ipc: rename old-style shmctl/semctl/msgctl syscalls

The behavior of these system calls is slightly different between
architectures, as determined by the CONFIG_ARCH_WANT_IPC_PARSE_VERSION
symbol. Most architectures that implement the split IPC syscalls don't set
that symbol and only get the modern version, but alpha, arm, microblaze,
mips-n32, mips-n64 and xtensa expect the caller to pass the IPC_64 flag.

For the architectures that so far only implement sys_ipc(), i.e. m68k,
mips-o32, powerpc, s390, sh, sparc, and x86-32, we want the new behavior
when adding the split syscalls, so we need to distinguish between the
two groups of architectures.

The method I picked for this distinction is to have a separate system call
entry point: sys_old_*ctl() now uses ipc_parse_version, while sys_*ctl()
does not. The system call tables of the five architectures are changed
accordingly.

As an additional benefit, we no longer need the configuration specific
definition for ipc_parse_version(), it always does the same thing now,
but simply won't get called on architectures with the modern interface.

A small downside is that on architectures that do set
ARCH_WANT_IPC_PARSE_VERSION, we now have an extra set of entry points
that are never called. They only add a few bytes of bloat, so it seems
better to keep them compared to adding yet another Kconfig symbol.
I considered adding new syscall numbers for the IPC_64 variants for
consistency, but decided against that for now.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

1 files changed, 3 insertions, 3 deletions

diff --git a/arch/microblaze/kernel/syscalls/syscall.tbl b/arch/microblaze/kernel/syscalls/syscall.tbl
index a24d09e937dd..7cc0f9554da3 100644
--- a/arch/microblaze/kernel/syscalls/syscall.tbl
+++ b/arch/microblaze/kernel/syscalls/syscall.tbl
@@ -335,15 +335,15 @@
 325	common	semtimedop			sys_semtimedop
 326	common	timerfd_settime			sys_timerfd_settime
 327	common	timerfd_gettime			sys_timerfd_gettime
-328	common	semctl				sys_semctl
+328	common	semctl				sys_old_semctl
 329	common	semget				sys_semget
 330	common	semop				sys_semop
-331	common	msgctl				sys_msgctl
+331	common	msgctl				sys_old_msgctl
 332	common	msgget				sys_msgget
 333	common	msgrcv				sys_msgrcv
 334	common	msgsnd				sys_msgsnd
 335	common	shmat				sys_shmat
-336	common	shmctl				sys_shmctl
+336	common	shmctl				sys_old_shmctl
 337	common	shmdt				sys_shmdt
 338	common	shmget				sys_shmget
 339	common	signalfd4			sys_signalfd4