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Date: Sat, 22 Dec 2007 13:47:10 +0100 From: Andi Kleen <andi@...stfloor.org> To: David Miller <davem@...emloft.net> Cc: andi@...stfloor.org, mtk.manpages@...glemail.com, akpm@...ux-foundation.org, lkml@...idb.org, paulus@...ba.org, drepper@...hat.com, cfriesen@...tel.com, schwab@...e.de, linux-kernel@...r.kernel.org Subject: Re: compat_sys_times() bogus until jiffies >= 0. On Fri, Dec 21, 2007 at 08:36:40PM -0800, David Miller wrote: > From: Andi Kleen <andi@...stfloor.org> > Date: Sat, 22 Dec 2007 02:53:11 +0100 > > > > And to handle potentially ambiguous cases we, for a long time, have > > > the force_successful_syscall_return() arch hook. > > > > Ah I see what you mean now. > > > > Thanks for the clarification. > > Thanks for continuing to insist it's "impossible" :-) It's still hard -- e.g. i'm not sure your condition flag setting would be even possible for i386 SYSEXIT which does not restore EFLAGS from memory and has some other constraints too. And there is no free other register to use for this either on i386 nor x86-64. Ok you could always disable SYSEXIT on force_successfull_return(), but then e.g. all lseek()s would use the slow path which might not be a good idea. -Andi -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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