[PATCH] ARM: Remove address checking for MMUless devices

[Yanjun Yang]

Commit 169f9102f9198b ("ARM: 9350/1: fault:
Implement copy_from_kernel_nofault_allowed()") added the function to check
address before use. However, for devices without MMU, addr > TASK_SIZE
will always fail.  This patch move this function after the #ifdef
CONFIG_MMU statement.

Also reported at https://bugzilla.kernel.org/show_bug.cgi?id=218953

Signed-off-by: Yanjun Yang <yangyj.ee at gmail.com>
---
 arch/arm/mm/fault.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
index 67c425341a95..ab01b51de559 100644
--- a/arch/arm/mm/fault.c
+++ b/arch/arm/mm/fault.c
@@ -25,6 +25,8 @@
 
 #include "fault.h"
 
+#ifdef CONFIG_MMU
+
 bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size)
 {
 	unsigned long addr = (unsigned long)unsafe_src;
@@ -32,8 +34,6 @@ bool copy_from_kernel_nofault_allowed(const void *unsafe_src, size_t size)
 	return addr >= TASK_SIZE && ULONG_MAX - addr >= size;
 }
 
-#ifdef CONFIG_MMU
-
 /*
  * This is useful to dump out the page tables associated with
  * 'addr' in mm 'mm'.
-- 
2.45.2