linux-kernel - [tip:timers/core] nohz: ensure users are aware boot CPU is not NO_HZ

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Message-ID: <tip-f96a34e27df19335155394a235ea3a096bc52a71@git.kernel.org>
Date:	Wed, 26 Feb 2014 12:07:34 -0800
From:	tip-bot for Paul Gortmaker <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...nel.org,
	peterz@...radead.org, paulmck@...ux.vnet.ibm.com,
	fweisbec@...il.com, rostedt@...dmis.org, tglx@...utronix.de,
	paul.gortmaker@...driver.com
Subject: [tip:timers/core] nohz:
  ensure users are aware boot CPU is not NO_HZ_FULL

Commit-ID:  f96a34e27df19335155394a235ea3a096bc52a71
Gitweb:     http://git.kernel.org/tip/f96a34e27df19335155394a235ea3a096bc52a71
Author:     Paul Gortmaker <paul.gortmaker@...driver.com>
AuthorDate: Thu, 6 Feb 2014 13:36:21 -0500
Committer:  Frederic Weisbecker <fweisbec@...il.com>
CommitDate: Fri, 14 Feb 2014 17:59:17 +0100

nohz: ensure users are aware boot CPU is not NO_HZ_FULL

This bit of information is in the Kconfig help text:

  "Note the boot CPU will still be kept outside the range to
  handle the timekeeping duty."

However neither the variable NO_HZ_FULL_ALL, or the prompt
convey this important detail, so lets add it to the prompt
to make it more explicitly obvious to the average user.

Acked-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Paul Gortmaker <paul.gortmaker@...driver.com>
Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/1391711781-7466-1-git-send-email-paul.gortmaker@windriver.com
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
---
 kernel/time/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig
index 3ce6e8c..f448513 100644
--- a/kernel/time/Kconfig
+++ b/kernel/time/Kconfig
@@ -124,7 +124,7 @@ config NO_HZ_FULL
 endchoice
 
 config NO_HZ_FULL_ALL
-       bool "Full dynticks system on all CPUs by default"
+       bool "Full dynticks system on all CPUs by default (except CPU 0)"
        depends on NO_HZ_FULL
        help
          If the user doesn't pass the nohz_full boot option to
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