mm: make do_madvise() available internally
This is in preparation for enabling this functionality through io_uring.
Add a helper that is just exporting what sys_madvise() does, and have the
system call use it.
No functional changes in this patch.
Reviewed-by: Pavel Begunkov <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
diff --git a/mm/madvise.c b/mm/madvise.c
index bcdb6a0..43b47d3 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -1044,7 +1044,7 @@ madvise_behavior_valid(int behavior)
* -EBADF - map exists, but area maps something that isn't a file.
* -EAGAIN - a kernel resource was temporarily unavailable.
*/
-SYSCALL_DEFINE3(madvise, unsigned long, start, size_t, len_in, int, behavior)
+int do_madvise(unsigned long start, size_t len_in, int behavior)
{
unsigned long end, tmp;
struct vm_area_struct *vma, *prev;
@@ -1141,3 +1141,8 @@ SYSCALL_DEFINE3(madvise, unsigned long, start, size_t, len_in, int, behavior)
return error;
}
+
+SYSCALL_DEFINE3(madvise, unsigned long, start, size_t, len_in, int, behavior)
+{
+ return do_madvise(start, len_in, behavior);
+}
