From 41f4f0e2f5f4cd060885405c04214851ffe7b299 Mon Sep 17 00:00:00 2001 From: Dominik Brodowski Date: Tue, 20 Mar 2018 19:48:14 +0100 Subject: ipc: add semtimedop syscall/compat_syscall wrappers Provide ksys_semtimedop() and compat_ksys_semtimedop() wrappers to avoid in-kernel calls to these syscalls. The ksys_ prefix denotes that these functions are meant as a drop-in replacement for the syscalls. In particular, they use the same calling convention as sys_semtimedop() and compat_sys_semtimedop(). 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 Cc: Andrew Morton Signed-off-by: Dominik Brodowski --- ipc/sem.c | 23 ++++++++++++++++++----- 1 file changed, 18 insertions(+), 5 deletions(-) (limited to 'ipc/sem.c') diff --git a/ipc/sem.c b/ipc/sem.c index a4af04979fd2..e21ceb8b4af1 100644 --- a/ipc/sem.c +++ b/ipc/sem.c @@ -2120,8 +2120,8 @@ out_free: return error; } -SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsops, - unsigned, nsops, const struct timespec __user *, timeout) +long ksys_semtimedop(int semid, struct sembuf __user *tsops, + unsigned int nsops, const struct timespec __user *timeout) { if (timeout) { struct timespec64 ts; @@ -2132,10 +2132,16 @@ SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsops, return do_semtimedop(semid, tsops, nsops, NULL); } +SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsops, + unsigned int, nsops, const struct timespec __user *, timeout) +{ + return ksys_semtimedop(semid, tsops, nsops, timeout); +} + #ifdef CONFIG_COMPAT -COMPAT_SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsems, - unsigned, nsops, - const struct compat_timespec __user *, timeout) +long compat_ksys_semtimedop(int semid, struct sembuf __user *tsems, + unsigned int nsops, + const struct compat_timespec __user *timeout) { if (timeout) { struct timespec64 ts; @@ -2145,6 +2151,13 @@ COMPAT_SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsems, } return do_semtimedop(semid, tsems, nsops, NULL); } + +COMPAT_SYSCALL_DEFINE4(semtimedop, int, semid, struct sembuf __user *, tsems, + unsigned int, nsops, + const struct compat_timespec __user *, timeout) +{ + return compat_ksys_semtimedop(semid, tsems, nsops, timeout); +} #endif SYSCALL_DEFINE3(semop, int, semid, struct sembuf __user *, tsops, -- cgit v1.2.3-59-g8ed1b