linux-kernel - Re: [PATCH] x86: fix wakeup

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Message-ID: <20081117175223.GA5142@localhost>
Date:	Mon, 17 Nov 2008 20:52:23 +0300
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Yinghai Lu <yinghai@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: fix wakeup_cpu with numaq/es7000 v2

[Ingo Molnar - Mon, Nov 17, 2008 at 06:35:27PM +0100]
| 
| * Cyrill Gorcunov <gorcunov@...il.com> wrote:
| 
| > [Ingo Molnar - Mon, Nov 17, 2008 at 05:52:24PM +0100]
| > | 
| > | * Yinghai Lu <yinghai@...nel.org> wrote:
| > | 
| > | > Impact: fix wakeup path with numaq and es7000
| > | 
| > | applied	to tip/x86/quirks, thanks Yinghai!
| > | 
| > | A couple of comments:
| > | 
| > | > +static inline void inquire_remote_apic(int apicid)
| > | > +{
| > | > +	if (apic_verbosity >= APIC_DEBUG)
| > | > +		__inquire_remote_apic(apicid);
| > | > +}
| > |
| > 
| > Btw, Ingo, Yinghai,
| > 
| > it's a bit weird but I found that we use apic_verbosity
| > here to _do_ something (ie touching circuit) but on any
| > other cases apic_verbosity is just a additional logging
| > filter so -- what the initial apic_verbosity purpose was?
| > If it's just a logging filter (to which I'm more biased)
| > this case is plain wrong. But if apic_verbosity is not
| > like this -- then it's fine. Since I was not initial author
| > of the code -- I'm asking you :)
| 
| the reason why it's dependent on apic_verbosity is that the 
| inquire_remote_apic() function is a debug function which we only call 
| if we fail to start up a secondary CPU.
| 
| Perhaps renaming it to debug_print_remote_apic() would have made that 
| more obvious.
| 
| 	Ingo
| 

Ah... I missed io_apic.c apic_verbosity usage, sorry for noise.
It's all fine! Thanks.

		- Cyrill -
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