Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation helpers

From	Andy Lutomirski <luto@amacapital.net>
Newsgroups	linux.kernel
Subject	Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation helpers
Date	2016-03-12 19:20 +0100
Message-ID	<rbWiS-1L9-17@gated-at.bofh.it> (permalink)
References	<raB6O-IC-19@gated-at.bofh.it> <raQyU-2Yq-21@gated-at.bofh.it> <raTQ7-5hW-21@gated-at.bofh.it>
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On Wed, Mar 9, 2016 at 1:19 PM, Andy Lutomirski <luto@amacapital.net> wrote:
> On Wed, Mar 9, 2016 at 9:58 AM, Andy Lutomirski <luto@amacapital.net> wrote:
>> On Tue, Mar 8, 2016 at 5:24 PM, Andy Lutomirski <luto@kernel.org> wrote:
>>> musl implements system call cancellation in an unusual but clever way.
>>> When a thread issues a cancellable syscall, musl issues the syscall
>>> through a special thunk that looks roughly like this:
>>>
>>
>> FWIW, this patch fails disastrously on 64-bit kernels.  I fixed it,
>> but it needs kbuild changes.  I'll send those out to the maintainers.
>
> This version should be okay:
>
> https://git.kernel.org/cgit/linux/kernel/git/luto/linux.git/commit/?h=x86/vdso&id=fed6d35d3941bc53896ab80b5c8d68d54cc00347
>
> You'll need the parent, too, if you want to test.  I'm going to give
> the 0day bot a good long chew, since the parent change is a little bit
> scary.

Nope, that version was also not okay.  But the version currently in
that branch has survived the kbuild bot for a while now.

Yikes our build process for usermode code sucks.

--Andy

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[RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation helpers Andy Lutomirski <luto@kernel.org> - 2016-03-09 02:30 +0100
  Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation helpers Ingo Molnar <mingo@kernel.org> - 2016-03-09 10:00 +0100
    Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation  helpers Szabolcs Nagy <nsz@port70.net> - 2016-03-09 12:40 +0100
      Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation  helpers Szabolcs Nagy <nsz@port70.net> - 2016-03-09 12:50 +0100
      Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation helpers Linus Torvalds <torvalds@linux-foundation.org> - 2016-03-09 20:50 +0100
        Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation helpers Andy Lutomirski <luto@amacapital.net> - 2016-03-09 22:00 +0100
          Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation helpers Linus Torvalds <torvalds@linux-foundation.org> - 2016-03-09 22:30 +0100
          Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation  helpers Ingo Molnar <mingo@kernel.org> - 2016-03-10 12:00 +0100
        Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation  helpers Rich Felker <dalias@libc.org> - 2016-03-10 04:40 +0100
          Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation  helpers Ingo Molnar <mingo@kernel.org> - 2016-03-10 12:20 +0100
            Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation  helpers Rich Felker <dalias@libc.org> - 2016-03-10 17:50 +0100
              Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation  helpers Ingo Molnar <mingo@kernel.org> - 2016-03-10 19:10 +0100
                Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation  helpers Rich Felker <dalias@libc.org> - 2016-03-11 00:30 +0100
                Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation  helpers Szabolcs Nagy <nsz@port70.net> - 2016-03-11 01:20 +0100
                Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation  helpers Rich Felker <dalias@libc.org> - 2016-03-11 01:50 +0100
                Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation helpers Andy Lutomirski <luto@amacapital.net> - 2016-03-11 02:20 +0100
                Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation  helpers Szabolcs Nagy <nsz@port70.net> - 2016-03-11 02:40 +0100
                Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation  helpers Rich Felker <dalias@libc.org> - 2016-03-11 03:00 +0100
                Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation  helpers Szabolcs Nagy <nsz@port70.net> - 2016-03-11 03:00 +0100
                Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation  helpers Ingo Molnar <mingo@kernel.org> - 2016-03-11 10:40 +0100
                Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation  helpers Szabolcs Nagy <nsz@port70.net> - 2016-03-11 12:40 +0100
                Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation helpers Linus Torvalds <torvalds@linux-foundation.org> - 2016-03-11 20:30 +0100
                Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation helpers Andy Lutomirski <luto@amacapital.net> - 2016-03-11 20:40 +0100
                Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation helpers Linus Torvalds <torvalds@linux-foundation.org> - 2016-03-11 20:40 +0100
                Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation helpers Linus Torvalds <torvalds@linux-foundation.org> - 2016-03-11 20:50 +0100
                Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation  helpers Ingo Molnar <mingo@kernel.org> - 2016-03-12 18:10 +0100
                Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation  helpers Rich Felker <dalias@libc.org> - 2016-03-12 19:20 +0100
                Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation  helpers Ingo Molnar <mingo@kernel.org> - 2016-03-12 18:10 +0100
                Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation  helpers Rich Felker <dalias@libc.org> - 2016-03-12 19:10 +0100
                Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation  helpers Ingo Molnar <mingo@kernel.org> - 2016-03-12 19:50 +0100
                Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation  helpers Rich Felker <dalias@libc.org> - 2016-03-12 20:10 +0100
                Re: [musl] Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation  helpers Ingo Molnar <mingo@kernel.org> - 2016-03-12 18:10 +0100
  Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation helpers Andy Lutomirski <luto@amacapital.net> - 2016-03-09 19:00 +0100
    Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation helpers Andy Lutomirski <luto@amacapital.net> - 2016-03-09 22:30 +0100
      Re: [RFC PATCH] x86/vdso/32: Add AT_SYSINFO cancellation helpers Andy Lutomirski <luto@amacapital.net> - 2016-03-12 19:20 +0100

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