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authorStephen Warren <swarren@nvidia.com>2012-11-07 17:58:54 -0700
committerStephen Warren <swarren@nvidia.com>2012-12-24 09:36:07 -0700
commit7b1f62076bba10786d2118006ae68ac120cd6c56 (patch)
tree9af9f556fc331c77644c2e1c4eafdddad60019b1 /arch/arm/kernel/time.c
parent547046f2f09f1837d39619afbc7a6e35673d7c98 (diff)
downloadlinux-7b1f62076bba10786d2118006ae68ac120cd6c56.tar.bz2
time: convert arch_gettimeoffset to a pointer
Currently, whenever CONFIG_ARCH_USES_GETTIMEOFFSET is enabled, each arch core provides a single implementation of arch_gettimeoffset(). In many cases, different sub-architectures, different machines, or different timer providers exist, and so the arch ends up implementing arch_gettimeoffset() as a call-through-pointer anyway. Examples are ARM, Cris, M68K, and it's arguable that the remaining architectures, M32R and Blackfin, should be doing this anyway. Modify arch_gettimeoffset so that it itself is a function pointer, which the arch initializes. This will allow later changes to move the initialization of this function into individual machine support or timer drivers. This is particularly useful for code in drivers/clocksource which should rely on an arch-independant mechanism to register their implementation of arch_gettimeoffset(). This patch also converts the Cris architecture to set arch_gettimeoffset directly to the final implementation in time_init(), because Cris already had separate time_init() functions per sub-architecture. M68K and ARM are converted to set arch_gettimeoffset to the final implementation in later patches, because they already have function pointers in place for this purpose. Cc: Russell King <linux@arm.linux.org.uk> Cc: Mike Frysinger <vapier@gentoo.org> Cc: Mikael Starvik <starvik@axis.com> Cc: Hirokazu Takata <takata@linux-m32r.org> Cc: Thomas Gleixner <tglx@linutronix.de> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Jesper Nilsson <jesper.nilsson@axis.com> Acked-by: John Stultz <johnstul@us.ibm.com> Signed-off-by: Stephen Warren <swarren@nvidia.com>
Diffstat (limited to 'arch/arm/kernel/time.c')
-rw-r--r--arch/arm/kernel/time.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c
index 09be0c3c9069..b0190b41cb33 100644
--- a/arch/arm/kernel/time.c
+++ b/arch/arm/kernel/time.c
@@ -70,7 +70,7 @@ EXPORT_SYMBOL(profile_pc);
#endif
#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
-u32 arch_gettimeoffset(void)
+static u32 arm_gettimeoffset(void)
{
if (system_timer->offset != NULL)
return system_timer->offset() * 1000;
@@ -164,6 +164,10 @@ device_initcall(timer_init_syscore_ops);
void __init time_init(void)
{
+#ifdef CONFIG_ARCH_USES_GETTIMEOFFSET
+ arch_gettimeoffset = arm_gettimeoffset;
+#endif
+
system_timer = machine_desc->timer;
system_timer->init();
sched_clock_postinit();