[PATCH v2 05/36] fs: add do_readlinkat() helper; remove internal call to sys_readlinkat()

[Dominik Brodowski]

Using the do_readlinkat() helper removes an in-kernel call to the
sys_readlinkat() syscall.

Cc: Alexander Viro <v...@zeniv.linux.org.uk>
Signed-off-by: Dominik Brodowski <li...@dominikbrodowski.net>
---
 fs/stat.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/fs/stat.c b/fs/stat.c
index 873785dae022..f8e6fb2c3657 100644
--- a/fs/stat.c
+++ b/fs/stat.c
@@ -379,8 +379,8 @@ SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat 
__user *, statbuf)
        return error;
 }
 
-SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
-               char __user *, buf, int, bufsiz)
+static int do_readlinkat(int dfd, const char __user *pathname,
+                        char __user *buf, int bufsiz)
 {
        struct path path;
        int error;
@@ -415,10 +415,16 @@ SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user 
*, pathname,
        return error;
 }
 
+SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
+               char __user *, buf, int, bufsiz)
+{
+       return do_readlinkat(dfd, pathname, buf, bufsiz);
+}
+
 SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf,
                int, bufsiz)
 {
-       return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
+       return do_readlinkat(AT_FDCWD, path, buf, bufsiz);
 }
 
 
-- 
2.16.2