linux-next: build warning after merge of the mm tree

Stephen Rothwell
2022-05-25T05:54:14Z

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Hi all,

After merging the mm tree, today's linux-next build (sparc64 defconfig)
produced this warning:

In file included from include/linux/kernel.h:26,
from include/linux/cpumask.h:10,
from include/linux/smp.h:13,
from include/linux/lockdep.h:14,
from include/linux/spinlock.h:62,
from include/linux/mmzone.h:8,
from include/linux/gfp.h:6,
from include/linux/mm.h:7,
from mm/page_alloc.c:19:
mm/page_alloc.c: In function 'split_free_page':
include/linux/minmax.h:20:35: warning: comparison of distinct pointer types lacks a cast
20 | (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
| ^~
include/linux/minmax.h:26:18: note: in expansion of macro '__typecheck'
26 | (__typecheck(x, y) && __no_side_effects(x, y))
| ^~~~~~~~~~~
include/linux/minmax.h:36:31: note: in expansion of macro '__safe_cmp'
36 | __builtin_choose_expr(__safe_cmp(x, y), \
| ^~~~~~~~~~
include/linux/minmax.h:45:25: note: in expansion of macro '__careful_cmp'
45 | #define min(x, y) __careful_cmp(x, y, <)
| ^~~~~~~~~~~~~
mm/page_alloc.c:1138:35: note: in expansion of macro 'min'
1138 | free_page_order = min(pfn ? __ffs(pfn) : order, __fls(split_pfn_offset));
| ^~~

Introduced by commit

29a8af92b874 ("mm: fix a potential infinite loop in start_isolate_page_range()")