linux-kernel - Re: CONFIG_PREEMPT

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Message-ID: <1396268697.2110.15.camel@x220>
Date:	Mon, 31 Mar 2014 14:24:57 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	"Skidanov, Alexey" <Alexey.Skidanov@....com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Gabbay, Oded" <Oded.Gabbay@....com>
Subject: Re: CONFIG_PREEMPT_COUNT

Alexey,

On Mon, 2014-03-31 at 10:38 +0000, Skidanov, Alexey wrote:
> What is the purpose of CONFIG_PREEMPT_COUNT define and how I can
> define it?

CONFIG_PREEMPT_COUNT is a Kconfig macro, ie it's (in short) to be
defined as a result one of the "*config" make targets. And doing
    git grep -nw PREEMPT_COUNT

gives
    kernel/Kconfig.preempt:38:      select PREEMPT_COUNT
    kernel/Kconfig.preempt:57:config PREEMPT_COUNT
    lib/Kconfig.debug:964:  select PREEMPT_COUNT

And looking at those hits it seems PREEMPT_COUNT will be set, and
therefore CONFIG_PREEMPT_COUNT defined, if either PREEMPT or
DEBUG_ATOMIC_SLEEP are set in a .config.

(I'm not familiar with PREEMPT_COUNT. I think I never used it.)

Hope this helps,


Paul Bolle

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