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| author |   Nathan Fontenot <nfont@austin.ibm.com> | 2010-08-05 07:42:11 +0000 |
|---|---|---|
| committer |   Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2010-08-24 15:26:30 +1000 |
| commit | 954e6da54b2f3a5e2634312db800bc1395c509ee (patch) | |
| tree | 9d5d7e9bab899e694abdc5af716ee878e148351c /arch/powerpc/platforms/pseries/smp.c | |
| parent | powerpc: Silence xics_migrate_irqs_away() during cpu offline (diff) | |
| download | linux-dev-954e6da54b2f3a5e2634312db800bc1395c509ee.tar.xz linux-dev-954e6da54b2f3a5e2634312db800bc1395c509ee.zip | |
powerpc: Correct smt_enabled=X boot option for > 2 threads per core
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>
Diffstat (limited to '')
| -rw-r--r-- | arch/powerpc/platforms/pseries/smp.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/arch/powerpc/platforms/pseries/smp.c b/arch/powerpc/platforms/pseries/smp.c index 3b1bf61c45be..0317cce877c6 100644 --- a/arch/powerpc/platforms/pseries/smp.c +++ b/arch/powerpc/platforms/pseries/smp.c @@ -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; } |