1From ca831f29f8f25c97182e726429b38c0802200c8f Mon Sep 17 00:00:00 2001
2From: Xiongwei Song <sxwjean@gmail.com>
3Date: Fri, 14 Jan 2022 14:07:24 -0800
4Subject: mm: page_alloc: fix building error on -Werror=array-compare
5
6Arthur Marsh reported we would hit the error below when building kernel
7with gcc-12:
8
9  CC      mm/page_alloc.o
10  mm/page_alloc.c: In function `mem_init_print_info':
11  mm/page_alloc.c:8173:27: error: comparison between two arrays [-Werror=array-compare]
12   8173 |                 if (start <= pos && pos < end && size > adj) \
13        |
14
15In C++20, the comparision between arrays should be warned.
16
17Link: https://lkml.kernel.org/r/20211125130928.32465-1-sxwjean@me.com
18Signed-off-by: Xiongwei Song <sxwjean@gmail.com>
19Reported-by: Arthur Marsh <arthur.marsh@internode.on.net>
20Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
21Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
22Upstream: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ca831f29f8f25c97182e726429b38c0802200c8f
23Signed-off-by: Kilian Zinnecker <kilian.zinnecker@mail.de>
24---
25 mm/page_alloc.c | 2 +-
26 1 file changed, 1 insertion(+), 1 deletion(-)
27
28diff --git a/mm/page_alloc.c b/mm/page_alloc.c
29index 806f317c2e7e2..c4ef450ac4428 100644
30--- a/mm/page_alloc.c
31+++ b/mm/page_alloc.c
32@@ -8228,7 +8228,7 @@ void __init mem_init_print_info(void)
33 	 */
34 #define adj_init_size(start, end, size, pos, adj) \
35 	do { \
36-		if (start <= pos && pos < end && size > adj) \
37+		if (&start[0] <= &pos[0] && &pos[0] < &end[0] && size > adj) \
38 			size -= adj; \
39 	} while (0)
40
41--
42cgit
43
44