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Subject[PATCH v6 5/5] x86: Remove #ifdef CONFIG_SMP sections by moving smp_num_siblings into common.c
Date
smp_num_siblings was defined in arch/x86/kernel/smpboot.c, making it
necessary to wrap any UP relevant code referencing it with #ifdef
CONFIG_SMP.

Instead, move the definition to arch/x86/kernel/cpu/common.c, thus
making it available always.

Signed-off-by: Kevin Winchester <kjwinchester@gmail.com>
---
arch/x86/include/asm/perf_event_p4.h | 14 +++-----------
arch/x86/include/asm/smp.h | 6 +-----
arch/x86/include/asm/topology.h | 4 +---
arch/x86/kernel/cpu/amd.c | 5 +----
arch/x86/kernel/cpu/common.c | 4 ++++
arch/x86/kernel/cpu/perf_event_p4.c | 4 ++--
arch/x86/kernel/cpu/proc.c | 5 ++---
arch/x86/kernel/process.c | 5 ++---
arch/x86/kernel/smpboot.c | 4 ----
arch/x86/oprofile/nmi_int.c | 6 ------
arch/x86/oprofile/op_model_p4.c | 6 ------
11 files changed, 16 insertions(+), 47 deletions(-)
diff --git a/arch/x86/include/asm/perf_event_p4.h b/arch/x86/include/asm/perf_event_p4.h
index 29a65c2..cfe41dc 100644
--- a/arch/x86/include/asm/perf_event_p4.h
+++ b/arch/x86/include/asm/perf_event_p4.h
@@ -8,6 +8,8 @@
#include <linux/cpu.h>
#include <linux/bitops.h>

+#include <asm/smp.h>
+
/*
* NetBurst has performance MSRs shared between
* threads if HT is turned on, ie for both logical
@@ -177,20 +179,10 @@ static inline u64 p4_clear_ht_bit(u64 config)
return config & ~P4_CONFIG_HT;
}

-static inline int p4_ht_active(void)
-{
-#ifdef CONFIG_SMP
- return smp_num_siblings > 1;
-#endif
- return 0;
-}
-
static inline int p4_ht_thread(int cpu)
{
-#ifdef CONFIG_SMP
if (smp_num_siblings == 2)
- return cpu != cpumask_first(&cpu_data(cpu).sibling_map));
-#endif
+ return cpu != cpumask_first(&cpu_data(cpu).sibling_map);
return 0;
}

diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h
index 408152e..8202cda 100644
--- a/arch/x86/include/asm/smp.h
+++ b/arch/x86/include/asm/smp.h
@@ -24,11 +24,7 @@ extern unsigned int num_processors;

static inline bool cpu_has_ht_siblings(void)
{
- bool has_siblings = false;
-#ifdef CONFIG_SMP
- has_siblings = cpu_has_ht && smp_num_siblings > 1;
-#endif
- return has_siblings;
+ return cpu_has_ht && smp_num_siblings > 1;
}

DECLARE_PER_CPU(int, cpu_number);
diff --git a/arch/x86/include/asm/topology.h b/arch/x86/include/asm/topology.h
index 5ffa396..1590480 100644
--- a/arch/x86/include/asm/topology.h
+++ b/arch/x86/include/asm/topology.h
@@ -174,11 +174,9 @@ static inline void arch_fix_phys_package_id(int num, u32 slot)
struct pci_bus;
void x86_pci_root_bus_resources(int bus, struct list_head *resources);

-#ifdef CONFIG_SMP
#define mc_capable() ((boot_cpu_data.x86_max_cores > 1) && \
(cpumask_weight(cpu_core_mask(0)) != nr_cpu_ids))
-#define smt_capable() (smp_num_siblings > 1)
-#endif
+#define smt_capable() (smp_num_siblings > 1)

