From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ig0-f171.google.com (mail-ig0-f171.google.com [209.85.213.171]) by kanga.kvack.org (Postfix) with ESMTP id CF7646B0255 for ; Fri, 31 Jul 2015 15:39:11 -0400 (EDT) Received: by igk11 with SMTP id 11so38724851igk.1 for ; Fri, 31 Jul 2015 12:39:11 -0700 (PDT) Received: from mga11.intel.com (mga11.intel.com. [192.55.52.93]) by mx.google.com with ESMTP id x1si12303234pdm.181.2015.07.31.12.39.11 for ; Fri, 31 Jul 2015 12:39:11 -0700 (PDT) From: "Sean O. Stalley" Subject: [PATCH v2 2/4] mm: Add dma_pool_zalloc() call to DMA API Date: Fri, 31 Jul 2015 12:36:42 -0700 Message-Id: <1438371404-3219-3-git-send-email-sean.stalley@intel.com> In-Reply-To: <1438371404-3219-1-git-send-email-sean.stalley@intel.com> References: <1438371404-3219-1-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, akpm@linux-foundation.org Cc: sean.stalley@intel.com, 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