From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pd0-f171.google.com (mail-pd0-f171.google.com [209.85.192.171]) by kanga.kvack.org (Postfix) with ESMTP id 3D5406B0038 for ; Tue, 22 Jul 2014 21:35:16 -0400 (EDT) Received: by mail-pd0-f171.google.com with SMTP id z10so605043pdj.2 for ; Tue, 22 Jul 2014 18:35:15 -0700 (PDT) Received: from smtp.codeaurora.org (smtp.codeaurora.org. [198.145.11.231]) by mx.google.com with ESMTPS id tf1si769645pbc.15.2014.07.22.18.35.14 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 22 Jul 2014 18:35:14 -0700 (PDT) From: Laura Abbott Subject: [PATCHv4 2/5] lib/genalloc.c: Add genpool range check function Date: Tue, 22 Jul 2014 18:35:05 -0700 Message-Id: <1406079308-5232-3-git-send-email-lauraa@codeaurora.org> In-Reply-To: <1406079308-5232-1-git-send-email-lauraa@codeaurora.org> References: <1406079308-5232-1-git-send-email-lauraa@codeaurora.org> Sender: owner-linux-mm@kvack.org List-ID: To: Will Deacon , Catalin Marinas Cc: Laura Abbott , David Riley , linux-arm-kernel@lists.infradead.org, Ritesh Harjain , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Russell King , Thierry Reding , Arnd Bergmann 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. Acked-by: Will Deacon Reviewed-by: Olof Johansson 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 * -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, hosted by The Linux Foundation -- 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