Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932583AbaJXKT0 (ORCPT ); Fri, 24 Oct 2014 06:19:26 -0400 Received: from galahad.ideasonboard.com ([185.26.127.97]:44723 "EHLO galahad.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756120AbaJXKSt (ORCPT ); Fri, 24 Oct 2014 06:18:49 -0400 From: Laurent Pinchart To: linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-sh@vger.kernel.org, Marek Szyprowski , Russell King - ARM Linux , Michal Nazarewicz , Joonsoo Kim , Weijie Yang Subject: [PATCH v2 2/4] mm: cma: Always consider a 0 base address reservation as dynamic Date: Fri, 24 Oct 2014 13:18:40 +0300 Message-Id: <1414145922-26042-3-git-send-email-laurent.pinchart+renesas@ideasonboard.com> X-Mailer: git-send-email 2.0.4 In-Reply-To: <1414145922-26042-1-git-send-email-laurent.pinchart+renesas@ideasonboard.com> References: <1414145922-26042-1-git-send-email-laurent.pinchart+renesas@ideasonboard.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The fixed parameter to cma_declare_contiguous() tells the function whether the given base address must be honoured or should be considered as a hint only. The API considers a zero base address as meaning any base address, which must never be considered as a fixed value. Part of the implementation correctly checks both fixed and base != 0, but two locations check the fixed value only. Set fixed to false when base is 0 to fix that and simplify the code. Signed-off-by: Laurent Pinchart Acked-by: Michal Nazarewicz --- mm/cma.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/mm/cma.c b/mm/cma.c index 5aa1a6f74dec..62a5dccc3fb8 100644 --- a/mm/cma.c +++ b/mm/cma.c @@ -245,6 +245,9 @@ int __init cma_declare_contiguous(phys_addr_t base, size = ALIGN(size, alignment); limit &= ~(alignment - 1); + if (!base) + fixed = false; + /* size should be aligned with order_per_bit */ if (!IS_ALIGNED(size >> PAGE_SHIFT, 1 << order_per_bit)) return -EINVAL; @@ -268,7 +271,7 @@ int __init cma_declare_contiguous(phys_addr_t base, } /* Reserve memory */ - if (base && fixed) { + if (fixed) { if (memblock_is_region_reserved(base, size) || memblock_reserve(base, size) < 0) { ret = -EBUSY; -- 2.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/