linux-kernel - [PATCH 4.2.y-ckt 02/64] mm: add dma_pool

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu,  4 Feb 2016 14:43:45 -0800
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	"Sean O. Stalley" <sean.stalley@...el.com>,
	Vinod Koul <vinod.koul@...el.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Gilles Muller <Gilles.Muller@...6.fr>,
	Nicolas Palix <nicolas.palix@...g.fr>,
	Michal Marek <mmarek@...e.cz>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Jonathan Corbet <corbet@....net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 4.2.y-ckt 02/64] mm: add dma_pool_zalloc() call to DMA API

4.2.8-ckt4 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

From: "Sean O. Stalley" <sean.stalley@...el.com>

commit ad82362b2defd4adad87d8538617b2f51a4bf9c3 upstream.

Add a wrapper function for dma_pool_alloc() to get zeroed memory.

Signed-off-by: Sean O. Stalley <sean.stalley@...el.com>
Cc: Vinod Koul <vinod.koul@...el.com>
Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Cc: Gilles Muller <Gilles.Muller@...6.fr>
Cc: Nicolas Palix <nicolas.palix@...g.fr>
Cc: Michal Marek <mmarek@...e.cz>
Cc: Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc: Jonathan Corbet <corbet@....net>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
[ kamal: 4.2-stable prereq for
  27bc944 dmaengine: bcm2835-dma: Convert to use DMA pool ]
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 Documentation/DMA-API.txt | 7 +++++++
 include/linux/dmapool.h   | 6 ++++++
 2 files changed, 13 insertions(+)

diff --git a/Documentation/DMA-API.txt b/Documentation/DMA-API.txt
index 7eba542..edccacd 100644
--- a/Documentation/DMA-API.txt
+++ b/Documentation/DMA-API.txt
@@ -104,6 +104,13 @@ crossing restrictions, pass 0 for alloc; passing 4096 says memory allocated
 from this pool must not cross 4KByte boundaries.
 
 
+	void *dma_pool_zalloc(struct dma_pool *pool, gfp_t mem_flags,
+			      dma_addr_t *handle)
+
+Wraps dma_pool_alloc() and also zeroes the returned memory if the
+allocation attempt succeeded.
+
+
 	void *dma_pool_alloc(struct dma_pool *pool, gfp_t gfp_flags,
 			dma_addr_t *dma_handle);
 
diff --git a/include/linux/dmapool.h b/include/linux/dmapool.h
index e1043f7..53ba737 100644
--- a/include/linux/dmapool.h
+++ b/include/linux/dmapool.h
@@ -24,6 +24,12 @@ void dma_pool_destroy(struct dma_pool *pool);
 void *dma_pool_alloc(struct dma_pool *pool, gfp_t mem_flags,
 		     dma_addr_t *handle);
 
+static inline void *dma_pool_zalloc(struct dma_pool *pool, gfp_t mem_flags,
+				    dma_addr_t *handle)
+{
+	return dma_pool_alloc(pool, mem_flags | __GFP_ZERO, handle);
+}
+
 void dma_pool_free(struct dma_pool *pool, void *vaddr, dma_addr_t addr);
 
 /*
-- 
1.9.1