Re: [tip:x86/asm] sched/x86_64: Don't save flags on context switch
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- Subject: Re: [tip:x86/asm] sched/x86_64: Don't save flags on context switch
- From: Oleg Nesterov <oleg@xxxxxxxxxx>
- Date: Mon, 3 Nov 2014 22:47:12 +0100
- Cc: Jan Beulich <jbeulich@xxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Sebastian Lackner <sebastian@xxxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, Chuck Ebbert <cebbert.lkml@xxxxxxxxx>, Anish Bhatt <anish@xxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, "linux-tip-commits@xxxxxxxxxxxxxxx" <linux-tip-commits@xxxxxxxxxxxxxxx>
- In-reply-to: <CALCETrWM2wVynp1rrip9AWtNYDzjC4M8JqKR82ew5dpyrTWMgA@mail.gmail.com>
- User-agent: Mutt/1.5.18 (2008-05-17)
On 11/03, Andy Lutomirski wrote:
>
> And do we ever have TF set during a context switch? I hope not.
I too hope.
> Also, what's with 'jmp exit_intr' at the end of retint_kernel? Why
> isn't that 'jmp retint_kernel'?
Even better, why not "jmp retint_restore_args" ?
preempt_schedule_irq() checks need_resched() and returns with irqs
disabled, not need to to recheck test_preempt_need_resched() ?
Oleg.
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