ipc: add msgrcv syscall/compat_syscall wrappers

Provide ksys_msgrcv() and compat_ksys_msgrcv() 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_msgrcv() and compat_sys_msgrcv().

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, 4 insertions, 4 deletions

diff --git a/ipc/syscall.c b/ipc/syscall.c
index aa29b0802e26..0228c7afd882 100644
--- a/ipc/syscall.c
+++ b/ipc/syscall.c
@@ -59,11 +59,11 @@ SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, unsigned long, second,
                                            (struct ipc_kludge __user *) ptr,
                                            sizeof(tmp)))
                                 return -EFAULT;
-                        return sys_msgrcv(first, tmp.msgp, second,
+                        return ksys_msgrcv(first, tmp.msgp, second,
                                            tmp.msgtyp, third);
                 }
                 default:
-                        return sys_msgrcv(first,
+                        return ksys_msgrcv(first,
                                            (struct msgbuf __user *) ptr,
                                            second, fifth, third);
                 }
@@ -156,10 +156,10 @@ COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second,
                                 return -EINVAL;
                         if (copy_from_user(&ipck, uptr, sizeof(ipck)))
                                 return -EFAULT;
-                        return compat_sys_msgrcv(first, ipck.msgp, second,
+                        return compat_ksys_msgrcv(first, ipck.msgp, second,
                                                  ipck.msgtyp, third);
                 }
-                return compat_sys_msgrcv(first, ptr, second, fifth, third);
+                return compat_ksys_msgrcv(first, ptr, second, fifth, third);
         }
         case MSGGET:
                 return ksys_msgget(first, second);