ipc: add msgsnd syscall/compat_syscall wrappers

Provide ksys_msgsnd() and compat_ksys_msgsnd() 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_msgsnd() and compat_sys_msgsnd().

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>

1 files changed, 2 insertions, 2 deletions

diff --git a/ipc/syscall.c b/ipc/syscall.c
index 0228c7afd882..77a883ef2eca 100644
--- a/ipc/syscall.c
+++ b/ipc/syscall.c
@@ -46,7 +46,7 @@ SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, unsigned long, second,
         }
 
         case MSGSND:
-                return sys_msgsnd(first, (struct msgbuf __user *) ptr,
+                return ksys_msgsnd(first, (struct msgbuf __user *) ptr,
                                   second, third);
         case MSGRCV:
                 switch (version) {
@@ -142,7 +142,7 @@ COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second,
                 return compat_ksys_semctl(first, second, third, pad);
 
         case MSGSND:
-                return compat_sys_msgsnd(first, ptr, second, third);
+                return compat_ksys_msgsnd(first, ptr, second, third);
 
         case MSGRCV: {
                 void __user *uptr = compat_ptr(ptr);