[PATCHv4 09/10] mm/usercopy: Switch to using lm_alias

[Laura Abbott]

The usercopy checking code currently calls __va(__pa(...)) to check for
aliases on symbols. Switch to using lm_alias instead.

Signed-off-by: Laura Abbott <labb...@redhat.com>
---
Found when reviewing the kernel. Tested.
---
 mm/usercopy.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/usercopy.c b/mm/usercopy.c
index 3c8da0a..8345299 100644
--- a/mm/usercopy.c
+++ b/mm/usercopy.c
@@ -108,13 +108,13 @@ static inline const char *check_kernel_text_object(const 
void *ptr,
         * __pa() is not just the reverse of __va(). This can be detected
         * and checked:
         */
-       textlow_linear = (unsigned long)__va(__pa(textlow));
+       textlow_linear = (unsigned long)lm_alias(textlow);
        /* No different mapping: we're done. */
        if (textlow_linear == textlow)
                return NULL;
 
        /* Check the secondary mapping... */
-       texthigh_linear = (unsigned long)__va(__pa(texthigh));
+       texthigh_linear = (unsigned long)lm_alias(texthigh);
        if (overlaps(ptr, n, textlow_linear, texthigh_linear))
                return "<linear kernel text>";
 
-- 
2.7.4