The patch titled
Subject: dmapool: speedup DMAPOOL_DEBUG with init_on_alloc
has been added to the -mm mm-unstable branch. Its filename is
dmapool-speedup-dmapool_debug-with-init_on_alloc.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/dmapool-speedup-dmapool_debug-with-init_on_alloc.patch
This patch will later appear in the mm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
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------------------------------------------------------
From: Tony Battersby <tonyb@xxxxxxxxxxxxxxx>
Subject: dmapool: speedup DMAPOOL_DEBUG with init_on_alloc
Date: Thu, 26 Jan 2023 13:51:18 -0800
Avoid double-memset of the same allocated memory in dma_pool_alloc() when
both DMAPOOL_DEBUG is enabled and init_on_alloc=1.
Link: https://lkml.kernel.org/r/20230126215125.4069751-6-kbusch@xxxxxxxx
Signed-off-by: Tony Battersby <tonyb@xxxxxxxxxxxxxxx>
Signed-off-by: Keith Busch <kbusch@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/dmapool.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/dmapool.c~dmapool-speedup-dmapool_debug-with-init_on_alloc
+++ a/mm/dmapool.c
@@ -356,7 +356,7 @@ void *dma_pool_alloc(struct dma_pool *po
break;
}
}
- if (!(mem_flags & __GFP_ZERO))
+ if (!want_init_on_alloc(mem_flags))
memset(retval, POOL_POISON_ALLOCATED, pool->size);
#endif
spin_unlock_irqrestore(&pool->lock, flags);
_
Patches currently in -mm which might be from tonyb@xxxxxxxxxxxxxxx are
dmapool-remove-checks-for-dev-==-null.patch
dmapool-use-sysfs_emit-instead-of-scnprintf.patch
dmapool-cleanup-integer-types.patch
dmapool-speedup-dmapool_debug-with-init_on_alloc.patch
