From: Andrew Morton <akpm@linux-foundation.org>
Date: Wed, 7 Nov 2007 21:20:05 -0800

quoted text
> Yup.  But userspace will already have a fit if either the start or end time
> advanced into the glibc-thought-that-was-an-error range.

On x86 only.  We could use force_successful_syscall_return()
to make sure the condition codes get set correctly on
other platforms.

But even in that case we'd still be broken when the return
value is exactly -1 and that's what the application is going
to compare against to test for errors.
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