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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2007-10-25 15:27:44 +1000 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2007-12-03 13:56:25 +1100 |
| commit | 8d089085a4e6d8a91c954130cb4caebd50788a08 (patch) | |
| tree | 8f852ded25d15ae8cd84c8260909db787292e260 /arch/powerpc/platforms/pseries/smp.c | |
| parent | b80fa3cce7390185e43ea22e9b3c38ab138bc580 (diff) | |
| download | op-kernel-dev-8d089085a4e6d8a91c954130cb4caebd50788a08.zip op-kernel-dev-8d089085a4e6d8a91c954130cb4caebd50788a08.tar.gz | |
[POWERPC] Cleanup SMT thread handling
This cleans up the SMT thread handling, removing some hard coded
assumptions and providing a set of helpers to convert between linux
cpu numbers, thread numbers and cores.
This implementation requires the number of threads per core to be a
power of 2 and identical on all cores in the system, but it's an
implementation detail, not an API requirement and so this limitation
can be lifted in the future if anybody ever needs it.
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/platforms/pseries/smp.c')
| -rw-r--r-- | arch/powerpc/platforms/pseries/smp.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/powerpc/platforms/pseries/smp.c b/arch/powerpc/platforms/pseries/smp.c index 116305b..ea4c659 100644 --- a/arch/powerpc/platforms/pseries/smp.c +++ b/arch/powerpc/platforms/pseries/smp.c @@ -46,6 +46,7 @@ #include <asm/pSeries_reconfig.h> #include <asm/mpic.h> #include <asm/vdso_datapage.h> +#include <asm/cputhreads.h> #include "plpar_wrappers.h" #include "pseries.h" @@ -202,7 +203,7 @@ static int smp_pSeries_cpu_bootable(unsigned int nr) */ if (system_state < SYSTEM_RUNNING && cpu_has_feature(CPU_FTR_SMT) && - !smt_enabled_at_boot && nr % 2 != 0) + !smt_enabled_at_boot && cpu_thread_in_core(nr) != 0) return 0; return 1; |