#ifdef CONFIG_NUMA
extern int get_mp_bus_to_node(int busnum);
diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
index d4c5ff4..2c92761 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -9,6 +9,7 @@
#include <asm/processor.h>
#include <asm/apic.h>
#include <asm/cpu.h>
+#include <asm/smp.h>
#include <asm/pci-direct.h>

#ifdef CONFIG_X86_64
@@ -263,7 +264,6 @@ static int __cpuinit nearby_node(int apicid)
* Assumption: Number of cores in each internal node is the same.
* (2) AMD processors supporting compute units
*/
-#ifdef CONFIG_X86_HT
static void __cpuinit amd_get_topology(struct cpuinfo_x86 *c)
{
u32 nodes, cores_per_cu = 1;
@@ -307,7 +307,6 @@ static void __cpuinit amd_get_topology(struct cpuinfo_x86 *c)
c->compute_unit_id %= cus_per_node;
}
}
-#endif

/*
* On a AMD dual core setup the lower bits of the APIC id distingush the cores.
@@ -315,7 +314,6 @@ static void __cpuinit amd_get_topology(struct cpuinfo_x86 *c)
*/
static void __cpuinit amd_detect_cmp(struct cpuinfo_x86 *c)
{
-#ifdef CONFIG_X86_HT
unsigned bits;

bits = c->x86_coreid_bits;
@@ -326,7 +324,6 @@ static void __cpuinit amd_detect_cmp(struct cpuinfo_x86 *c)
/* use socket ID also for last level cache */
c->llc_id = c->phys_proc_id;
amd_get_topology(c);
-#endif
}

int amd_get_nb_id(int cpu)
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 4448984..f7a6589 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -49,6 +49,10 @@ cpumask_var_t cpu_initialized_mask;
cpumask_var_t cpu_callout_mask;
cpumask_var_t cpu_callin_mask;

+/* Number of siblings per CPU package */
+int smp_num_siblings = 1;
+EXPORT_SYMBOL(smp_num_siblings);
+
/* representing cpus for which sibling maps can be computed */
cpumask_var_t cpu_sibling_setup_mask;

diff --git a/arch/x86/kernel/cpu/perf_event_p4.c b/arch/x86/kernel/cpu/perf_event_p4.c
index a2dfacf..8bc2be2 100644
--- a/arch/x86/kernel/cpu/perf_event_p4.c
+++ b/arch/x86/kernel/cpu/perf_event_p4.c
@@ -775,7 +775,7 @@ static int p4_validate_raw_event(struct perf_event *event)
* if an event is shared across the logical threads
* the user needs special permissions to be able to use it
*/
- if (p4_ht_active() && p4_event_bind_map[v].shared) {
+ if (smt_capable() && p4_event_bind_map[v].shared) {
if (perf_paranoid_cpu() && !capable(CAP_SYS_ADMIN))
return -EACCES;
}
@@ -816,7 +816,7 @@ static int p4_hw_config(struct perf_event *event)
event->hw.config = p4_config_pack_escr(escr) |
p4_config_pack_cccr(cccr);

- if (p4_ht_active() && p4_ht_thread(cpu))
+ if (smt_capable() && p4_ht_thread(cpu))
event->hw.config = p4_set_ht_bit(event->hw.config);

if (event->attr.type == PERF_TYPE_RAW) {
diff --git a/arch/x86/kernel/cpu/proc.c b/arch/x86/kernel/cpu/proc.c
index 8022c66..4fbaacb 100644
--- a/arch/x86/kernel/cpu/proc.c
+++ b/arch/x86/kernel/cpu/proc.c
@@ -1,16 +1,16 @@
-#include <linux/smp.h>
#include <linux/timex.h>
#include <linux/string.h>
#include <linux/seq_file.h>
#include <linux/cpufreq.h>

