[PATCH 1/1] mm/mm_init: compute hash mask with unsigned arithmetic

[Longlong Xia]

From: Longlong Xia <xialonglong@xxxxxxxxxx>

alloc_large_system_hash() allows up to 2^31 buckets, so log2qty can
reach 31. At that limit, the current expression relies on signed
integer wrapping to produce the unsigned hash mask.

Use an unsigned literal so the mask is computed with unsigned
arithmetic. Supported compiler settings already produce the same
result, so this is a source-level cleanup with no functional change.

Assisted-by: Codex:gpt-5.6-sol
Signed-off-by: Longlong Xia <xialonglong@xxxxxxxxxx>
---
 mm/mm_init.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/mm_init.c b/mm/mm_init.c
index 498d62c4ece3..1883fe923ffb 100644
--- a/mm/mm_init.c
+++ b/mm/mm_init.c
@@ -2469,7 +2469,7 @@ void *__init alloc_large_system_hash(const char *tablename,
 	if (_hash_shift)
 		*_hash_shift = log2qty;
 	if (_hash_mask)
-		*_hash_mask = (1 << log2qty) - 1;
+		*_hash_mask = (1U << log2qty) - 1;
 
 	return table;
 }
-- 
2.43.0