From: "H.J. Lu via Libc-alpha" <libc-alpha@sourceware.org>
To: "Carlos O'Donell" <carlos@redhat.com>
Cc: Florian Weimer <fweimer@redhat.com>,
Carlos O'Donell via Libc-alpha <libc-alpha@sourceware.org>,
Dave Martin <Dave.Martin@arm.com>,
Joseph Myers <joseph@codesourcery.com>
Subject: Re: V8 [PATCH] sysconf: Add _SC_MINSIGSTKSZ/_SC_SIGSTKSZ [BZ #20305]
Date: Wed, 20 Jan 2021 07:33:40 -0800 [thread overview]
Message-ID: <CAMe9rOqf4ExuT_X7X7fjuDKJ-f_1K3FRDyGDQmvAo2LLxj9E_Q@mail.gmail.com> (raw)
In-Reply-To: <f9d6ffa3-e835-e145-a18b-94d6c26e28a5@redhat.com>
On Wed, Jan 20, 2021 at 7:30 AM Carlos O'Donell <carlos@redhat.com> wrote:
>
> On 1/20/21 10:06 AM, Florian Weimer wrote:
> > * Carlos O'Donell via Libc-alpha:
> >
> >> (2) Kernel definition of constant for AT_MINSIGSTKSZ?
> >>
> >> We don't have a released kernel for x86 with this constant defined?
> >
> > I think it's in the generic headers. Don't you see it there?
>
> I do not see it there.
>
> I'm at commit 45dfb8a5659ad286c28fa59008271dbc4e5e3f2d on:
> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
> (which I use for building glibc).
>
> The constant value for AT_MINSIGSTKSZ is not generic.
>
> It is defined by each architecture in per-architecture UAPI headers.
>
> As of today it's only valid for aarch64 (arm64) i.e.
> arch/arm64/include/uapi/asm/auxvec.h:#define AT_MINSIGSTKSZ 51 /* stack needed for signal delivery */
>
> The fact that Intel will define it as 51 also is not guaranteed
> until a released kernel contains a final value.
>
> It has not been proposed for: include/uapi/linux/auxvec.h, and
> so has no generic value that can be used by glibc.
>
> My opinion is that the following needs to happen before we can
> adopt this in glibc:
>
> * Get AT_MINSIGSTKSZ into the generic auxvec.h in linux.
> * Release a kernel with this value.
> * Update glibc to follow with support in the next release.
It has been in glibc since 2018:
commit 174195409d6a3d639dd28e08cf99d6f2559eca9c
Author: Joseph Myers <joseph@codesourcery.com>
Date: Mon Aug 20 15:46:26 2018 +0000
Add NT_VMCOREDD, AT_MINSIGSTKSZ from Linux 4.18 to elf.h.
This patch adds two new constants from Linux 4.18 to elf.h,
NT_VMCOREDD and AT_MINSIGSTKSZ.
Tested for x86_64.
* elf/elf.c (NT_VMCOREDD): New macro.
(AT_MINSIGSTKSZ): Likewise.
> There is a reason we wait for the kernel to adopt these values
> because that's the agreed upon protocol and expectations from
> developers on both sides.
>
> What is our next step?
>
> --
> Cheers,
> Carlos.
>
--
H.J.
