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| author | Frederic Weisbecker <fweisbec@gmail.com> | 2013-04-12 16:40:12 +0200 |
|---|---|---|
| committer | Frederic Weisbecker <fweisbec@gmail.com> | 2013-04-15 19:39:40 +0200 |
| commit | 0644ca5c774f1a7033bfc83c7ed0660f74f28b56 (patch) | |
| tree | ddb1cad5a3d218682f8a03268d9a67949fbeb0f4 /kernel | |
| parent | 1034fc2f41aaf32f782a9362178f9a236ac5a50a (diff) | |
nohz: Fix old dynticks idle Kconfig backward compatibility
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 <mingo@kernel.org>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Geoff Levand <geoff@infradead.org>
Cc: Gilad Ben Yossef <gilad@benyossef.com>
Cc: Hakan Akkan <hakanakkan@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Kevin Hilman <khilman@linaro.org>
Cc: Li Zhong <zhong@linux.vnet.ibm.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/time/Kconfig | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/kernel/time/Kconfig b/kernel/time/Kconfig index 27cc404ea18..cbe64be17d1 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 |