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

From: Paul Mackerras
Date: Thu Dec 04 2008 - 05:50:36 EST

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.

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