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| author | Jens Axboe <axboe@kernel.dk> | 2019-12-25 22:14:54 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2020-01-20 17:04:02 -0700 |
| commit | db08ca25253d56f1f76eb4b3fe32a7ac1fbab741 (patch) | |
| tree | dbc1e5c53c3ad54c4841441c8bff13484d034f06 | |
| parent | 4840e418c2fc533d55ff6caa5b9313eed1d26cfd (diff) | |
| download | lwn-db08ca25253d56f1f76eb4b3fe32a7ac1fbab741.tar.gz lwn-db08ca25253d56f1f76eb4b3fe32a7ac1fbab741.zip | |
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>
| -rw-r--r-- | include/linux/mm.h | 1 | ||||
| -rw-r--r-- | mm/madvise.c | 7 |
2 files changed, 7 insertions, 1 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index cfaa8feecfe8..b4ba5b3bb54b 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -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, diff --git a/mm/madvise.c b/mm/madvise.c index bcdb6a042787..43b47d3fae02 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 @@ out: return error; } + +SYSCALL_DEFINE3(madvise, unsigned long, start, size_t, len_in, int, behavior) +{ + return do_madvise(start, len_in, behavior); +} |