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ipc: add shmctl syscall/compat_syscall wrappers

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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>
This commit is contained in:
Dominik Brodowski
2018-03-20 20:12:33 +01:00
parent da1e274434
commit c84d0791df
3 changed files with 16 additions and 4 deletions
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4
ipc/syscall.c
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@@ -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;