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Date: Wed, 16 Jan 2019 11:10:16 +1100 From: Michael Ellerman <mpe@...erman.id.au> To: Arnd Bergmann <arnd@...db.de> Cc: y2038 Mailman List <y2038@...ts.linaro.org>, Linux API <linux-api@...r.kernel.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Ivan Kokshaysky <ink@...assic.park.msu.ru>, Matt Turner <mattst88@...il.com>, Russell King - ARM Linux <linux@...linux.org.uk>, Catalin Marinas <catalin.marinas@....com>, Will Deacon <will.deacon@....com>, Tony Luck <tony.luck@...el.com>, Fenghua Yu <fenghua.yu@...el.com>, Geert Uytterhoeven <geert@...ux-m68k.org>, Michal Simek <monstr@...str.eu>, Paul Burton <paul.burton@...s.com>, Helge Deller <deller@....de>, Martin Schwidefsky <schwidefsky@...ibm.com>, Heiko Carstens <heiko.carstens@...ibm.com>, Rich Felker <dalias@...c.org>, David Miller <davem@...emloft.net>, Andy Lutomirski <luto@...nel.org>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>, the arch/x86 maintainers <x86@...nel.org>, Max Filippov <jcmvbkbc@...il.com>, Firoz Khan <firoz.khan@...aro.org>, "Eric W . Biederman" <ebiederm@...ssion.com>, Deepa Dinamani <deepa.kernel@...il.com>, Dominik Brodowski <linux@...inikbrodowski.net>, Andrew Morton <akpm@...ux-foundation.org>, Davidlohr Bueso <dave@...olabs.net>, alpha <linux-alpha@...r.kernel.org>, Linux ARM <linux-arm-kernel@...ts.infradead.org>, linux-ia64@...r.kernel.org, linux-m68k <linux-m68k@...ts.linux-m68k.org>, linux-mips@...r.kernel.org, Parisc List <linux-parisc@...r.kernel.org>, linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>, linux-s390 <linux-s390@...r.kernel.org>, Linux-sh list <linux-sh@...r.kernel.org>, sparclinux <sparclinux@...r.kernel.org> Subject: Re: [PATCH 14/15] arch: add split IPC system calls where needed Arnd Bergmann <arnd@...db.de> writes: > On Mon, Jan 14, 2019 at 4:59 AM Michael Ellerman <mpe@...erman.id.au> wrote: >> Arnd Bergmann <arnd@...db.de> writes: >> > arch/m68k/kernel/syscalls/syscall.tbl | 11 +++++++++++ >> > arch/mips/kernel/syscalls/syscall_o32.tbl | 11 +++++++++++ >> > arch/powerpc/kernel/syscalls/syscall.tbl | 12 ++++++++++++ >> >> I have some changes I'd like to make to our syscall table that will >> clash with this. >> >> I'll try and send them today. > > Ok. Are those for 5.0 or 5.1? If they are intended for 5.0, it would be > nice for me to have a branch based on 5.0-rc1 that I can put > the other patches on top of. For 5.1. I can put them in a topic branch for you. >> > diff --git a/arch/powerpc/kernel/syscalls/syscall.tbl b/arch/powerpc/kernel/syscalls/syscall.tbl >> > index db3bbb8744af..1bffab54ff35 100644 >> > --- a/arch/powerpc/kernel/syscalls/syscall.tbl >> > +++ b/arch/powerpc/kernel/syscalls/syscall.tbl >> > @@ -425,3 +425,15 @@ >> > 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 >> >> We already have a gap at 366-377 from when we tried to add the split IPC >> calls a few years back. >> >> I guess I don't mind leaving that gap and using the common numbers as >> you've done here. >> >> But it would be good to add a comment pointing out that we have room >> at 366 for more arch specific syscalls as well. > > Ah, I missed that. I've added this to my patch now: > > index 5c0936d862fc..2ddfba536d5f 100644 > --- a/arch/powerpc/kernel/syscalls/syscall.tbl > +++ b/arch/powerpc/kernel/syscalls/syscall.tbl > @@ -460,6 +460,7 @@ > 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 Thanks. cheers
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