linux-kernel - [PATCH 3/6] lib/scatterlist: Skip requesting zeroed allocations in sgl_alloc

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Date:   Wed, 26 Sep 2018 15:16:22 +0100
From:   Tvrtko Ursulin <tursulin@...ulin.net>
To:     linux-kernel@...r.kernel.org
Cc:     tursulin@...ulin.net, tvrtko.ursulin@...ux.intel.com,
        Tvrtko Ursulin <tvrtko.ursulin@...el.com>,
        Bart Van Assche <bart.vanassche@....com>,
        Hannes Reinecke <hare@...e.com>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 3/6] lib/scatterlist: Skip requesting zeroed allocations in sgl_alloc_order

From: Tvrtko Ursulin <tvrtko.ursulin@...el.com>

sg_init_table will clear the allocated block so requesting zeroed memory
from the allocator is redundant.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@...el.com>
Cc: Bart Van Assche <bart.vanassche@....com>
Cc: Hannes Reinecke <hare@...e.com>
Cc: Johannes Thumshirn <jthumshirn@...e.de>
Cc: Jens Axboe <axboe@...nel.dk>
---
 lib/scatterlist.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/lib/scatterlist.c b/lib/scatterlist.c
index 23e53dce897d..3cc01cd82242 100644
--- a/lib/scatterlist.c
+++ b/lib/scatterlist.c
@@ -495,8 +495,7 @@ struct scatterlist *sgl_alloc_order(unsigned long length, unsigned int order,
 			return NULL;
 		nalloc++;
 	}
-	sgl = kmalloc_array(nalloc, sizeof(struct scatterlist),
-			    (gfp & ~GFP_DMA) | __GFP_ZERO);
+	sgl = kmalloc_array(nalloc, sizeof(struct scatterlist), gfp & ~GFP_DMA);
 	if (!sgl)
 		return NULL;
 
-- 
2.17.1