linux-kernel - [PATCH] f2fs: fix compile warning

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Date:   Tue, 2 Mar 2021 16:44:58 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     <jaegeuk@...nel.org>
CC:     <linux-f2fs-devel@...ts.sourceforge.net>,
        <linux-kernel@...r.kernel.org>, <chao@...nel.org>,
        Chao Yu <yuchao0@...wei.com>
Subject: [PATCH] f2fs: fix compile warning

node.c: In function ‘f2fs_restore_node_summary’:
./include/linux/minmax.h:18:28: warning: comparison of distinct pointer types lacks a cast
  (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
                            ^
./include/linux/minmax.h:32:4: note: in expansion of macro ‘__typecheck’
   (__typecheck(x, y) && __no_side_effects(x, y))
    ^
./include/linux/minmax.h:42:24: note: in expansion of macro ‘__safe_cmp’
  __builtin_choose_expr(__safe_cmp(x, y), \
                        ^
./include/linux/minmax.h:51:19: note: in expansion of macro ‘__careful_cmp’
 #define min(x, y) __careful_cmp(x, y, <)
                   ^
node.c:2750:13: note: in expansion of macro ‘min’
   nrpages = min(last_offset - i, BIO_MAX_PAGES);

Use min_t() rather than min() to do type cast before comparing.

Signed-off-by: Chao Yu <yuchao0@...wei.com>
---
 fs/f2fs/node.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index a8a0fb890e8d..77f9ffaf9b8e 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -2747,7 +2747,8 @@ int f2fs_restore_node_summary(struct f2fs_sb_info *sbi,
 	sum_entry = &sum->entries[0];
 
 	for (i = 0; i < last_offset; i += nrpages, addr += nrpages) {
-		nrpages = min(last_offset - i, BIO_MAX_PAGES);
+		nrpages = min_t(unsigned long, last_offset - i,
+						BIO_MAX_PAGES);
 
 		/* readahead node pages */
 		f2fs_ra_meta_pages(sbi, addr, nrpages, META_POR, true);
-- 
2.29.2