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mm: page_alloc: fix building error on -Werror=array-compare

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commit ca831f29f8 upstream.

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>
Cc: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Xiongwei Song 2022-01-14 14:07:24 -08:00 committed by Greg Kroah-Hartman
parent ab4d82d4d9
commit a148698a40
1 changed files with 1 additions and 1 deletions
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2
mm/page_alloc.c
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@ -6737,7 +6737,7 @@ void __init mem_init_print_info(const char *str)
*/
#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)