From: Paul Mackerras Date: Thu, 10 Nov 2005 03:28:03 +0000 (+1100) Subject: powerpc: Fix SMP time initialization problem X-Git-Tag: v2.6.15-rc1~51^2~12 X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cbe62e2b4a764aa3f9a2b9c9004f8e86a1f0ade8;p=linux-2.6 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 --- diff --git a/arch/powerpc/kernel/time.c b/arch/powerpc/kernel/time.c index 386006b3d6..260b6ecd26 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;