From 1fd6ac86e33bec9feb953053591d9286afbdd12a Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Wed, 25 Dec 2019 22:14:54 -0700 Subject: [PATCH] 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 Signed-off-by: Jens Axboe --- include/linux/mm.h | 1 + mm/madvise.c | 7 ++++++- 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index cfaa8feecfe86..b4ba5b3bb54b4 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 bcdb6a0427879..43b47d3fae02e 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); +} -- 2.39.5