linux-kernel - [PATCH] btrfs: fix signedness issue in min()

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Message-Id: <20250314155447.124842-1-arnd@kernel.org>
Date: Fri, 14 Mar 2025 16:54:41 +0100
From: Arnd Bergmann <arnd@...nel.org>
To: Chris Mason <clm@...com>,
	Josef Bacik <josef@...icpanda.com>,
	David Sterba <dsterba@...e.com>,
	Qu Wenruo <wqu@...e.com>
Cc: Arnd Bergmann <arnd@...db.de>,
	Johannes Thumshirn <johannes.thumshirn@....com>,
	Filipe Manana <fdmanana@...e.com>,
	Li Zetao <lizetao1@...wei.com>,
	linux-btrfs@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] btrfs: fix signedness issue in min()

From: Arnd Bergmann <arnd@...db.de>

Comparing a u64 to an loff_t causes a warning in min()

fs/btrfs/extent_io.c: In function 'extent_write_locked_range':
include/linux/compiler_types.h:557:45: error: call to '__compiletime_assert_588' declared with attribute error: min(folio_pos(folio) + folio_size(folio) - 1, end) signedness error
fs/btrfs/extent_io.c:2472:27: note: in expansion of macro 'min'
 2472 |                 cur_end = min(folio_pos(folio) + folio_size(folio) - 1, end);
      |                           ^~~

Use min_t() instead.

Fixes: f286b1c72175 ("btrfs: prepare extent_io.c for future larger folio support")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 fs/btrfs/extent_io.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index c2451194be66..88bced0bfa51 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2468,7 +2468,7 @@ void extent_write_locked_range(struct inode *inode, const struct folio *locked_f
 			continue;
 		}
 
-		cur_end = min(folio_pos(folio) + folio_size(folio) - 1, end);
+		cur_end = min_t(u64, folio_pos(folio) + folio_size(folio) - 1, end);
 		cur_len = cur_end + 1 - cur;
 
 		ASSERT(folio_test_locked(folio));
-- 
2.39.5