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dma/pool: Improve pool lookup

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If CONFIG_ZONE_DMA32 is enabled, but we have not allocated the
corresponding atomic_pool_dma32, dma_guess_pool() may return the NULL
value of that and fail a GFP_DMA32 allocation without trying to fall
back to other pools which may exist. Furthermore, if no GFP_DMA pool
exists, it is preferable to try GFP_DMA32 rather than immediately fall
back to GFP_KERNEL with even less chance of success. Improve matters
by encoding an explicit order of pool preference for each flag.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Tested-by: Vladimir Kondratiev <vladimir.kondratiev@mobileye.com>
Reviewed-by: Baoquan He <bhe@redhat.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/c846b1a2f43295cac926c7af2ce907f62baec518.1768230104.git.robin.murphy@arm.com
This commit is contained in:
Robin Murphy
2026-01-12 15:46:36 +00:00
committed by Marek Szyprowski
parent 7f2e8e1d22
commit b31ac41b59
1 changed files with 4 additions and 4 deletions
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8
kernel/dma/pool.c
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@@ -224,10 +224,10 @@ postcore_initcall(dma_atomic_pool_init);
static inline struct gen_pool *dma_guess_pool(struct gen_pool *prev, gfp_t gfp)
{
if (prev == NULL) {
if (IS_ENABLED(CONFIG_ZONE_DMA32) && (gfp & GFP_DMA32))
return atomic_pool_dma32;
if (atomic_pool_dma && (gfp & GFP_DMA))
return atomic_pool_dma;
if (gfp & GFP_DMA)
return atomic_pool_dma ?: atomic_pool_dma32 ?: atomic_pool_kernel;
if (gfp & GFP_DMA32)
return atomic_pool_dma32 ?: atomic_pool_dma ?: atomic_pool_kernel;
return atomic_pool_kernel;
}
if (prev == atomic_pool_kernel)