linux-kernel - [PATCH 16/45] inotify: add do_inotify_init() helper; remove in-kernel call to syscall

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Message-Id: <20180322090059.19361-17-linux@dominikbrodowski.net>
Date:   Thu, 22 Mar 2018 10:00:30 +0100
From:   Dominik Brodowski <linux@...inikbrodowski.net>
To:     linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
        viro@...IV.linux.org.uk, arnd@...db.de, linux-arch@...r.kernel.org
Cc:     Jan Kara <jack@...e.cz>, Amir Goldstein <amir73il@...il.com>,
        linux-fsdevel@...r.kernel.org
Subject: [PATCH 16/45] inotify: add do_inotify_init() helper; remove in-kernel call to syscall

Using the inotify-internal do_inotify_init() helper allows us to get rid
of the in-kernel call to sys_inotify_init1() syscall.

This patch is part of a series which tries to remove in-kernel calls to
syscalls. On this basis, the syscall entry path can be streamlined.

Cc: Jan Kara <jack@...e.cz>
Cc: Amir Goldstein <amir73il@...il.com>
Cc: linux-fsdevel@...r.kernel.org
Signed-off-by: Dominik Brodowski <linux@...inikbrodowski.net>
---
 fs/notify/inotify/inotify_user.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c
index 2c908b31d6c9..43c23653ce2e 100644
--- a/fs/notify/inotify/inotify_user.c
+++ b/fs/notify/inotify/inotify_user.c
@@ -635,7 +635,7 @@ static struct fsnotify_group *inotify_new_group(unsigned int max_events)
 
 
 /* inotify syscalls */
-SYSCALL_DEFINE1(inotify_init1, int, flags)
+static int do_inotify_init(int flags)
 {
 	struct fsnotify_group *group;
 	int ret;
@@ -660,9 +660,14 @@ SYSCALL_DEFINE1(inotify_init1, int, flags)
 	return ret;
 }
 
+SYSCALL_DEFINE1(inotify_init1, int, flags)
+{
+	return do_inotify_init(flags);
+}
+
 SYSCALL_DEFINE0(inotify_init)
 {
-	return sys_inotify_init1(0);
+	return do_inotify_init(0);
 }
 
 SYSCALL_DEFINE3(inotify_add_watch, int, fd, const char __user *, pathname,
-- 
2.16.2