linux-kernel - Not able to use HIGH_RES

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Date:	Mon, 19 Mar 2012 18:31:44 +0530
From:	Ajeet Yadav <ajeet.yadav.77@...il.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>,
	John Stultz <john.stultz@...aro.org>,
	linux-kernel@...r.kernel.org, Steven Rostedt <rostedt@...dmis.org>
Subject: Not able to use HIGH_RES_TIMERS on ARM

Hi John, refering to you patch:

ARM: remove 'select GENERIC_TIME'
GENERIC_TIME is now enabled by default, so 'select GENERIC_TIME' is
redundant.  Remove them.

The following config's are not selectable:
config NO_HZ, config HIGH_RES_TIMERS, config IRQSOFF_TRACER, config
PREEMPT_TRACER

As far as I know, ARM now uses GENERIC_TIME via the arch_getoffset()
infrastructure, i.e ARCH_USES_GETTIMEOFFSET=y

diff -Naurp -X linux-3.0.20/Documentation/dontdiff
linux-3.0.20/kernel/time/Kconfig
linux-3.0.20-dirty/kernel/time/Kconfig
--- linux-3.0.20/kernel/time/Kconfig    2012-02-06 23:01:45.000000000 +0530
+++ linux-3.0.20-dirty/kernel/time/Kconfig      2012-03-19
18:22:32.000000000 +0530
@@ -6,7 +6,7 @@ config TICK_ONESHOT

 config NO_HZ
        bool "Tickless System (Dynamic Ticks)"
-       depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS
+       depends on GENERIC_CLOCKEVENTS
        select TICK_ONESHOT
        help
          This option enables a tickless system: timer interrupts will
@@ -15,7 +15,7 @@ config NO_HZ

 config HIGH_RES_TIMERS
        bool "High Resolution Timer Support"
-       depends on !ARCH_USES_GETTIMEOFFSET && GENERIC_CLOCKEVENTS
+       depends on GENERIC_CLOCKEVENTS
        select TICK_ONESHOT
        help
          This option enables high resolution timer support. If your
diff -Naurp -X linux-3.0.20/Documentation/dontdiff
linux-3.0.20/kernel/trace/Kconfig
linux-3.0.20-dirty/kernel/trace/Kconfig
--- linux-3.0.20/kernel/trace/Kconfig   2012-02-06 23:01:45.000000000 +0530
+++ linux-3.0.20-dirty/kernel/trace/Kconfig     2012-03-19
18:21:41.000000000 +0530
@@ -173,7 +173,6 @@ config IRQSOFF_TRACER
        bool "Interrupts-off Latency Tracer"
        default n
        depends on TRACE_IRQFLAGS_SUPPORT
-       depends on !ARCH_USES_GETTIMEOFFSET
        select TRACE_IRQFLAGS
        select GENERIC_TRACER
        select TRACER_MAX_TRACE
@@ -195,7 +194,6 @@ config IRQSOFF_TRACER
 config PREEMPT_TRACER
        bool "Preemption-off Latency Tracer"
        default n
-       depends on !ARCH_USES_GETTIMEOFFSET
        depends on PREEMPT
        select GENERIC_TRACER
        select TRACER_MAX_TRACE
--
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