From: Heiko Carstens <heiko.carstens@de.ibm.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: y2038@lists.linaro.org, linux-api@vger.kernel.org,
linux-kernel@vger.kernel.org, ink@jurassic.park.msu.ru,
mattst88@gmail.com, linux@armlinux.org.uk,
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tony.luck@intel.com, fenghua.yu@intel.com, geert@linux-m68k.org,
monstr@monstr.eu, paul.burton@mips.com, deller@gmx.de,
mpe@ellerman.id.au, schwidefsky@de.ibm.com, dalias@libc.org,
davem@davemloft.net, luto@kernel.org, tglx@linutronix.de,
mingo@redhat.com, hpa@zytor.com, x86@kernel.org,
jcmvbkbc@gmail.com, firoz.khan@linaro.org, ebiederm@xmission.com,
deepa.kernel@gmail.com, linux@dominikbrodowski.net,
akpm@linux-foundation.org, dave@stgolabs.net,
linux-alpha@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org,
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linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
linux-s390@vger.kernel.org, linux-sh@vger.kernel.org,
sparclinux@vger.kernel.org
Subject: Re: [PATCH 14/15] arch: add split IPC system calls where needed
Date: Thu, 10 Jan 2019 21:32:53 +0100 [thread overview]
Message-ID: <20190110203253.GA3676@osiris> (raw)
In-Reply-To: <20190110162435.309262-15-arnd@arndb.de>
On Thu, Jan 10, 2019 at 05:24:34PM +0100, Arnd Bergmann wrote:
> 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 additon of a y2083 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>
> ---
> One aspect here that might be a bit controversial is the use of
> the same system call numbers across all architectures, synchronizing
> all of them with the x86-32 numbers. With the new syscall.tbl
> files, I hope we can just keep doing that in the future, and no
> longer require the architecture maintainers to assign a number.
>
> This is mainly useful for implementers of the C libraries: if
> we can add future system calls everywhere at the same time, using
> a particular version of the kernel headers also guarantees that
> the system call number macro is visible.
> diff --git a/arch/s390/kernel/syscalls/syscall.tbl b/arch/s390/kernel/syscalls/syscall.tbl
> index 022fc099b628..428cf512a757 100644
> --- a/arch/s390/kernel/syscalls/syscall.tbl
> +++ b/arch/s390/kernel/syscalls/syscall.tbl
> @@ -391,3 +391,15 @@
> 381 common kexec_file_load sys_kexec_file_load compat_sys_kexec_file_load
> 382 common io_pgetevents sys_io_pgetevents compat_sys_io_pgetevents
> 383 common rseq sys_rseq compat_sys_rseq
> +# room for arch specific syscalls
> +392 64 semtimedop sys_semtimedop -
> +393 common semget sys_semget sys_semget
...
> +395 common shmget sys_shmget sys_shmget
...
> +398 common shmdt sys_shmdt sys_shmdt
> +399 common msgget sys_msgget sys_msgget
These four need compat system call wrappers, unfortunately... (well,
actually only shmget and shmdt require them, but let's add them for
all four). See arch/s390/kernel/compat_wrapper.c
I'm afraid this compat special handling will be even more annoying in
the future, since s390 will be the only architecture which requires
this special handling.
_Maybe_ it would make sense to automatically generate a weak compat
system call wrapper for s390 with the SYSCALL_DEFINE macros, but that
probably won't work in all cases.
next prev parent reply other threads:[~2019-01-10 20:33 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-10 16:24 [PATCH 00/15] arch: synchronize syscall tables in preparation for y2038 Arnd Bergmann
2019-01-10 16:24 ` [PATCH 01/15] ia64: add __NR_umount2 definition Arnd Bergmann
2019-01-10 16:24 ` [PATCH 02/15] ia64: add statx and io_pgetevents syscalls Arnd Bergmann
2019-01-10 16:24 ` [PATCH 03/15] ia64: assign syscall numbers for perf and seccomp Arnd Bergmann
2019-01-10 16:24 ` [PATCH 04/15] alpha: wire up io_pgetevents system call Arnd Bergmann
2019-01-10 16:24 ` [PATCH 05/15] alpha: update syscall macro definitions Arnd Bergmann
2019-01-10 16:24 ` [PATCH 06/15] ARM: add migrate_pages() system call Arnd Bergmann
2019-01-10 16:32 ` Will Deacon
2019-01-10 17:11 ` Arnd Bergmann
2019-01-10 16:24 ` [PATCH 07/15] ARM: add kexec_file_load system call number Arnd Bergmann
2019-01-10 16:39 ` Will Deacon
2019-01-10 17:14 ` Arnd Bergmann
2019-01-10 16:24 ` [PATCH 08/15] m68k: assign syscall number for seccomp Arnd Bergmann
2019-01-10 16:24 ` [PATCH 09/15] sh: remove duplicate unistd_32.h file Arnd Bergmann
2019-01-10 16:24 ` [PATCH 10/15] sh: add statx system call Arnd Bergmann
2019-01-10 16:24 ` [PATCH 11/15] mips: fix n32 compat_ipc_parse_version Arnd Bergmann
2019-01-10 16:24 ` [PATCH 12/15] sparc64: fix sparc_ipc type conversion Arnd Bergmann
2019-01-10 16:24 ` [PATCH 13/15] ipc: rename old-style shmctl/semctl/msgctl syscalls Arnd Bergmann
2019-01-10 16:24 ` [PATCH 14/15] arch: add split IPC system calls where needed Arnd Bergmann
2019-01-10 20:32 ` Heiko Carstens [this message]
2019-01-11 17:33 ` Arnd Bergmann
2019-01-14 3:40 ` Michael Ellerman
2019-01-14 3:59 ` Michael Ellerman
2019-01-14 9:58 ` Michael Ellerman
2019-01-15 15:01 ` Arnd Bergmann
2019-01-15 15:18 ` Arnd Bergmann
2019-01-15 16:35 ` Geert Uytterhoeven
2019-01-15 21:24 ` Arnd Bergmann
2019-01-16 0:09 ` Michael Ellerman
2019-01-16 0:10 ` Michael Ellerman
2019-01-10 16:24 ` [PATCH 15/15] arch: add pkey and rseq syscall numbers everywhere Arnd Bergmann
2019-01-10 20:36 ` Heiko Carstens
2019-01-11 17:30 ` Arnd Bergmann
2019-01-14 8:31 ` Heiko Carstens
2019-01-15 11:52 ` Russell King - ARM Linux admin
2019-01-15 14:47 ` Arnd Bergmann
2019-01-10 16:59 ` [PATCH 00/15] arch: synchronize syscall tables in preparation for y2038 Geert Uytterhoeven
2019-01-10 17:06 ` Arnd Bergmann
2019-01-10 18:11 ` Geert Uytterhoeven
2019-01-10 22:43 ` Arnd Bergmann
2019-01-11 8:07 ` Geert Uytterhoeven
2019-01-10 18:10 ` Joseph Myers
2019-01-10 22:42 ` Arnd Bergmann
2019-01-10 23:14 ` Michael Cree
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