linux-kernel - Re: [PATCH 7/7] preempt: Take away preempt_enable_no

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Message-ID: <20131120190011.GX16796@laptop.programming.kicks-ass.net>
Date:	Wed, 20 Nov 2013 20:00:11 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc:	Arjan van de Ven <arjan@...ux.intel.com>, lenb@...nel.org,
	rjw@...ysocki.net, Eliezer Tamir <eliezer.tamir@...ux.intel.com>,
	Chris Leech <christopher.leech@...el.com>,
	David Miller <davem@...emloft.net>, rui.zhang@...el.com,
	Mike Galbraith <bitbucket@...ine.de>,
	Ingo Molnar <mingo@...nel.org>, hpa@...or.com,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [PATCH 7/7] preempt: Take away preempt_enable_no_resched() from
 modules

On Wed, Nov 20, 2013 at 10:54:57AM -0800, Jacob Pan wrote:
> run into a couple of compile issues.
> 
> 1)
> include/linux/rcupdate.h: In function ‘rcu_read_unlock_sched_notrace’:
> include/linux/rcupdate.h:889:2: error: implicit declaration of function
> ‘preempt_enable_no_resched_notrace’ [-Werror=implicit-function-declaration]
> 
> 2)
> In file included from drivers/cpufreq/acpi-cpufreq.c:41:0:
> include/linux/uaccess.h: In function ‘pagefault_enable’:
> include/linux/uaccess.h:34:2: error: implicit declaration of function
> ‘preempt_check_resched’ [-Werror=implicit-function-declaration]
> 
> 1) happens when CONFIG_PREEMPT is not set, perhaps add a dummy function?

Ah, indeed, will fix.

> 2) I am not sure if we should take pagefault_enable away from modules

We can't I think, I'll have to fix that up. Easiest would be to make
preempt_check_resched() available again. That function actually adds
preemption points so its not bad.
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