Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753948AbbGOVSG (ORCPT ); Wed, 15 Jul 2015 17:18:06 -0400 Received: from mga02.intel.com ([134.134.136.20]:56353 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753347AbbGOVRA (ORCPT ); Wed, 15 Jul 2015 17:17:00 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.15,482,1432623600"; d="scan'208";a="763318913" From: "Sean O. Stalley" To: corbet@lwn.net, vinod.koul@intel.com, bhelgaas@google.com, Julia.Lawall@lip6.fr, Gilles.Muller@lip6.fr, nicolas.palix@imag.fr, mmarek@suse.cz Cc: sean.stalley@intel.com, akpm@linux-foundation.org, bigeasy@linutronix.de, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, dmaengine@vger.kernel.org, linux-pci@vger.kernel.org, linux-mm@kvack.org, cocci@systeme.lip6.fr Subject: [PATCH 2/4] mm: Add dma_pool_zalloc() call to DMA API Date: Wed, 15 Jul 2015 14:14:41 -0700 Message-Id: <1436994883-16563-3-git-send-email-sean.stalley@intel.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1436994883-16563-1-git-send-email-sean.stalley@intel.com> References: <1436994883-16563-1-git-send-email-sean.stalley@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1668 Lines: 51 Add a wrapper function for dma_pool_alloc() to get zeroed memory. Signed-off-by: Sean O. Stalley --- 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 5208840..988f757 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 022e34f..6d8079b 100644 --- a/include/linux/dmapool.h +++ b/include/linux/dmapool.h @@ -22,6 +22,12 @@ 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/