In order to enforce backward compatibility with older
config files, we want the new dynticks-idle Kconfig entry
to default its value to the one of the old CONFIG_NO_HZ symbol
if present.
Namely we want:
config NO_HZ # old obsolete dynticks idle symbol
bool
config NO_HZ_IDLE # new dynticks idle symbol
default NO_HZ
However Kconfig prevents this to work if the old symbol
is not visible. And this is currently the case because
NO_HZ lacks a title in order to show it in make oldconfig
and alike.
To fix this, bring a minimal title and help text to the
obsolete Kconfig entry that explains its purpose. This
makes the "defaulting" to work.
Reported-by: Ingo Molnar <mi...@kernel.org>
Signed-off-by: Frederic Weisbecker <fweis...@gmail.com>
Cc: Chris Metcalf <cmetc...@tilera.com>
Cc: Christoph Lameter <c...@linux.com>
Cc: Geoff Levand <ge...@infradead.org>
Cc: Gilad Ben Yossef <gi...@benyossef.com>
Cc: Hakan Akkan <hakanak...@gmail.com>
Cc: Ingo Molnar <mi...@kernel.org>
Cc: Kevin Hilman <khil...@linaro.org>
Cc: Li Zhong <zh...@linux.vnet.ibm.com>
Cc: Paul E. McKenney <paul...@linux.vnet.ibm.com>
Cc: Paul Gortmaker <paul.gortma...@windriver.com>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Steven Rostedt <rost...@goodmis.org>
Cc: Thomas Gleixner <t...@linutronix.de>
---
kernel/time/Kconfig | 12 ++++++++----
1 files changed, 8 insertions(+), 4 deletions(-)
diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig
index 27cc404..cbe64be 100644
--- a/kernel/time/Kconfig
+++ b/kernel/time/Kconfig
@@ -75,10 +75,6 @@ config NO_HZ_COMMON
depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS
select TICK_ONESHOT
-# Kept around for compatibility, maps to NO_HZ_IDLE
-config NO_HZ
- bool
-
choice
prompt "Timer tick handling"
default NO_HZ_IDLE if NO_HZ
@@ -130,6 +126,14 @@ config NO_HZ_EXTENDED
endchoice
+config NO_HZ
+ bool "Old Idle dynticks config"
+ depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS
+ help
+ This is the old config entry that enables dynticks idle.
+ We keep it around for a little while to enforce backward
+ compatibility with older config files.
+
config HIGH_RES_TIMERS
bool "High Resolution Timer Support"
depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS
--
1.7.5.4
--
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