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| author | Dominik Brodowski <linux@dominikbrodowski.net> | 2018-03-18 09:53:04 +0300 |
|---|---|---|
| committer | Dominik Brodowski <linux@dominikbrodowski.net> | 2018-04-02 21:15:41 +0300 |
| commit | 4bdb9acabff2dfcb856c40b6936269d87f490c8d (patch) | |
| tree | 092709ef63f16f414fb83a03b15bccedda5e37ff | |
| parent | 30cfe4ef8b8948842a48de7955ca0522568eeb6d (diff) | |
| download | linux-4bdb9acabff2dfcb856c40b6936269d87f490c8d.tar.xz | |
fs: add kern_select() helper; remove in-kernel call to sys_select()
Using this helper allows us to avoid the in-kernel call to the sys_umount()
syscall.
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: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
| -rw-r--r-- | fs/select.c | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/fs/select.c b/fs/select.c index b6c36254028a..b5df01c4587d 100644 --- a/fs/select.c +++ b/fs/select.c @@ -675,8 +675,8 @@ out_nofds: return ret; } -SYSCALL_DEFINE5(select, int, n, fd_set __user *, inp, fd_set __user *, outp, - fd_set __user *, exp, struct timeval __user *, tvp) +static int kern_select(int n, fd_set __user *inp, fd_set __user *outp, + fd_set __user *exp, struct timeval __user *tvp) { struct timespec64 end_time, *to = NULL; struct timeval tv; @@ -699,6 +699,12 @@ SYSCALL_DEFINE5(select, int, n, fd_set __user *, inp, fd_set __user *, outp, return ret; } +SYSCALL_DEFINE5(select, int, n, fd_set __user *, inp, fd_set __user *, outp, + fd_set __user *, exp, struct timeval __user *, tvp) +{ + return kern_select(n, inp, outp, exp, tvp); +} + static long do_pselect(int n, fd_set __user *inp, fd_set __user *outp, fd_set __user *exp, struct timespec __user *tsp, const sigset_t __user *sigmask, size_t sigsetsize) @@ -784,7 +790,7 @@ SYSCALL_DEFINE1(old_select, struct sel_arg_struct __user *, arg) if (copy_from_user(&a, arg, sizeof(a))) return -EFAULT; - return sys_select(a.n, a.inp, a.outp, a.exp, a.tvp); + return kern_select(a.n, a.inp, a.outp, a.exp, a.tvp); } #endif |