next prev parent reply other threads:[~2021-01-20 15:34 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-10 12:19 [PATCH] sysconf: Add _SC_MINSIGSTKSZ/_SC_SIGSTKSZ [BZ #20305] H.J. Lu via Libc-alpha
2020-10-12 7:53 ` Szabolcs Nagy via Libc-alpha
2020-10-12 11:04 ` Dave Martin via Libc-alpha
2020-10-12 12:42 ` V4 " H.J. Lu via Libc-alpha
2020-10-12 13:21 ` Dave Martin via Libc-alpha
2020-10-12 14:12 ` Szabolcs Nagy via Libc-alpha
2020-10-12 14:37 ` Dave Martin via Libc-alpha
2020-10-12 15:36 ` [libc-coord] " Rich Felker
2020-10-12 22:03 ` Joseph Myers
2020-10-13 20:32 ` V5 " H.J. Lu via Libc-alpha
2020-10-14 17:47 ` Dave Martin via Libc-alpha
2020-10-14 18:07 ` Florian Weimer via Libc-alpha
2020-10-19 16:30 ` Dave Martin via Libc-alpha
2020-10-15 11:57 ` V6 " H.J. Lu via Libc-alpha
2020-10-19 15:08 ` Dave Martin via Libc-alpha
2020-10-19 21:32 ` H.J. Lu via Libc-alpha
2020-10-20 9:19 ` Dave Martin via Libc-alpha
2020-10-20 14:59 ` H.J. Lu via Libc-alpha
2020-10-20 15:22 ` Dave Martin via Libc-alpha
2020-10-20 18:19 ` V7 " H.J. Lu via Libc-alpha
2020-11-03 3:06 ` PING: " H.J. Lu via Libc-alpha
2020-11-04 16:50 ` Dave Martin via Libc-alpha
2020-11-04 17:48 ` H.J. Lu via Libc-alpha
2020-11-18 14:13 ` H.J. Lu via Libc-alpha
2020-11-18 14:25 ` Zack Weinberg
2020-11-18 14:40 ` H.J. Lu via Libc-alpha
2020-11-18 15:12 ` Zack Weinberg
2020-11-18 15:17 ` H.J. Lu via Libc-alpha
2020-11-18 15:20 ` Florian Weimer
2020-11-18 17:04 ` Dave Martin via Libc-alpha
2020-11-18 17:35 ` Florian Weimer
2020-11-18 17:48 ` H.J. Lu via Libc-alpha
2020-11-18 18:09 ` Dave Martin via Libc-alpha
2020-11-19 14:59 ` Szabolcs Nagy via Libc-alpha
2020-11-19 15:10 ` H.J. Lu via Libc-alpha
2020-11-19 15:39 ` Zack Weinberg
2020-11-19 15:51 ` Florian Weimer
2020-11-19 16:16 ` Rich Felker
2020-11-19 16:52 ` Dave Martin via Libc-alpha
2020-11-19 16:37 ` Dave Martin via Libc-alpha
2020-11-19 17:29 ` Rich Felker
2020-11-19 17:33 ` Szabolcs Nagy via Libc-alpha
2020-11-19 19:39 ` Dave Martin via Libc-alpha
2020-11-20 14:08 ` H.J. Lu via Libc-alpha
2020-11-20 14:11 ` Florian Weimer
2020-11-20 23:13 ` V8 " H.J. Lu via Libc-alpha
2021-01-20 14:16 ` Carlos O'Donell via Libc-alpha
2021-01-20 15:05 ` V9 " H.J. Lu via Libc-alpha
2021-01-22 19:41 ` V10 " H.J. Lu via Libc-alpha
2021-01-25 13:31 ` Carlos O'Donell via Libc-alpha
2021-01-25 13:57 ` H.J. Lu via Libc-alpha
2021-01-25 13:59 ` Carlos O'Donell via Libc-alpha
2021-01-25 13:58 ` Carlos O'Donell via Libc-alpha
2021-01-25 14:16 ` Florian Weimer via Libc-alpha
2021-02-02 13:08 ` Carlos O'Donell via Libc-alpha
2021-01-25 14:34 ` Carlos O'Donell via Libc-alpha
2021-01-20 15:06 ` V8 " Florian Weimer via Libc-alpha
2021-01-20 15:30 ` Carlos O'Donell via Libc-alpha
2021-01-20 15:33 ` H.J. Lu via Libc-alpha [this message]
2021-01-20 15:59 ` Carlos O'Donell via Libc-alpha
2021-01-20 16:04 ` H.J. Lu via Libc-alpha
2021-01-20 15:33 ` Florian Weimer via Libc-alpha
2020-10-15 12:26 ` [PATCH] Deprecate SIGSTKSZ/MINSIGSTKSZ with _SC_SIGSTKSZ_SOURCE H.J. Lu via Libc-alpha
2020-10-15 19:59 ` Joseph Myers
2020-10-15 21:22 ` V2 " H.J. Lu via Libc-alpha
2020-10-16 0:57 ` Joseph Myers
2021-07-09 18:53 ` Carlos O'Donell via Libc-alpha
2021-07-09 19:34 ` H.J. Lu via Libc-alpha
2020-10-12 22:07 ` [PATCH] sysconf: Add _SC_MINSIGSTKSZ/_SC_SIGSTKSZ [BZ #20305] Joseph Myers
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