From da1e2744341542e404c172bcf6a321f509408b14 Mon Sep 17 00:00:00 2001 From: Dominik Brodowski Date: Tue, 20 Mar 2018 20:09:48 +0100 Subject: ipc: add shmdt syscall wrapper Provide ksys_shmdt() wrapper to avoid in-kernel calls to this syscall. The ksys_ prefix denotes that this function is meant as a drop-in replacement for the syscall. In particular, it uses the same calling convention as sys_shmdt(). 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/shm.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'ipc/shm.c') diff --git a/ipc/shm.c b/ipc/shm.c index 9f3cdb259a51..e5838e3328dc 100644 --- a/ipc/shm.c +++ b/ipc/shm.c @@ -1481,7 +1481,7 @@ COMPAT_SYSCALL_DEFINE3(shmat, int, shmid, compat_uptr_t, shmaddr, int, shmflg) * detach and kill segment if marked destroyed. * The work is done in shm_close. */ -SYSCALL_DEFINE1(shmdt, char __user *, shmaddr) +long ksys_shmdt(char __user *shmaddr) { struct mm_struct *mm = current->mm; struct vm_area_struct *vma; @@ -1588,6 +1588,11 @@ SYSCALL_DEFINE1(shmdt, char __user *, shmaddr) return retval; } +SYSCALL_DEFINE1(shmdt, char __user *, shmaddr) +{ + return ksys_shmdt(shmaddr); +} + #ifdef CONFIG_PROC_FS static int sysvipc_shm_proc_show(struct seq_file *s, void *it) { -- cgit v1.2.3