From: Paul Mackerras <paulus@samba.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: akpm@linux-foundation.org, linux-kernel@vger.kernel.org,
Joakim.Tjernlund@transmode.se
Subject: Re: [PATCH] Allow times and time system calls to return small negative values
Date: Thu, 4 Dec 2008 21:49:57 +1100 [thread overview]
Message-ID: <18743.46549.833800.667962@cargo.ozlabs.ibm.com> (raw)
In-Reply-To: <20081204075751.GA32594@elte.hu>
Ingo Molnar writes:
> > + force_successful_syscall_return();
> > return compat_jiffies_to_clock_t(jiffies);
>
> just curious: what code does force_successful_syscall_return() actually
> run in the powerpc case - those bits are missing from this patch. I
> suspect it sets some sort of flag?
It sets the TIF_NOERROR thread flag, which is tested in the syscall
exit path along with various other thread flags.
force_successful_syscall_return() is defined for powerpc in
arch/powerpc/include/asm/ptrace.h. It's nothing new, it has existed
for ages and is used in a few other places already. It has existing
non-null definitions on alpha, ia64, powerpc, and sparc64.
Paul.
next prev parent reply other threads:[~2008-12-04 10:50 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-12-04 5:06 Paul Mackerras
2008-12-04 5:23 ` David Miller
2008-12-04 7:57 ` Ingo Molnar
2008-12-04 10:49 ` Paul Mackerras [this message]
2008-12-04 15:40 ` Ingo Molnar
2008-12-04 16:01 ` [PATCH] Allow times and time system calls to return smallnegative values Joakim Tjernlund
2008-12-04 17:03 ` [PATCH] Allow times and time system calls to return small negative values David Miller
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