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Date: Sun, 15 Apr 2012 01:59:33 +0200 From: Oleg Nesterov <oleg@...hat.com> To: "H. Peter Anvin" <hpa@...or.com>, Linus Torvalds <torvalds@...ux-foundation.org> Cc: Chuck Ebbert <chuckebbert.lk@...il.com>, Jan Kratochvil <jan.kratochvil@...hat.com>, linux-kernel@...r.kernel.org Subject: Re: ptrace && fpu_lazy_restore forgot to mention just in case... On 04/15, Oleg Nesterov wrote: > > --- x/arch/x86/kernel/i387.c~ 2012-04-09 20:12:12.000000000 +0200 > +++ x/arch/x86/kernel/i387.c 2012-04-15 01:34:09.000000000 +0200 > @@ -301,6 +301,8 @@ int xfpregs_set(struct task_struct *targ > > sanitize_i387_state(target); > > + target->thread.fpu.last_cpu = ~0; > + > ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, > &target->thread.fpu.state->fxsave, 0, -1); > > @@ -563,6 +565,8 @@ int fpregs_set(struct task_struct *targe > > sanitize_i387_state(target); > > + target->thread.fpu.last_cpu = ~0; > + > if (!HAVE_HWFP) > return fpregs_soft_set(target, regset, pos, count, kbuf, ubuf); > with this hack the test-case works fine. Oleg. -- 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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