ARM: 8544/1: set_memory_xx fixes

Mika Penttilä · Russell King · commit f474c8c857d9 · 2016-03-04T23:32:45.000Z
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 &lt;rmk+kernel@arm.linux.org.uk&gt;
diff --git 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;
 

Original file line number	Diff line number	Diff line change
`@@ -49,6 +49,9 @@ static int change_memory_common(unsigned long addr, int numpages,`
`49`	`49`	`WARN_ON_ONCE(1);`
`50`	`50`	`}`
`51`	`51`
	`52`	`+ if (!numpages)`
	`53`	`+ return 0;`
	`54`	`+`
`52`	`55`	`if (start < MODULES_VADDR \|\| start >= MODULES_END)`
`53`	`56`	`return -EINVAL;`
`54`	`57`