From patchwork Fri Jul 31 19:36:42 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Sean O. Stalley" X-Patchwork-Id: 502728 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 4CF82140D18 for ; Sat, 1 Aug 2015 05:40:26 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752469AbbGaTjN (ORCPT ); Fri, 31 Jul 2015 15:39:13 -0400 Received: from mga01.intel.com ([192.55.52.88]:47859 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752410AbbGaTjL (ORCPT ); Fri, 31 Jul 2015 15:39:11 -0400 Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga101.fm.intel.com with ESMTP; 31 Jul 2015 12:39:10 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.15,586,1432623600"; d="scan'208";a="533873142" Received: from dev.jf.intel.com ([134.134.147.74]) by FMSMGA003.fm.intel.com with ESMTP; 31 Jul 2015 12:39:01 -0700 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, 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 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> X-Mailer: git-send-email 1.9.1 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: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org 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); /*