From 8d089085a4e6d8a91c954130cb4caebd50788a08 Mon Sep 17 00:00:00 2001 From: Benjamin Herrenschmidt Date: Thu, 25 Oct 2007 15:27:44 +1000 Subject: [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 Signed-off-by: Paul Mackerras --- arch/powerpc/platforms/cell/smp.c | 3 ++- arch/powerpc/platforms/pseries/smp.c | 3 ++- 2 files changed, 4 insertions(+), 2 deletions(-) (limited to 'arch/powerpc/platforms') diff --git a/arch/powerpc/platforms/cell/smp.c b/arch/powerpc/platforms/cell/smp.c index e4438456c867..efb3964457b1 100644 --- a/arch/powerpc/platforms/cell/smp.c +++ b/arch/powerpc/platforms/cell/smp.c @@ -42,6 +42,7 @@ #include #include #include +#include #include "interrupt.h" #include @@ -182,7 +183,7 @@ static int smp_cell_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; diff --git a/arch/powerpc/platforms/pseries/smp.c b/arch/powerpc/platforms/pseries/smp.c index 116305b22a2b..ea4c65917a64 100644 --- a/arch/powerpc/platforms/pseries/smp.c +++ b/arch/powerpc/platforms/pseries/smp.c @@ -46,6 +46,7 @@ #include #include #include +#include #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; -- cgit v1.2.2