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powerpc: Use cpu_thread_in_core in smp_init for of_spin_map

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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>
This commit is contained in:
Milton Miller
2008-10-20 15:37:03 +00:00
committed by Benjamin Herrenschmidt
parent ed7b2144bc
commit 6a75a6b8e8
2 changed files with 7 additions and 16 deletions
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10
arch/powerpc/platforms/cell/smp.c
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@@ -54,8 +54,8 @@
#endif
/*
* 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;
@@ -208,11 +208,7 @@ void __init smp_init_cell(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 {