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| author | Milton Miller <miltonm@bga.com> | 2008-10-20 15:37:03 +0000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2008-10-21 15:19:12 +1100 |
| commit | 6a75a6b8e85e92cc774d42a4e113c76c30b5a539 (patch) | |
| tree | cd6b0655ba24655fb3bbdf58601099754a9bf232 /arch/powerpc/platforms/pseries/smp.c | |
| parent | ed7b2144bcc87b2b097553f15a2f96e18ede21b0 (diff) | |
| download | talos-op-linux-6a75a6b8e85e92cc774d42a4e113c76c30b5a539.tar.gz talos-op-linux-6a75a6b8e85e92cc774d42a4e113c76c30b5a539.zip | |
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 <miltonm@bga.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/platforms/pseries/smp.c')
| -rw-r--r-- | arch/powerpc/platforms/pseries/smp.c | 13 |
1 files changed, 4 insertions, 9 deletions
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 { |
