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Message-ID: <b1100f23-7a75-c5a0-851c-42d62554efa2@cybernetics.com>
Date:   Tue, 7 Jun 2022 14:44:58 -0400
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Subject: [PATCH v6 08/11] dmapool: speedup DMAPOOL_DEBUG with init_on_alloc
Content-Language: en-US
From:   Tony Battersby <tonyb@cybernetics.com>
To:     linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc:     iommu@lists.linux-foundation.org, kernel-team@fb.com,
        Matthew Wilcox <willy@infradead.org>,
        Keith Busch <kbusch@kernel.org>,
        Andy Shevchenko <andy.shevchenko@gmail.com>,
        Robin Murphy <robin.murphy@arm.com>,
        Tony Lindgren <tony@atomide.com>
References: <340ff8ef-9ff5-7175-c234-4132bbdfc5f7@cybernetics.com>
In-Reply-To: <340ff8ef-9ff5-7175-c234-4132bbdfc5f7@cybernetics.com>
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Avoid double-memset of the same allocated memory in dma_pool_alloc()
when both DMAPOOL_DEBUG is enabled and init_on_alloc=1.

Signed-off-by: Tony Battersby <tonyb@cybernetics.com>
---
 mm/dmapool.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/dmapool.c b/mm/dmapool.c
index 44038089a41a..c7ec38cb4631 100644
--- a/mm/dmapool.c
+++ b/mm/dmapool.c
@@ -356,7 +356,7 @@ void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags,
 			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);
-- 
2.25.1