ipc: add shmctl syscall/compat_syscall wrappers

Provide ksys_shmctl() and compat_ksys_shmctl() 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_shmctl() and compat_sys_shmctl().

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 b3aa71564815..34bbabc9e672 100644
--- a/ipc/syscall.c
+++ b/ipc/syscall.c
@@ -94,7 +94,7 @@ SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, unsigned long, second,
         case SHMGET:
                 return ksys_shmget(first, second, third);
         case SHMCTL:
-                return sys_shmctl(first, second,
+                return ksys_shmctl(first, second,
                                    (struct shmid_ds __user *) ptr);
         default:
                 return -ENOSYS;
@@ -182,7 +182,7 @@ COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second,
         case SHMGET:
                 return ksys_shmget(first, (unsigned int)second, third);
         case SHMCTL:
-                return compat_sys_shmctl(first, second, compat_ptr(ptr));
+                return compat_ksys_shmctl(first, second, compat_ptr(ptr));
         }
 
         return -ENOSYS;