+#include <asm/smp.h>
+
/*
* Get CPU information for use by the procfs.
*/
static void show_cpuinfo_core(struct seq_file *m, struct cpuinfo_x86 *c,
unsigned int cpu)
{
-#ifdef CONFIG_SMP
if (c->x86_max_cores * smp_num_siblings > 1) {
seq_printf(m, "physical id\t: %d\n", c->phys_proc_id);
seq_printf(m, "siblings\t: %d\n",
@@ -20,7 +20,6 @@ static void show_cpuinfo_core(struct seq_file *m, struct cpuinfo_x86 *c,
seq_printf(m, "apicid\t\t: %d\n", c->apicid);
seq_printf(m, "initial apicid\t: %d\n", c->initial_apicid);
}
-#endif
}

#ifdef CONFIG_X86_32
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 1d92a5a..267535e 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -1,7 +1,6 @@
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/mm.h>
-#include <linux/smp.h>
#include <linux/prctl.h>
#include <linux/slab.h>
#include <linux/sched.h>
@@ -19,6 +18,7 @@
#include <linux/hw_breakpoint.h>
#include <asm/cpu.h>
#include <asm/apic.h>
+#include <asm/smp.h>
#include <asm/syscalls.h>
#include <asm/idle.h>
#include <asm/uaccess.h>
@@ -676,12 +676,11 @@ static void amd_e400_idle(void)

void __cpuinit select_idle_routine(const struct cpuinfo_x86 *c)
{
-#ifdef CONFIG_SMP
if (pm_idle == poll_idle && smp_num_siblings > 1) {
printk_once(KERN_WARNING "WARNING: polling idle and HT enabled,"
" performance may degrade.\n");
}
-#endif
+
if (pm_idle)
return;

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 60729f4..ca85d4f 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -113,10 +113,6 @@ static struct task_struct *idle_thread_array[NR_CPUS] __cpuinitdata ;
#define set_idle_for_cpu(x, p) (idle_thread_array[(x)] = (p))
#endif

-/* Number of siblings per CPU package */
-int smp_num_siblings = 1;
-EXPORT_SYMBOL(smp_num_siblings);
-
/* Per CPU bogomips and other parameters */
DEFINE_PER_CPU_SHARED_ALIGNED(struct cpuinfo_x86, cpu_info);
EXPORT_PER_CPU_SYMBOL(cpu_info);
diff --git a/arch/x86/oprofile/nmi_int.c b/arch/x86/oprofile/nmi_int.c
index 26b8a85..346e7ac 100644
--- a/arch/x86/oprofile/nmi_int.c
+++ b/arch/x86/oprofile/nmi_int.c
@@ -572,11 +572,6 @@ static int __init p4_init(char **cpu_type)
if (cpu_model > 6 || cpu_model == 5)
return 0;

-#ifndef CONFIG_SMP
- *cpu_type = "i386/p4";
- model = &op_p4_spec;
- return 1;
-#else
switch (smp_num_siblings) {
case 1:
*cpu_type = "i386/p4";
@@ -588,7 +583,6 @@ static int __init p4_init(char **cpu_type)
model = &op_p4_ht2_spec;
return 1;
}
-#endif

printk(KERN_INFO "oprofile: P4 HyperThreading detected with > 2 threads\n");
printk(KERN_INFO "oprofile: Reverting to timer mode.\n");
diff --git a/arch/x86/oprofile/op_model_p4.c b/arch/x86/oprofile/op_model_p4.c
index ae3503e..c6bcb22 100644
--- a/arch/x86/oprofile/op_model_p4.c
+++ b/arch/x86/oprofile/op_model_p4.c
@@ -42,21 +42,15 @@ static unsigned int num_controls = NUM_CONTROLS_NON_HT;
kernel boot-time. */
static inline void setup_num_counters(void)
{
-#ifdef CONFIG_SMP
if (smp_num_siblings == 2) {
num_counters = NUM_COUNTERS_HT2;
num_controls = NUM_CONTROLS_HT2;
}
-#endif
}

static inline int addr_increment(void)
{
-#ifdef CONFIG_SMP
return smp_num_siblings == 2 ? 2 : 1;
-#else
- return 1;
-#endif
}


--
1.7.10


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