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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 <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
alistair/sensors
Jens Axboe 2019-12-25 22:14:54 -07:00
parent 4840e418c2
commit db08ca2525
2 changed files with 7 additions and 1 deletions
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1
include/linux/mm.h
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@ -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,

7
mm/madvise.c
View File

@ -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);
}