Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 4f8f769a authored by Jens Axboe's avatar Jens Axboe Committed by Charan Teja Reddy
Browse files

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.

Change-Id: I77394d51a06aeb36e0ba733787dbd71a8e06a582
Reviewed-by: default avatarPavel Begunkov <asml.silence@gmail.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
Git-commit: db08ca25253d56f1f76eb4b3fe32a7ac1fbab741
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Signed-off-by: default avatarCharan Teja Reddy <charante@codeaurora.org>
parent c2ac24a1

include/linux/mm.h

+1 −0
Original line number Diff line number Diff line
@@ -2348,6 +2348,7 @@ extern int __do_munmap(struct mm_struct *, unsigned long, size_t, 
		       struct list_head *uf, bool downgrade);

extern int do_munmap(struct mm_struct *, unsigned long, size_t,

		     struct list_head *uf);

extern int do_madvise(unsigned long start, size_t len_in, int behavior);



static inline unsigned long

do_mmap_pgoff(struct file *file, unsigned long addr,

mm/madvise.c

+6 −1
Original line number Diff line number Diff line
@@ -1050,7 +1050,7 @@ 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;
@@ -1147,3 +1147,8 @@ 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);

}