From 74979dd6327bbaa96ecb8525f8ea6025715d5ba7 Mon Sep 17 00:00:00 2001
From: Xiongwei Song <sxwjean@gmail.com>
Date: Fri, 14 Jan 2022 14:07:24 -0800
Subject: [PATCH] mm: page_alloc: fix building error on -Werror=array-compare

Arthur Marsh reported we would hit the error below when building kernel
with gcc-12:

  CC      mm/page_alloc.o
  mm/page_alloc.c: In function `mem_init_print_info':
  mm/page_alloc.c:8173:27: error: comparison between two arrays [-Werror=array-compare]
   8173 |                 if (start <= pos && pos < end && size > adj) \
        |

In C++20, the comparision between arrays should be warned.

Link: https://lkml.kernel.org/r/20211125130928.32465-1-sxwjean@me.com
Signed-off-by: Xiongwei Song <sxwjean@gmail.com>
Reported-by: Arthur Marsh <arthur.marsh@internode.on.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Upstream-Status: Backport [https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ca831f29f8f25c97182e726429b38c0802200c8f]
Signed-off-by: Davidson K <davidson.kumaresan@arm.com>
Change-Id: I11931013f1fd42f0f2a75375cdfb129cb3a9d5aa
---
 mm/page_alloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 185fbddecc83..3affeeb194d4 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -8282,7 +8282,7 @@ void __init mem_init_print_info(void)
 	 */
 #define adj_init_size(start, end, size, pos, adj) \
 	do { \
-		if (start <= pos && pos < end && size > adj) \
+		if (&start[0] <= &pos[0] && &pos[0] < &end[0] && size > adj) \
 			size -= adj; \
 	} while (0)
 
-- 
2.34.1

