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mm/mempool: warn about __GFP_ZERO usage
Memory obtained via mempool_alloc is not always zeroed even when called with __GFP_ZERO. Add a note and VM_BUG_ON statement to make that clear. [akpm@linux-foundation.org: use VM_WARN_ON_ONCE] Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -192,6 +192,7 @@ EXPORT_SYMBOL(mempool_resize);
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* returns NULL. Note that due to preallocation, this function
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* *never* fails when called from process contexts. (it might
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* fail if called from an IRQ context.)
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* Note: using __GFP_ZERO is not supported.
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*/
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void * mempool_alloc(mempool_t *pool, gfp_t gfp_mask)
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{
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@ -200,6 +201,7 @@ void * mempool_alloc(mempool_t *pool, gfp_t gfp_mask)
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wait_queue_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_sleep_if(gfp_mask & __GFP_WAIT);
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gfp_mask |= __GFP_NOMEMALLOC; /* don't allocate emergency reserves */
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