linux-kernel - [PATCH 1/2 v2] arm, arm64: change_memory_common with numpages == 0 should be no-op.

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Message-ID: <1453789989-13260-2-git-send-email-mika.penttila@nextfour.com>
Date:	Tue, 26 Jan 2016 08:33:08 +0200
From:	<mika.penttila@...tfour.com>
To:	<linux-kernel@...r.kernel.org>
CC:	<linux-mm@...ck.org>, <linux@....linux.org.uk>,
	Mika Penttilä <mika.penttila@...tfour.com>
Subject: [PATCH 1/2 v2] arm, arm64: change_memory_common with numpages == 0 should be no-op.

From: Mika Penttilä <mika.penttila@...tfour.com>

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@...aro.org>
applied.

Signed-off-by: Mika Penttilä mika.penttila@...tfour.com
Reviewed-by: Laura Abbott <labbott@...hat.com>
Acked-by: David Rientjes <rientjes@...gle.com>

---
 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