From: Paul Mackerras <paulus@samba.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: lkml@davidb.org, linux-kernel@vger.kernel.org,
drepper@redhat.com, mtk-manpages@gmx.net
Subject: Re: compat_sys_times() bogus until jiffies >= 0.
Date: Thu, 8 Nov 2007 15:59:12 +1100 [thread overview]
Message-ID: <18226.38816.486372.52353@cargo.ozlabs.ibm.com> (raw)
In-Reply-To: <20071107190714.9c404e28.akpm@linux-foundation.org>
Andrew Morton writes:
> "the latter" is what my protopatch does isn't it? It wraps at 0x7fffffff.
> It appears that glibc treats all of 0x80000000-0xffffffff as an error.
Not on powerpc. On powerpc the error indication is carried separately
in a condition register bit. So a force_successful_syscall_return()
call will make glibc automatically do the right thing without any
glibc changes on powerpc.
Wrapping at 0x7fffffff will cause programs to see large negative
deltas between successive calls when the wrap occurs. I can see that
giving userspace fits. :)
Paul.
next prev parent reply other threads:[~2007-11-08 4:59 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-11-07 22:47 David Brown
2007-11-07 23:28 ` Andrew Morton
2007-11-08 0:18 ` Andrew Morton
2007-11-08 0:54 ` Andreas Schwab
2007-11-08 1:17 ` Andrew Morton
2007-11-08 1:53 ` Paul Mackerras
2007-11-08 2:09 ` David Miller
2007-11-08 10:20 ` Andreas Schwab
2007-11-08 14:42 ` Chris Friesen
2007-11-09 18:20 ` Ulrich Drepper
2007-12-20 11:36 ` Michael Kerrisk
2007-12-20 11:51 ` David Miller
2007-12-22 0:42 ` Andi Kleen
2007-12-22 1:41 ` David Miller
2007-12-22 1:45 ` David Miller
2007-12-22 1:53 ` Andi Kleen
2007-12-22 4:36 ` David Miller
2007-12-22 12:47 ` Andi Kleen
2007-12-22 1:49 ` Andi Kleen
2007-11-08 19:25 ` Denys Vlasenko
2007-11-08 3:07 ` Andrew Morton
2007-11-08 3:13 ` David Miller
2007-11-08 5:15 ` Paul Mackerras
2007-11-08 6:24 ` David Miller
2007-11-08 4:59 ` Paul Mackerras [this message]
2007-11-08 5:20 ` Andrew Morton
2007-11-08 5:36 ` Paul Mackerras
2007-11-08 6:12 ` Andrew Morton
2007-11-08 6:25 ` David Miller
2007-11-08 7:09 ` Andrew Morton
2007-11-08 7:14 ` David Miller
2007-11-08 8:53 ` Paul Mackerras
2007-11-08 6:22 ` David Miller
2007-11-08 19:27 ` Denys Vlasenko
2007-11-08 0:50 ` David Miller
2007-11-08 1:13 ` Andrew Morton
2007-11-08 6:00 ` David Brown
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