From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pa0-f47.google.com (mail-pa0-f47.google.com [209.85.220.47]) by kanga.kvack.org (Postfix) with ESMTP id E9D4E280245 for ; Wed, 15 Jul 2015 17:17:02 -0400 (EDT) Received: by pachj5 with SMTP id hj5so30316215pac.3 for ; Wed, 15 Jul 2015 14:17:02 -0700 (PDT) Received: from mga14.intel.com (mga14.intel.com. [192.55.52.115]) by mx.google.com with ESMTP id uc10si9463457pac.78.2015.07.15.14.17.02 for ; Wed, 15 Jul 2015 14:17:02 -0700 (PDT) From: "Sean O. Stalley" 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> 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: owner-linux-mm@kvack.org List-ID: 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 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, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org