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From: Jens Axboe <axboe@kernel.dk>
To: io-uring@vger.kernel.org
Cc: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
	Jens Axboe <axboe@kernel.dk>
Subject: [PATCH 2/3] mm: make do_madvise() available internally
Date: Fri, 10 Jan 2020 08:47:38 -0700
Message-ID: <20200110154739.2119-3-axboe@kernel.dk> (raw)
In-Reply-To: <20200110154739.2119-1-axboe@kernel.dk>

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.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 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 80a9162b406c..766cad8aaa60 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 @@ SYSCALL_DEFINE3(madvise, unsigned long, start, size_t, len_in, int, behavior)
 
 	return error;
 }
+
+SYSCALL_DEFINE3(madvise, unsigned long, start, size_t, len_in, int, behavior)
+{
+	return do_madvise(start, len_in, behavior);
+}
-- 
2.24.1


  parent reply index

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-01-10 15:47 [PATCHSET 0/3] io_uring: add support for madvise/fadvise Jens Axboe
2020-01-10 15:47 ` [PATCH 1/3] io_uring: add IORING_OP_FADVISE Jens Axboe
2020-01-10 15:47 ` Jens Axboe [this message]
2020-01-10 15:47 ` [PATCH 3/3] io_uring: add IORING_OP_MADVISE Jens Axboe
2020-01-11 23:10   ` Kirill A. Shutemov
2020-01-12  2:16     ` Jens Axboe
2020-01-12 21:39   ` Pavel Begunkov
2020-01-13 16:58     ` Jens Axboe

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