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Message-ID: <tencent_917BFA629ACDD8A2E6A32C53CEA147C66409@qq.com> Date: Thu, 11 Dec 2025 18:24:05 +0800 From: Yankai Xu <815559068@...com> To: linux-kernel@...r.kernel.org Cc: linux-mm@...ck.org, akpm@...ux-foundation.org, Yankai Xu <815559068@...com> Subject: [PATCH] mm/gfp: cast GFP_ZONE_TABLE entries to long to avoid shift overflow When a new zone is added to enum zone_type in mmzone.h, the existing GFP_ZONE_TABLE macro causes a compile-time shift overflow. This happens because enum zone_type is of type int. The shift is logically valid because it has been checked by 16 * GFP_ZONES_SHIFT > BITS_PER_LONG previously. Fixed this by casting each value in GFP_ZONE_TABLE to type long. Signed-off-by: Yankai Xu <815559068@...com> --- include/linux/gfp.h | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/include/linux/gfp.h b/include/linux/gfp.h index b155929af..e694f3103 100644 --- a/include/linux/gfp.h +++ b/include/linux/gfp.h @@ -122,14 +122,14 @@ static inline bool gfpflags_allow_spinning(const gfp_t gfp_flags) #endif #define GFP_ZONE_TABLE ( \ - (ZONE_NORMAL << 0 * GFP_ZONES_SHIFT) \ - | (OPT_ZONE_DMA << ___GFP_DMA * GFP_ZONES_SHIFT) \ - | (OPT_ZONE_HIGHMEM << ___GFP_HIGHMEM * GFP_ZONES_SHIFT) \ - | (OPT_ZONE_DMA32 << ___GFP_DMA32 * GFP_ZONES_SHIFT) \ - | (ZONE_NORMAL << ___GFP_MOVABLE * GFP_ZONES_SHIFT) \ - | (OPT_ZONE_DMA << (___GFP_MOVABLE | ___GFP_DMA) * GFP_ZONES_SHIFT) \ - | (ZONE_MOVABLE << (___GFP_MOVABLE | ___GFP_HIGHMEM) * GFP_ZONES_SHIFT)\ - | (OPT_ZONE_DMA32 << (___GFP_MOVABLE | ___GFP_DMA32) * GFP_ZONES_SHIFT)\ + ((long)ZONE_NORMAL << 0 * GFP_ZONES_SHIFT) \ + | ((long)OPT_ZONE_DMA << ___GFP_DMA * GFP_ZONES_SHIFT) \ + | ((long)OPT_ZONE_HIGHMEM << ___GFP_HIGHMEM * GFP_ZONES_SHIFT) \ + | ((long)OPT_ZONE_DMA32 << ___GFP_DMA32 * GFP_ZONES_SHIFT) \ + | ((long)ZONE_NORMAL << ___GFP_MOVABLE * GFP_ZONES_SHIFT) \ + | ((long)OPT_ZONE_DMA << (___GFP_MOVABLE | ___GFP_DMA) * GFP_ZONES_SHIFT) \ + | ((long)ZONE_MOVABLE << (___GFP_MOVABLE | ___GFP_HIGHMEM) * GFP_ZONES_SHIFT)\ + | ((long)OPT_ZONE_DMA32 << (___GFP_MOVABLE | ___GFP_DMA32) * GFP_ZONES_SHIFT)\ ) /* -- 2.43.0
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