diff options
| author | Paul Mackerras <paulus@samba.org> | 2005-11-10 04:28:03 +0100 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2005-11-10 04:28:03 +0100 |
| commit | cbe62e2b4a764aa3f9a2b9c9004f8e86a1f0ade8 (patch) | |
| tree | 7d29a29e11c30ab63953c96ae5e5fd4e91daac67 /arch/powerpc/kernel | |
| parent | powerpc: Fixes for 32-bit powermac SMP (diff) | |
| download | linux-cbe62e2b4a764aa3f9a2b9c9004f8e86a1f0ade8.tar.xz linux-cbe62e2b4a764aa3f9a2b9c9004f8e86a1f0ade8.zip | |
powerpc: Fix SMP time initialization problem
We were getting the last_jiffy per-cpu variable set ahead of the current
timebase in smp_space_timers on SMP machines. This caused the loop in
timer_interrupt to loop virtually forever, since tb_ticks_since assumes
that it will never be called with the timebase behind the last_jiffy
value.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/kernel')
| -rw-r--r-- | arch/powerpc/kernel/time.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c index 386006b3d616..260b6ecd26a9 100644 --- a/arch/powerpc/kernel/time.c +++ b/arch/powerpc/kernel/time.c @@ -484,6 +484,8 @@ void __init smp_space_timers(unsigned int max_cpus) unsigned long offset = tb_ticks_per_jiffy / max_cpus; unsigned long previous_tb = per_cpu(last_jiffy, boot_cpuid); + /* make sure tb > per_cpu(last_jiffy, cpu) for all cpus always */ + previous_tb -= tb_ticks_per_jiffy; for_each_cpu(i) { if (i != boot_cpuid) { previous_tb += offset; |