linux-kernel - Re: linux-next: build failure after merge of the tip tree

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Message-ID: <20140114141406.GD7572@laptop.programming.kicks-ass.net>
Date:	Tue, 14 Jan 2014 15:14:06 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Mikulas Patocka <mpatocka@...hat.com>
Subject: Re: linux-next: build failure after merge of the tip tree

On Tue, Jan 14, 2014 at 02:26:27PM +1100, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the tip tree, today's linux-next build (x86_64 allmodconfig)
> failed like this:
> 
> drivers/cpufreq/speedstep-lib.c: In function 'speedstep_get_freqs':
> drivers/cpufreq/speedstep-lib.c:467:2: error: implicit declaration of function 'preempt_check_resched' [-Werror=implicit-function-declaration]
>   preempt_check_resched();
>   ^
> 
> Caused by commit 62b94a08da1b ("sched/preempt: Take away
> preempt_enable_no_resched() from modules") interacting with commit
> 24e1937b2386 ("speedstep-smi: enable interrupts when waiting") from the
> pm tree.

I think that pm commit is a very good example of why the sched/preempt
patch is a very good idea.

Also that Changelog fails to explain why enabling interrupts helps. What
interrupt is required for progress, and how does it make the progress
happen.
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