linux-kernel - Re: [PATCH] Allow times and time system calls to return small negative values

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Message-Id: <20081203.212313.74138057.davem@davemloft.net>
Date:	Wed, 03 Dec 2008 21:23:13 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	paulus@...ba.org
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Joakim.Tjernlund@...nsmode.se
Subject: Re: [PATCH] Allow times and time system calls to return small
 negative values

From: Paul Mackerras <paulus@...ba.org>
Date: Thu, 4 Dec 2008 16:06:56 +1100

> At the moment, the times() system call will appear to fail for a
> period shortly after boot, while the value it want to return is
> between -4095 and -1.  The same thing will also happen for the time()
> system call on 32-bit platforms some time in 2106 or so.
> 
> On some platforms, such as x86, this is unavoidable because of the
> system call ABI, but other platforms such as powerpc have a separate
> error indication from the return value, so system calls can in fact
> return small negative values without indicating an error.  On those
> platforms, force_successful_syscall_return() provides a way to
> indicate that the system call return value should not be treated as an
> error even if it is in the range which would normally be taken as a
> negative error number.
> 
> This adds a force_successful_syscall_return() call to the time() and
> times() system calls plus their 32-bit compat versions, so that they
> don't erroneously indicate an error on those platforms whose system
> call ABI has a separate error indication.  This will not affect
> anything on other platforms.
> 
> Joakim Tjernlund added the fix for time() and the compat versions of
> time() and times(), after I did the fix for times().
> 
> Signed-off-by: Joakim Tjernlund <Joakim.Tjernlund@...nsmode.se>
> Signed-off-by: Paul Mackerras <paulus@...ba.org>

Acked-by: David S. Miller <davem@...emloft.net>
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