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arch: add split IPC system calls where needed

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The IPC system call handling is highly inconsistent across architectures,
some use sys_ipc, some use separate calls, and some use both.  We also
have some architectures that require passing IPC_64 in the flags, and
others that set it implicitly.

For the addition of a y2038 safe semtimedop() system call, I chose to only
support the separate entry points, but that requires first supporting
the regular ones with their own syscall numbers.

The IPC_64 is now implied by the new semctl/shmctl/msgctl system
calls even on the architectures that require passing it with the ipc()
multiplexer.

I'm not adding the new semtimedop() or semop() on 32-bit architectures,
those will get implemented using the new semtimedop_time64() version
that gets added along with the other time64 calls.
Three 64-bit architectures (powerpc, s390 and sparc) get semtimedop().

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Heiko Carstens <heiko.carstens@de.ibm.com>
This commit is contained in:
Arnd Bergmann
2018-12-31 14:38:26 +01:00
parent 275f22148e
commit 0d6040d468
9 changed files with 84 additions and 0 deletions
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13
arch/powerpc/kernel/syscalls/syscall.tbl
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@@ -414,6 +414,7 @@
363 spu switch_endian sys_ni_syscall
364 common userfaultfd sys_userfaultfd
365 common membarrier sys_membarrier
# 366-377 originally left for IPC, now unused
378 nospu mlock2 sys_mlock2
379 nospu copy_file_range sys_copy_file_range
380 common preadv2 sys_preadv2 compat_sys_preadv2
@@ -425,3 +426,15 @@
386 nospu pkey_mprotect sys_pkey_mprotect
387 nospu rseq sys_rseq
388 nospu io_pgetevents sys_io_pgetevents compat_sys_io_pgetevents
# room for arch specific syscalls
392 64 semtimedop sys_semtimedop
393 common semget sys_semget
394 common semctl sys_semctl compat_sys_semctl
395 common shmget sys_shmget
396 common shmctl sys_shmctl compat_sys_shmctl
397 common shmat sys_shmat compat_sys_shmat
398 common shmdt sys_shmdt
399 common msgget sys_msgget
400 common msgsnd sys_msgsnd compat_sys_msgsnd
401 common msgrcv sys_msgrcv compat_sys_msgrcv
402 common msgctl sys_msgctl compat_sys_msgctl