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>

diff --git a/arch/arm/mm/pageattr.c b/arch/arm/mm/pageattr.c
index cf30daff8932504f95422c2aa3b5882b154713b5..d19b1ad29b075fd8624d34edb0d9c18c9ef11e51 100644 (file)
--- 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;