From patchwork Tue Jun 17 01:39:22 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laura Abbott X-Patchwork-Id: 4363421 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 6440ABEEAA for ; Tue, 17 Jun 2014 01:42:23 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 8DB6720200 for ; Tue, 17 Jun 2014 01:42:22 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id B07152015E for ; Tue, 17 Jun 2014 01:42:21 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1WwiNb-0005wC-Q6; Tue, 17 Jun 2014 01:40:07 +0000 Received: from smtp.codeaurora.org ([198.145.11.231]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1WwiNL-0005Rz-6a for linux-arm-kernel@lists.infradead.org; Tue, 17 Jun 2014 01:39:52 +0000 Received: from smtp.codeaurora.org (localhost [127.0.0.1]) by smtp.codeaurora.org (Postfix) with ESMTP id 85F8E140AAA; Tue, 17 Jun 2014 01:39:33 +0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 486) id 77CB7140AAE; Tue, 17 Jun 2014 01:39:33 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=5.0 tests=BAYES_00,RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from lauraa-linux1.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: lauraa@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id D4ACF140AAA; Tue, 17 Jun 2014 01:39:32 +0000 (UTC) From: Laura Abbott To: Will Deacon , Catalin Marinas Subject: [PATCHv3 2/5] lib/genalloc.c: Add genpool range check function Date: Mon, 16 Jun 2014 18:39:22 -0700 Message-Id: <1402969165-7526-3-git-send-email-lauraa@codeaurora.org> X-Mailer: git-send-email 1.8.2.1 In-Reply-To: <1402969165-7526-1-git-send-email-lauraa@codeaurora.org> References: <1402969165-7526-1-git-send-email-lauraa@codeaurora.org> X-Virus-Scanned: ClamAV using ClamSMTP X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20140616_183951_305631_73C6ECAD X-CRM114-Status: GOOD ( 14.96 ) X-Spam-Score: -1.0 (-) Cc: David Riley , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Ritesh Harjain , Laura Abbott , linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP After allocating an address from a particular genpool, there is no good way to verify if that address actually belongs to a genpool. Introduce addr_in_gen_pool which will return if an address plus size falls completely within the genpool range. Signed-off-by: Laura Abbott --- include/linux/genalloc.h | 3 +++ lib/genalloc.c | 29 +++++++++++++++++++++++++++++ 2 files changed, 32 insertions(+) diff --git a/include/linux/genalloc.h b/include/linux/genalloc.h index 3cd0934..1ccaab4 100644 --- a/include/linux/genalloc.h +++ b/include/linux/genalloc.h @@ -121,6 +121,9 @@ extern struct gen_pool *devm_gen_pool_create(struct device *dev, int min_alloc_order, int nid); extern struct gen_pool *dev_get_gen_pool(struct device *dev); +bool addr_in_gen_pool(struct gen_pool *pool, unsigned long start, + size_t size); + #ifdef CONFIG_OF extern struct gen_pool *of_get_named_gen_pool(struct device_node *np, const char *propname, int index); diff --git a/lib/genalloc.c b/lib/genalloc.c index 9758529..66edf93 100644 --- a/lib/genalloc.c +++ b/lib/genalloc.c @@ -403,6 +403,35 @@ void gen_pool_for_each_chunk(struct gen_pool *pool, EXPORT_SYMBOL(gen_pool_for_each_chunk); /** + * addr_in_gen_pool - checks if an address falls within the range of a pool + * @pool: the generic memory pool + * @start: start address + * @size: size of the region + * + * Check if the range of addresses falls within the specified pool. Takes + * the rcu_read_lock for the duration of the check. + */ +bool addr_in_gen_pool(struct gen_pool *pool, unsigned long start, + size_t size) +{ + bool found = false; + unsigned long end = start + size; + struct gen_pool_chunk *chunk; + + rcu_read_lock(); + list_for_each_entry_rcu(chunk, &(pool)->chunks, next_chunk) { + if (start >= chunk->start_addr && start <= chunk->end_addr) { + if (end <= chunk->end_addr) { + found = true; + break; + } + } + } + rcu_read_unlock(); + return found; +} + +/** * gen_pool_avail - get available free space of the pool * @pool: pool to get available free space *