Commit db08ca25 authored by Jens Axboe's avatar Jens Axboe
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.

Reviewed-by: default avatarPavel Begunkov <asml.silence@gmail.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 4840e418

include/linux/mm.h

+1 −0
Original line number Diff line number Diff line
@@ -2328,6 +2328,7 @@ 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
@@ -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 @@ out: 


	return error;

}



SYSCALL_DEFINE3(madvise, unsigned long, start, size_t, len_in, int, behavior)

{

	return do_madvise(start, len_in, behavior);

}

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