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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>
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@ -2328,6 +2328,7 @@ extern int __do_munmap(struct mm_struct *, unsigned long, size_t,
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struct list_head *uf, bool downgrade);
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extern int do_munmap(struct mm_struct *, unsigned long, size_t,
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struct list_head *uf);
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extern int do_madvise(unsigned long start, size_t len_in, int behavior);
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static inline unsigned long
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do_mmap_pgoff(struct file *file, unsigned long addr,
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@ -1044,7 +1044,7 @@ madvise_behavior_valid(int behavior)
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* -EBADF - map exists, but area maps something that isn't a file.
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* -EAGAIN - a kernel resource was temporarily unavailable.
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*/
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SYSCALL_DEFINE3(madvise, unsigned long, start, size_t, len_in, int, behavior)
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int do_madvise(unsigned long start, size_t len_in, int behavior)
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{
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unsigned long end, tmp;
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struct vm_area_struct *vma, *prev;
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@ -1141,3 +1141,8 @@ out:
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return error;
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}
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SYSCALL_DEFINE3(madvise, unsigned long, start, size_t, len_in, int, behavior)
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{
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return do_madvise(start, len_in, behavior);
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}
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