Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
mempool: factor out a mempool_adjust_gfp helper
Add a helper to better isolate and document the gfp flags adjustments.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://patch.msgid.link/20251113084022.1255121-6-hch@lst.de
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
authored by
Christoph Hellwig
and committed by
Vlastimil Babka
3d249240
b77fc08e
+14
-7
+14
-7
mm/mempool.c
+14
-7
mm/mempool.c
···
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}
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EXPORT_SYMBOL(mempool_resize);
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/*
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* Adjust the gfp flags for mempool allocations, as we never want to dip into
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* the global emergency reserves or retry in the page allocator.
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*
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* The first pass also doesn't want to go reclaim, but the next passes do, so
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* return a separate subset for that first iteration.
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*/
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static inline gfp_t mempool_adjust_gfp(gfp_t *gfp_mask)
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{
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*gfp_mask |= __GFP_NOMEMALLOC | __GFP_NORETRY | __GFP_NOWARN;
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return *gfp_mask & ~(__GFP_DIRECT_RECLAIM | __GFP_IO);
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}
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/**
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* mempool_alloc - allocate an element from a memory pool
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* @pool: pointer to the memory pool
···
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*/
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void *mempool_alloc_noprof(mempool_t *pool, gfp_t gfp_mask)
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{
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gfp_t gfp_temp = mempool_adjust_gfp(&gfp_mask);
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void *element;
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unsigned long flags;
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wait_queue_entry_t wait;
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gfp_t gfp_temp;
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VM_WARN_ON_ONCE(gfp_mask & __GFP_ZERO);
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might_alloc(gfp_mask);
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gfp_mask |= __GFP_NOMEMALLOC; /* don't allocate emergency reserves */
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gfp_mask |= __GFP_NORETRY; /* don't loop in __alloc_pages */
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gfp_mask |= __GFP_NOWARN; /* failures are OK */
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gfp_temp = gfp_mask & ~(__GFP_DIRECT_RECLAIM|__GFP_IO);
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repeat_alloc:
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if (should_fail_ex(&fail_mempool_alloc, 1, FAULT_NOWARN)) {