common.c
@@ -303,7 +303,7 @@ static unsigned int __damon_migrate_folio_list(
 		 * instead of migrated.
 		 */
 		.gfp_mask = (GFP_HIGHUSER_MOVABLE & ~__GFP_RECLAIM) |
-			__GFP_NOWARN | __GFP_NOMEMALLOC | GFP_NOWAIT,
+			__GFP_NOMEMALLOC | GFP_NOWAIT,
 		.nid = target_nid,
 	};
 
diff --git a/mm/filemap.c b/mm/filemap.c
index 4e5c9544fee4..c21e98657e0b 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1961,7 +1961,7 @@ struct folio *__filemap_get_folio(struct address_space *mapping, pgoff_t index,
 			gfp &= ~__GFP_FS;
 		if (fgp_flags & FGP_NOWAIT) {
 			gfp &= ~GFP_KERNEL;
-			gfp |= GFP_NOWAIT | __GFP_NOWARN;
+			gfp |= GFP_NOWAIT;
 		}
 		if (WARN_ON_ONCE(!(fgp_flags & (FGP_LOCK | FGP_FOR_MMAP))))
 			fgp_flags |= FGP_LOCK;
diff --git a/mm/mmu_gather.c b/mm/mmu_gather.c
index b49cc6385f1f..374aa6f021c6 100644
--- a/mm/mmu_gather.c
+++ b/mm/mmu_gather.c
@@ -32,7 +32,7 @@ static bool tlb_next_batch(struct mmu_gather *tlb)
 	if (tlb->batch_count == MAX_GATHER_BATCH_COUNT)
 		return false;
 
-	batch = (void *)__get_free_page(GFP_NOWAIT | __GFP_NOWARN);
+	batch = (void *)__get_free_page(GFP_NOWAIT);
 	if (!batch)
 		return false;
 
@@ -364,7 +364,7 @@ void tlb_remove_table(struct mmu_gather *tlb, void *table)
 	struct mmu_table_batch **batch = &tlb->batch;
 
 	if (*batch == NULL) {
-		*batch = (struct mmu_table_batch *)__get_free_page(GFP_NOWAIT | __GFP_NOWARN);
+		*batch = (struct mmu_table_batch *)__get_free_page(GFP_NOWAIT);
 		if (*batch == NULL) {
 			tlb_table_invalidate(tlb);
 			tlb_remove_table_one(table);
diff --git a/mm/rmap.c b/mm/rmap.c
index 568198e9efc2..7baa7385e1ce 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -285,7 +285,7 @@ int anon_vma_clone(struct vm_area_struct *dst, struct vm_area_struct *src)
 	list_for_each_entry_reverse(pavc, &src->anon_vma_chain, same_vma) {
 		struct anon_vma *anon_vma;
 
-		avc = anon_vma_chain_alloc(GFP_NOWAIT | __GFP_NOWARN);
+		avc = anon_vma_chain_alloc(GFP_NOWAIT);
 		if (unlikely(!avc)) {
 			unlock_anon_vma_root(root);
 			root = NULL;
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 6dbcdceecae1..90c3de1a0417 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -5177,7 +5177,7 @@ static void vmap_init_nodes(void)
 	int n = clamp_t(unsigned int, num_possible_cpus(), 1, 128);
 
 	if (n > 1) {
-		vn = kmalloc_array(n, sizeof(*vn), GFP_NOWAIT | __GFP_NOWARN);
+		vn = kmalloc_array(n, sizeof(*vn), GFP_NOWAIT);
 		if (vn) {
 			/* Node partition is 16 pages. */
 			vmap_zone_size = (1 << 4) * PAGE_SIZE;
-- 
2.34.1