commit f474c8c857d996f34c39f66bbed23faaa739fad6
author Mika Penttilä <mika.penttila@nextfour.com> Mon Feb 22 17:56:52 2016 +0100
committer Russell King <rmk+kernel@arm.linux.org.uk> Fri Mar 04 23:32:45 2016 +0000
tree 0a0ae7bb3a9a7c405d6bba7cca7b75dabe5ea1fc
parent c7edd7f99cdaec65e9303b4c9edc19bb595564ed

ARM: 8544/1: set_memory_xx fixes

Allow zero size updates. This makes set_memory_xx() consistent with x86, s390 and arm64 and makes apply_to_page_range() not to BUG() when loading modules.

Signed-off-by: Mika Penttilä mika.penttila@nextfour.com
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mm/pageattr.c

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 @@
 		WARN_ON_ONCE(1);
 	}
 
+	if (!numpages)
+		return 0;
+
 	if (start < MODULES_VADDR || start >= MODULES_END)
 		return -EINVAL;