From: Wei Yang <richardw.yang@xxxxxxxxxxxxxxx> Subject: 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@xxxxxxxxxxxxxxx Signed-off-by: Wei Yang <richardw.yang@xxxxxxxxxxxxxxx> Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/madvise.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) --- a/mm/madvise.c~madvise-use-page_align-for-range-checking +++ a/mm/madvise.c @@ -1059,9 +1059,9 @@ SYSCALL_DEFINE3(madvise, unsigned long, 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) _
