mm/madvise.c: use PAGE_ALIGN[ED] for range checking

Improve readability, no functional change.

Link: http://lkml.kernel.org/r/20191118032857.22683-1-richardw.yang@linux.intel.com
Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/madvise.c b/mm/madvise.c
index e808dbe..bcdb6a0 100644 (file)
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -1059,9 +1059,9 @@ SYSCALL_DEFINE3(madvise, unsigned long, start, size_t, len_in, int, behavior)
        if (!madvise_behavior_valid(behavior))
                return error;
 
-       if (start & ~PAGE_MASK)
+       if (!PAGE_ALIGNED(start))
                return error;
-       len = (len_in + ~PAGE_MASK) & PAGE_MASK;
+       len = PAGE_ALIGN(len_in);
 
        /* Check to see whether len was rounded up from small -ve to zero */
        if (len_in && !len)