From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ob0-f173.google.com (mail-ob0-f173.google.com [209.85.214.173]) by kanga.kvack.org (Postfix) with ESMTP id 6CEBF6B0005 for ; Tue, 26 Jan 2016 01:33:45 -0500 (EST) Received: by mail-ob0-f173.google.com with SMTP id is5so136148834obc.0 for ; Mon, 25 Jan 2016 22:33:45 -0800 (PST) Received: from emea01-db3-obe.outbound.protection.outlook.com (mail-db3on0079.outbound.protection.outlook.com. [157.55.234.79]) by mx.google.com with ESMTPS id r7si20847268oew.52.2016.01.25.22.33.44 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 25 Jan 2016 22:33:44 -0800 (PST) From: Subject: [PATCH 1/2 v2] arm, arm64: change_memory_common with numpages == 0 should be no-op. Date: Tue, 26 Jan 2016 08:33:08 +0200 Message-ID: <1453789989-13260-2-git-send-email-mika.penttila@nextfour.com> In-Reply-To: <1453789989-13260-1-git-send-email-mika.penttila@nextfour.com> References: <1453789989-13260-1-git-send-email-mika.penttila@nextfour.com> MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit Sender: owner-linux-mm@kvack.org List-ID: To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, linux@arm.linux.org.uk, =?UTF-8?q?Mika=20Penttil=C3=A4?= From: Mika PenttilA? This makes the caller set_memory_xx() consistent with x86. arm64 part is rebased on 4.5.0-rc1 with Ard's patch lkml.kernel.org/g/<1453125665-26627-1-git-send-email-ard.biesheuvel@linaro.org> applied. Signed-off-by: Mika PenttilA? mika.penttila@nextfour.com Reviewed-by: Laura Abbott Acked-by: David Rientjes --- arch/arm/mm/pageattr.c | 3 +++ arch/arm64/mm/pageattr.c | 3 +++ 2 files changed, 6 insertions(+) diff --git a/arch/arm/mm/pageattr.c b/arch/arm/mm/pageattr.c index cf30daf..d19b1ad 100644 --- a/arch/arm/mm/pageattr.c +++ b/arch/arm/mm/pageattr.c @@ -49,6 +49,9 @@ static int change_memory_common(unsigned long addr, int numpages, WARN_ON_ONCE(1); } + if (!numpages) + return 0; + if (start < MODULES_VADDR || start >= MODULES_END) return -EINVAL; diff --git a/arch/arm64/mm/pageattr.c b/arch/arm64/mm/pageattr.c index 1360a02..b582fc2 100644 --- a/arch/arm64/mm/pageattr.c +++ b/arch/arm64/mm/pageattr.c @@ -53,6 +53,9 @@ static int change_memory_common(unsigned long addr, int numpages, WARN_ON_ONCE(1); } + if (!numpages) + return 0; + /* * Kernel VA mappings are always live, and splitting live section * mappings into page mappings may cause TLB conflicts. This means -- 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