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From: Borislav Petkov <bp@alien8.de>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: "Richard W.M. Jones" <rjones@redhat.com>,
	Chuck Ebbert <cebbert.lkml@gmail.com>,
	linux-kernel@vger.kernel.org, x86@kernel.org,
	Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [BUG 4.2-rc8] Interrupt occurs while apply_alternatives() is patching the handler
Date: Fri, 4 Sep 2015 14:02:38 +0200	[thread overview]
Message-ID: <20150904120238.GB23550@nazgul.tnic> (raw)
In-Reply-To: <alpine.DEB.2.11.1509031232340.15006@nanos>

On Thu, Sep 03, 2015 at 12:41:47PM +0200, Thomas Gleixner wrote:
> Nah. I rather put the local_irq_save into optimize_nops(). All other
> callers of add_nops() are operating on a buffer and use text_poke
> after that. Aside of that optimize_nops() is missing a sync_core().

Whoops.

> Updated patch below.

Looks good, thanks.

Hrrm, maybe optimize_nops() should work on a buffer and do
text_poke_early() too at the end, so that it doesn't differ from all the
other paths changing kernel text. So as to stuff like that doesn't get
missed next time I'm touching it.

But with your way we don't need the additional buffer. I guess your
solution is better resource-wise.

Thanks.

-- 
Regards/Gruss,
    Boris.

ECO tip #101: Trim your mails when you reply.
--

  parent reply	other threads:[~2015-09-04 12:02 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-08-31  2:37 [BUG 4.2-rc8] Interrupt occurs while apply_alternatives() is patching the handler Chuck Ebbert
2015-09-01  6:20 ` Richard W.M. Jones
2015-09-02  9:11   ` Thomas Gleixner
2015-09-02 19:05     ` Richard W.M. Jones
2015-09-03  7:53       ` Richard W.M. Jones
2015-09-03  8:50     ` Borislav Petkov
2015-09-03 10:41       ` Thomas Gleixner
2015-09-03 12:43         ` Josh Boyer
2015-09-03 13:01           ` Thomas Gleixner
2015-09-03 15:48         ` Richard W.M. Jones
2015-09-03 19:30         ` [tip:x86/urgent] x86/alternatives: Make optimize_nops() interrupt safe and synced tip-bot for Thomas Gleixner
2015-09-04  7:40         ` [BUG 4.2-rc8] Interrupt occurs while apply_alternatives() is patching the handler Richard W.M. Jones
2015-09-04 12:02         ` Borislav Petkov [this message]
2015-09-04 13:37           ` Thomas Gleixner
2015-09-05 15:25             ` Borislav Petkov

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