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Subject[PATCH 1/3] core: Provide an arch independent means of accessing cpu_sibling_map
As the block/blktrace.c and kernel/sched.c are common (core) files for
all architectures, an access function has been defined for referencing
the cpu_sibling_map array.

Signed-off-by: Mike Travis <travis@sgi.com>
---
arch/ia64/Kconfig | 1 -
block/blktrace.c | 2 +-
include/asm-i386/smp.h | 1 +
include/asm-x86_64/smp.h | 1 +
include/linux/smp.h | 6 ++++++
kernel/sched.c | 8 ++++----
6 files changed, 13 insertions(+), 6 deletions(-)
--- a/arch/ia64/Kconfig
+++ b/arch/ia64/Kconfig
@@ -308,7 +308,6 @@
config SCHED_SMT
bool "SMT scheduler support"
depends on SMP
- depends on BROKEN
help
Improves the CPU scheduler's decision making when dealing with
Intel IA64 chips with MultiThreading at a cost of slightly increased
--- a/block/blktrace.c
+++ b/block/blktrace.c
@@ -536,7 +536,7 @@
for_each_online_cpu(cpu) {
unsigned long long *cpu_off, *sibling_off;

- for_each_cpu_mask(i, per_cpu(cpu_sibling_map, cpu)) {
+ for_each_cpu_mask(i, cpu_sibling_map(cpu)) {
if (i == cpu)
continue;

--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -5905,7 +5905,7 @@
struct sched_group **sg)
{
int group;
- cpumask_t mask = per_cpu(cpu_sibling_map, cpu);
+ cpumask_t mask = cpu_sibling_map(cpu);
cpus_and(mask, mask, *cpu_map);
group = first_cpu(mask);
if (sg)
@@ -5934,7 +5934,7 @@
cpus_and(mask, mask, *cpu_map);
group = first_cpu(mask);
#elif defined(CONFIG_SCHED_SMT)
- cpumask_t mask = per_cpu(cpu_sibling_map, cpu);
+ cpumask_t mask = cpu_sibling_map(cpu);
cpus_and(mask, mask, *cpu_map);
group = first_cpu(mask);
#else
@@ -6169,7 +6169,7 @@
p = sd;
sd = &per_cpu(cpu_domains, i);
*sd = SD_SIBLING_INIT;
- sd->span = per_cpu(cpu_sibling_map, i);
+ sd->span = cpu_sibling_map(i);
cpus_and(sd->span, sd->span, *cpu_map);
sd->parent = p;
p->child = sd;
@@ -6180,7 +6180,7 @@
#ifdef CONFIG_SCHED_SMT
/* Set up CPU (sibling) groups */
for_each_cpu_mask(i, *cpu_map) {
- cpumask_t this_sibling_map = per_cpu(cpu_sibling_map, i);
+ cpumask_t this_sibling_map = cpu_sibling_map(i);
cpus_and(this_sibling_map, this_sibling_map, *cpu_map);
if (i != first_cpu(this_sibling_map))
continue;
--- a/include/asm-i386/smp.h
+++ b/include/asm-i386/smp.h
@@ -32,6 +32,7 @@
extern int smp_num_siblings;
DECLARE_PER_CPU(cpumask_t, cpu_sibling_map);
DECLARE_PER_CPU(cpumask_t, cpu_core_map);
+#define cpu_sibling_map(cpu) per_cpu(cpu_sibling_map, cpu)

extern void (*mtrr_hook) (void);
extern void zap_low_mappings (void);
--- a/include/asm-x86_64/smp.h
+++ b/include/asm-x86_64/smp.h
@@ -47,6 +47,7 @@
DECLARE_PER_CPU(cpumask_t, cpu_sibling_map);
DECLARE_PER_CPU(cpumask_t, cpu_core_map);
DECLARE_PER_CPU(u8, cpu_llc_id);
+#define cpu_sibling_map(cpu) per_cpu(cpu_sibling_map, cpu)

#define SMP_TRAMPOLINE_BASE 0x6000

--- a/include/linux/smp.h
+++ b/include/linux/smp.h
@@ -18,6 +18,12 @@
#include <linux/thread_info.h>
#include <asm/smp.h>

+#ifdef CONFIG_SCHED_SMT
+#ifndef cpu_sibling_map
+#define cpu_sibling_map(cpu) cpu_sibling_map[cpu]
+#endif
+#endif
+
/*
* main cross-CPU interfaces, handles INIT, TLB flush, STOP, etc.
* (defined in asm header):
--
-
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