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fs: add do_signalfd4() helper; remove internal calls to sys_signalfd4() 

Using this helper removes in-kernel calls to the sys_signalfd4() syscall
function.

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>
This commit is contained in:
Dominik Brodowski 2018-03-11 11:34:36 +01:00
parent 791eb22eef
commit 52fb6db0fd
1 changed files with 10 additions and 4 deletions
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14
fs/signalfd.c
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@ -256,8 +256,8 @@ static const struct file_operations signalfd_fops = {
.llseek = noop_llseek,
};
SYSCALL_DEFINE4(signalfd4, int, ufd, sigset_t __user *, user_mask,
size_t, sizemask, int, flags)
static int do_signalfd4(int ufd, sigset_t __user *user_mask, size_t sizemask,
int flags)
{
sigset_t sigmask;
struct signalfd_ctx *ctx;
@ -310,10 +310,16 @@ SYSCALL_DEFINE4(signalfd4, int, ufd, sigset_t __user *, user_mask,
return ufd;
}
SYSCALL_DEFINE4(signalfd4, int, ufd, sigset_t __user *, user_mask,
size_t, sizemask, int, flags)
{
return do_signalfd4(ufd, user_mask, sizemask, flags);
}
SYSCALL_DEFINE3(signalfd, int, ufd, sigset_t __user *, user_mask,
size_t, sizemask)
{
return sys_signalfd4(ufd, user_mask, sizemask, 0);
return do_signalfd4(ufd, user_mask, sizemask, 0);
}
#ifdef CONFIG_COMPAT
@ -333,7 +339,7 @@ COMPAT_SYSCALL_DEFINE4(signalfd4, int, ufd,
if (copy_to_user(ksigmask, &tmp, sizeof(sigset_t)))
return -EFAULT;
return sys_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
return do_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
}
COMPAT_SYSCALL_DEFINE3(signalfd, int, ufd,