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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2007-01-08 19:49:12 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2007-01-08 19:50:03 +0000
commite97126cd9056b3b42cdc862ace2ed66f8026f55b (patch)
tree9be88dbac72032d8e20cdd9b4034972dba6657ad /arch/arm/kernel/time.c
parent6020dff09252e3670a89edb36baaa4afb9b10d15 (diff)
downloadop-kernel-dev-e97126cd9056b3b42cdc862ace2ed66f8026f55b.zip
op-kernel-dev-e97126cd9056b3b42cdc862ace2ed66f8026f55b.tar.gz
[ARM] Provide basic printk_clock() implementation
Current sched_clock() implementations on ARM cause unbootable kernels with PRINTK_TIME support enabled. To avoid this, provide a basic printk_clock() implementation which avoids sched_clock() being called before the page tables have been set up. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel/time.c')
-rw-r--r--arch/arm/kernel/time.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c
index 174cd49..3c8cdcf 100644
--- a/arch/arm/kernel/time.c
+++ b/arch/arm/kernel/time.c
@@ -87,6 +87,17 @@ unsigned long long __attribute__((weak)) sched_clock(void)
return (unsigned long long)jiffies * (1000000000 / HZ);
}
+/*
+ * An implementation of printk_clock() independent from
+ * sched_clock(). This avoids non-bootable kernels when
+ * printk_clock is enabled.
+ */
+unsigned long long printk_clock(void)
+{
+ return (unsigned long long)(jiffies - INITIAL_JIFFIES) *
+ (1000000000 / HZ);
+}
+
static unsigned long next_rtc_update;
/*
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