[patch 081/146] mm: page_alloc: fix building error on -Werror=array-compare

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From: Xiongwei Song <sxwjean@xxxxxxxxx>
Subject: 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@xxxxxx
Signed-off-by: Xiongwei Song <sxwjean@xxxxxxxxx>
Reported-by: Arthur Marsh <arthur.marsh@xxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 mm/page_alloc.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/page_alloc.c~mm-page_alloc-fix-building-error-on-werror=array-compare
+++ a/mm/page_alloc.c
@@ -8228,7 +8228,7 @@ 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)
 
_



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