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authorDominik Brodowski <linux@dominikbrodowski.net>2018-03-20 19:36:46 +0100
committerDominik Brodowski <linux@dominikbrodowski.net>2018-04-02 20:15:43 +0200
commit570484bfe813fa67da003077898a7046767cb4d1 (patch)
tree31ba785143b4d703cc6261360bc2b31fe252a24c /fs/signalfd.c
parent05585e449572d7bdb798a87a732f86760c6b3c77 (diff)
downloadlinux-stericsson-570484bfe813fa67da003077898a7046767cb4d1.tar.gz
fs: add do_compat_signalfd4() helper; remove in-kernel call to compat syscall
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 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>
Diffstat (limited to 'fs/signalfd.c')
-rw-r--r--fs/signalfd.c17
1 files 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