| From | Dominik Brodowski <> | Subject | [PATCH 14/45] fs: add do_compat_signalfd4() helper; remove in-kernel call to comapt syscall | Date | Thu, 22 Mar 2018 10:00:28 +0100 |
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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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