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powerpc: Correct smt_enabled=X boot option for > 2 threads per core

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The 'smt_enabled=X' boot option does not handle values of X > 2.
For Power 7 processors with smt modes of 0,1,2,3, and 4 this does
not work.  This patch allows the smt_enabled option to be set to
any value limited to a max equal to the number of threads per
core.

Signed-off-by: Nathan Fontenot <nfont@austin.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Nathan Fontenot
2010-08-05 07:42:11 +00:00
committed by Benjamin Herrenschmidt
parent 1afb56cf97
commit 954e6da54b
2 changed files with 40 additions and 28 deletions
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11
arch/powerpc/platforms/pseries/smp.c
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@@ -182,10 +182,13 @@ static int smp_pSeries_cpu_bootable(unsigned int nr)
/* Special case - we inhibit secondary thread startup
* during boot if the user requests it.
*/
if (system_state < SYSTEM_RUNNING &&
cpu_has_feature(CPU_FTR_SMT) &&
!smt_enabled_at_boot && cpu_thread_in_core(nr) != 0)
return 0;
if (system_state < SYSTEM_RUNNING && cpu_has_feature(CPU_FTR_SMT)) {
if (!smt_enabled_at_boot && cpu_thread_in_core(nr) != 0)
return 0;
if (smt_enabled_at_boot
&& cpu_thread_in_core(nr) >= smt_enabled_at_boot)
return 0;
}
return 1;
}