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Subject[PATCH 14/45] fs: add do_compat_signalfd4() helper; remove in-kernel call to comapt syscall
Date
Using the fs-internal do_compat_signalfd4() helper allows us to get rid of
the fs-internal call to the compat_sys_signalfd4() 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: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
---
fs/signalfd.c | 17 ++++++++++++-----
1 file changed, 12 insertions(+), 5 deletions(-)

diff --git a/fs/signalfd.c b/fs/signalfd.c
index 501c41f3351f..d2187a813376 100644
--- a/fs/signalfd.c
+++ b/fs/signalfd.c
@@ -323,10 +323,9 @@ SYSCALL_DEFINE3(signalfd, int, ufd, sigset_t __user *, user_mask,
}

#ifdef CONFIG_COMPAT
-COMPAT_SYSCALL_DEFINE4(signalfd4, int, ufd,
- const compat_sigset_t __user *,sigmask,
- compat_size_t, sigsetsize,
- int, flags)
+static long do_compat_signalfd4(int ufd,
+ const compat_sigset_t __user *sigmask,
+ compat_size_t sigsetsize, int flags)
{
sigset_t tmp;
sigset_t __user *ksigmask;
@@ -342,10 +341,18 @@ COMPAT_SYSCALL_DEFINE4(signalfd4, int, ufd,
return do_signalfd4(ufd, ksigmask, sizeof(sigset_t), flags);
}

+COMPAT_SYSCALL_DEFINE4(signalfd4, int, ufd,
+ const compat_sigset_t __user *, sigmask,
+ compat_size_t, sigsetsize,
+ int, flags)
+{
+ return do_compat_signalfd4(ufd, sigmask, sigsetsize, flags);
+}
+
COMPAT_SYSCALL_DEFINE3(signalfd, int, ufd,
const compat_sigset_t __user *,sigmask,
compat_size_t, sigsetsize)
{
- return compat_sys_signalfd4(ufd, sigmask, sigsetsize, 0);
+ return do_compat_signalfd4(ufd, sigmask, sigsetsize, 0);
}
#endif
--
2.16.2
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