From 6a75a6b8e85e92cc774d42a4e113c76c30b5a539 Mon Sep 17 00:00:00 2001 From: Milton Miller Date: Mon, 20 Oct 2008 15:37:03 +0000 Subject: powerpc: Use cpu_thread_in_core in smp_init for of_spin_map We used to assume that even numbered threads were the primary threads, ie those that would be listed and started as a cpu from open firmware. Replace a left over is even (% 2) check with a check for it being a primary thread and update the comments. Tested with a debug print on pseries, identical code found for cell. Signed-off-by: Milton Miller Signed-off-by: Benjamin Herrenschmidt --- arch/powerpc/platforms/pseries/smp.c | 13 ++++--------- 1 file changed, 4 insertions(+), 9 deletions(-) (limited to 'arch/powerpc/platforms/pseries/smp.c') diff --git a/arch/powerpc/platforms/pseries/smp.c b/arch/powerpc/platforms/pseries/smp.c index e00f96baa381..1a231c389ba0 100644 --- a/arch/powerpc/platforms/pseries/smp.c +++ b/arch/powerpc/platforms/pseries/smp.c @@ -52,8 +52,8 @@ /* - * The primary thread of each non-boot processor is recorded here before - * smp init. + * The Primary thread of each non-boot processor was started from the OF client + * interface by prom_hold_cpus and is spinning on secondary_hold_spinloop. */ static cpumask_t of_spin_map; @@ -161,8 +161,7 @@ static void __devinit smp_pSeries_kick_cpu(int nr) static int smp_pSeries_cpu_bootable(unsigned int nr) { /* Special case - we inhibit secondary thread startup - * during boot if the user requests it. Odd-numbered - * cpus are assumed to be secondary threads. + * during boot if the user requests it. */ if (system_state < SYSTEM_RUNNING && cpu_has_feature(CPU_FTR_SMT) && @@ -199,11 +198,7 @@ static void __init smp_init_pseries(void) /* Mark threads which are still spinning in hold loops. */ if (cpu_has_feature(CPU_FTR_SMT)) { for_each_present_cpu(i) { - if (i % 2 == 0) - /* - * Even-numbered logical cpus correspond to - * primary threads. - */ + if (cpu_thread_in_core(i) == 0) cpu_set(i, of_spin_map); } } else { -- cgit v1.2.1