From: Xiongwei Song <sxwjean@xxxxxxxxx> commit ca831f29f8f25c97182e726429b38c0802200c8f 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@xxxxxx Signed-off-by: Xiongwei Song <sxwjean@xxxxxxxxx> Reported-by: Arthur Marsh <arthur.marsh@xxxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Cc: Khem Raj <raj.khem@xxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- mm/page_alloc.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -8169,7 +8169,7 @@ 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) Patches currently in stable-queue which might be from sxwjean@xxxxxxxxx are queue-5.15/mm-page_alloc-fix-building-error-on-werror-array-compare.patch