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| author | Dominik Brodowski <linux@dominikbrodowski.net> | 2018-03-11 11:34:40 +0100 |
|---|---|---|
| committer | Dominik Brodowski <linux@dominikbrodowski.net> | 2018-04-02 20:15:49 +0200 |
| commit | c7248321a3d42ffba78db0dde88d1c49ca1c045f (patch) | |
| tree | ecd2b86a077f764e200b3c214cd1f851d4e3c6e0 /init/do_mounts_initrd.c | |
| parent | 3a18ef5c1b3935cb05888fc37964321f7bd6231d (diff) | |
| download | lwn-c7248321a3d42ffba78db0dde88d1c49ca1c045f.tar.gz lwn-c7248321a3d42ffba78db0dde88d1c49ca1c045f.zip | |
fs: add ksys_dup{,3}() helper; remove in-kernel calls to sys_dup{,3}()
Using ksys_dup() and ksys_dup3() as helper functions allows us to
avoid the in-kernel calls to the sys_dup() and sys_dup3() syscalls.
The ksys_ prefix denotes that these functions are meant as a drop-in
replacement for the syscalls. In particular, they use the same
calling convention as sys_dup{,3}().
In the near future, the fs-external callers of ksys_dup{,3}() should be
converted to call do_dup2() directly. Then, ksys_dup{,3}() can be moved
within sys_dup{,3}() again.
This patch is part of a series which removes in-kernel calls to syscalls.
On this basis, the syscall entry path can be streamlined. For details, see
http://lkml.kernel.org/r/20180325162527.GA17492@light.dominikbrodowski.net
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
Diffstat (limited to 'init/do_mounts_initrd.c')
| -rw-r--r-- | init/do_mounts_initrd.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/init/do_mounts_initrd.c b/init/do_mounts_initrd.c index 1c4da8353332..e8573e1776f6 100644 --- a/init/do_mounts_initrd.c +++ b/init/do_mounts_initrd.c @@ -39,8 +39,8 @@ static int init_linuxrc(struct subprocess_info *info, struct cred *new) sys_unshare(CLONE_FS | CLONE_FILES); /* stdin/stdout/stderr for /linuxrc */ sys_open("/dev/console", O_RDWR, 0); - sys_dup(0); - sys_dup(0); + ksys_dup(0); + ksys_dup(0); /* move initrd over / and chdir/chroot in initrd root */ sys_chdir("/root"); ksys_mount(".", "/", NULL, MS_MOVE, NULL); |