linux-kernel - [PATCH] fs: drop GFP_NOFAIL mode from alloc_page

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Message-ID: <20240829130640.1397970-1-mhocko@kernel.org>
Date: Thu, 29 Aug 2024 15:06:40 +0200
From: Michal Hocko <mhocko@...nel.org>
To: linux-fsdevel@...r.kernel.org,
	linux-raid@...r.kernel.org
Cc: linux-kernel@...r.kernel.org,
	Song Liu <song@...nel.org>,
	Yu Kuai <yukuai3@...wei.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>,
	Jan Kara <jack@...e.cz>,
	Michal Hocko <mhocko@...e.com>
Subject: [PATCH] fs: drop GFP_NOFAIL mode from alloc_page_buffers

From: Michal Hocko <mhocko@...e.com>

There is only one called of alloc_page_buffers and it doesn't require
__GFP_NOFAIL so drop this allocation mode.

Signed-off-by: Michal Hocko <mhocko@...e.com>
---
 drivers/md/md-bitmap.c      | 2 +-
 fs/buffer.c                 | 5 +----
 include/linux/buffer_head.h | 3 +--
 3 files changed, 3 insertions(+), 7 deletions(-)

while looking at GFP_NOFAIL users I have encountered this left over.

diff --git a/drivers/md/md-bitmap.c b/drivers/md/md-bitmap.c
index 08232d8dc815..db5330d97348 100644
--- a/drivers/md/md-bitmap.c
+++ b/drivers/md/md-bitmap.c
@@ -360,7 +360,7 @@ static int read_file_page(struct file *file, unsigned long index,
 	pr_debug("read bitmap file (%dB @ %llu)\n", (int)PAGE_SIZE,
 		 (unsigned long long)index << PAGE_SHIFT);
 
-	bh = alloc_page_buffers(page, blocksize, false);
+	bh = alloc_page_buffers(page, blocksize);
 	if (!bh) {
 		ret = -ENOMEM;
 		goto out;
diff --git a/fs/buffer.c b/fs/buffer.c
index e55ad471c530..f1381686d325 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -958,12 +958,9 @@ struct buffer_head *folio_alloc_buffers(struct folio *folio, unsigned long size,
 }
 EXPORT_SYMBOL_GPL(folio_alloc_buffers);
 
-struct buffer_head *alloc_page_buffers(struct page *page, unsigned long size,
-				       bool retry)
+struct buffer_head *alloc_page_buffers(struct page *page, unsigned long size)
 {
 	gfp_t gfp = GFP_NOFS | __GFP_ACCOUNT;
-	if (retry)
-		gfp |= __GFP_NOFAIL;
 
 	return folio_alloc_buffers(page_folio(page), size, gfp);
 }
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index 14acf1bbe0ce..7e903457967a 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -199,8 +199,7 @@ void folio_set_bh(struct buffer_head *bh, struct folio *folio,
 		  unsigned long offset);
 struct buffer_head *folio_alloc_buffers(struct folio *folio, unsigned long size,
 					gfp_t gfp);
-struct buffer_head *alloc_page_buffers(struct page *page, unsigned long size,
-		bool retry);
+struct buffer_head *alloc_page_buffers(struct page *page, unsigned long size);
 struct buffer_head *create_empty_buffers(struct folio *folio,
 		unsigned long blocksize, unsigned long b_state);
 void end_buffer_read_sync(struct buffer_head *bh, int uptodate);
-- 
2.46.0