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From: Paul Bolle <pebolle@tiscali.nl>
To: "Skidanov, Alexey" <Alexey.Skidanov@amd.com>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"Gabbay, Oded" <Oded.Gabbay@amd.com>
Subject: Re: CONFIG_PREEMPT_COUNT
Date: Mon, 31 Mar 2014 14:24:57 +0200	[thread overview]
Message-ID: <1396268697.2110.15.camel@x220> (raw)
In-Reply-To: <AD975D71AAD7784D8D1265DF6444C2FD0132AD51@storexdag03.amd.com>

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


  reply	other threads:[~2014-03-31 12:25 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-03-31 10:38 CONFIG_PREEMPT_COUNT Skidanov, Alexey
2014-03-31 12:24 ` Paul Bolle [this message]
2014-03-31 12:50   ` CONFIG_PREEMPT_COUNT Skidanov, Alexey

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