From: Daniel Jacobowitz <dan@debian.org>
To: Johannes Stezenbach <js@convergence.de>,
"Kevin D. Kissell" <kevink@mips.com>,
linux-mips@linux-mips.org
Subject: Re: Once again: test_and_set for CPUs w/o LL/SC
Date: Mon, 7 Oct 2002 14:51:36 -0400 [thread overview]
Message-ID: <20021007185136.GA16501@nevyn.them.org> (raw)
In-Reply-To: <20021007184344.GA17548@convergence.de>
On Mon, Oct 07, 2002 at 08:43:44PM +0200, Johannes Stezenbach wrote:
> The question is how the glibc can detect if
> a) the CPU does not have LL/SC
> b) the kernel guarantees k1 != MAGIC
>
> I think the kernel should announce this explicitly.
> In my patch from Sep 16 I used a sysctl, but that's
> probably bad because glibc would rely on a real new
> include/linux/sysctl.h.
>
> I need some advice on this (maybe add a line to /proc/cpuinfo,
> or create a new /proc entry? or add a sysmips call to get
> this info?).
You should be using an "aux vector"; see how PowerPC provides current
glibc with the size of a cache line.
--
Daniel Jacobowitz
MontaVista Software Debian GNU/Linux Developer
next prev parent reply other threads:[~2002-10-07 18:51 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-16 16:40 Once again: test_and_set for CPUs w/o LL/SC Johannes Stezenbach
2002-10-07 14:47 ` Johannes Stezenbach
2002-10-07 16:21 ` Kevin D. Kissell
2002-10-07 16:21 ` Kevin D. Kissell
2002-10-07 18:43 ` Johannes Stezenbach
2002-10-07 18:51 ` Daniel Jacobowitz [this message]
2002-10-15 17:52 ` Johannes Stezenbach
2002-10-08 7:38 ` Kevin D. Kissell
2002-10-08 7:38 ` Kevin D. Kissell
2002-10-15 15:36 ` Maciej W. Rozycki
2002-10-15 17:21 ` Johannes Stezenbach
2002-10-16 12:20 ` Maciej W. Rozycki
2002-10-16 12:52 ` Johannes Stezenbach
2002-10-16 16:30 ` Johannes Stezenbach
2002-10-17 9:47 ` Gleb O. Raiko
2002-10-17 12:02 ` Maciej W. Rozycki
2002-10-17 13:11 ` Johannes Stezenbach
2002-10-17 13:32 ` Gleb O. Raiko
2002-10-17 14:13 ` Johannes Stezenbach
2002-10-16 18:11 ` Johannes Stezenbach
2002-10-16 18:23 ` Johannes Stezenbach
2002-10-17 11:57 ` Maciej W. Rozycki
2002-10-17 13:25 ` Johannes Stezenbach
2002-10-15 15:17 ` Maciej W. Rozycki
2002-10-15 16:50 ` Johannes Stezenbach
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