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Date: Mon, 20 Feb 2012 22:06:06 -0400
From: Kevin Winchester <kjwinchester@...il.com>
To: Ingo Molnar <mingo@...e.hu>
Cc: Kevin Winchester <kjwinchester@...il.com>,
"H. Peter Anvin" <hpa@...or.com>,
Thomas Gleixner <tglx@...utronix.de>,
Borislav Petkov <bp@...en8.de>,
Randy Dunlap <rdunlap@...otime.net>,
Nick Bowler <nbowler@...iptictech.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH 5/5] x86: Remove #ifdef CONFIG_SMP sections by moving smp_num_siblings into common.c
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@...il.com>
---
arch/x86/include/asm/perf_event_p4.h | 9 +++------
arch/x86/include/asm/smp.h | 6 +-----
arch/x86/include/asm/topology.h | 4 +---
arch/x86/kernel/cpu/amd.c | 4 ----
arch/x86/kernel/cpu/common.c | 6 ++++--
arch/x86/kernel/cpu/proc.c | 5 ++---
arch/x86/kernel/cpu/topology.c | 2 --
arch/x86/kernel/process.c | 3 +--
arch/x86/kernel/smpboot.c | 4 ----
arch/x86/oprofile/nmi_int.c | 6 ------
arch/x86/oprofile/op_model_p4.c | 6 ------
11 files changed, 12 insertions(+), 43 deletions(-)
diff --git a/arch/x86/include/asm/perf_event_p4.h b/arch/x86/include/asm/perf_event_p4.h
index 29a65c2..0d50f33 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
@@ -179,18 +181,13 @@ static inline u64 p4_clear_ht_bit(u64 config)
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 75aea4d..787127e 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 58438a1b..7250ad1 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(&boot_cpu_data.core_map) != 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 1cd9d51..a8b46df 100644
--- a/arch/x86/kernel/cpu/amd.c
+++ b/arch/x86/kernel/cpu/amd.c
@@ -263,7 +263,6 @@ 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 +306,6 @@ 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 +313,6 @@ 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 +323,6 @@ 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 7052410..b2c6e3e 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -47,6 +47,10 @@ 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;
@@ -452,7 +456,6 @@ void __cpuinit cpu_detect_cache_sizes(struct cpuinfo_x86 *c)
void __cpuinit detect_ht(struct cpuinfo_x86 *c)
{
-#ifdef CONFIG_X86_HT
u32 eax, ebx, ecx, edx;
int index_msb, core_bits;
static bool printed;
@@ -498,7 +501,6 @@ out:
c->cpu_core_id);
printed = 1;
}
-#endif
}
static void __cpuinit get_cpu_vendor(struct cpuinfo_x86 *c)
diff --git a/arch/x86/kernel/cpu/proc.c b/arch/x86/kernel/cpu/proc.c
index e6e07c2..aef8b27 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", cpumask_weight(&c->core_map));
@@ -19,7 +19,6 @@ 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/cpu/topology.c b/arch/x86/kernel/cpu/topology.c
index 4397e98..d4ee471 100644
--- a/arch/x86/kernel/cpu/topology.c
+++ b/arch/x86/kernel/cpu/topology.c
@@ -28,7 +28,6 @@
*/
void __cpuinit detect_extended_topology(struct cpuinfo_x86 *c)
{
-#ifdef CONFIG_SMP
unsigned int eax, ebx, ecx, edx, sub_index;
unsigned int ht_mask_width, core_plus_mask_width;
unsigned int core_select_mask, core_level_siblings;
@@ -95,5 +94,4 @@ void __cpuinit detect_extended_topology(struct cpuinfo_x86 *c)
printed = 1;
}
return;
-#endif
}
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 44eefde..d531cd2 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -586,12 +586,11 @@ 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 de23378..a0a6b01 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -112,10 +112,6 @@ 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
}
--
1.7.9
--
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