Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=440a08...
Commit: 440a0857e32a05979fb01fc59ea454a723e80e4b
Parent: 0764bf63da5466474eebf7d21994cf6b106265a3
Author: Nathan Lynch <ntl@pobox.com>
AuthorDate: Sun Jul 27 15:24:53 2008 +1000
Committer: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CommitDate: Mon Jul 28 16:30:51 2008 +1000
powerpc: Make core sibling information available to userspace
Implement the notion of "core siblings" for powerpc. This makes
/sys/devices/system/cpu/cpu*/topology/core_siblings present sensible
values, indicating online CPUs which share an L2 cache.
BenH: Made cpu_to_l2cache() use of_find_node_by_phandle() instead
of IBM-specific open coded search
Signed-off-by: Nathan Lynch <ntl@pobox.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
---
arch/powerpc/kernel/smp.c | 64 ++++++++++++++++++++++++++++++++++++++++
include/asm-powerpc/smp.h | 1 +
include/asm-powerpc/topology.h | 1 +
3 files changed, 66 insertions(+), 0 deletions(-)
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index 3c4d07e..f7a2f81 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -63,10 +63,12 @@ struct thread_info *secondary_ti;
cpumask_t cpu_possible_map = CPU_MASK_NONE;
cpumask_t cpu_online_map = CPU_MASK_NONE;
DEFINE_PER_CPU(cpumask_t, cpu_sibling_map) = CPU_MASK_NONE;
+DEFINE_PER_CPU(cpumask_t, cpu_core_map) = CPU_MASK_NONE;
EXPORT_SYMBOL(cpu_online_map);
EXPORT_SYMBOL(cpu_possible_map);
EXPORT_PER_CPU_SYMBOL(cpu_sibling_map);
+EXPORT_PER_CPU_SYMBOL(cpu_core_map);
/* SMP operations for this machine */
struct smp_ops_t *smp_ops;
@@ -230,6 +232,7 @@ void __devinit smp_prepare_boot_cpu(void)
cpu_set(boot_cpuid, cpu_online_map);
cpu_set(boot_cpuid, per_cpu(cpu_sibling_map, boot_cpuid));
+ cpu_set(boot_cpuid, ...
