Re: [PATCH] Allow times and time system calls to return smallnegative values

[Paul Mackerras]

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.
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