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Subject[PATCH v2] x86: Move per cpu cpu_llc_shared_map to a field in struct cpuinfo_x86
Date
Commit 141168c36cde ("x86: Simplify code by removing a !SMP #ifdefs from
'struct cpuinfo_x86'") caused the compilation error:

mce_amd.c:(.cpuinit.text+0x4723): undefined reference to 'cpu_llc_shared_map'

by removing an #ifdef CONFIG_SMP around a block containing a reference
to cpu_llc_shared_map. Rather than replace the #ifdef, move
cpu_llc_shared_map to be a new cpumask_t field llc_shared_map in
struct cpuinfo_x86 and adjust all references to cpu_llc_shared_map.

The size effects on various kernels are as follows:

text data bss dec hex filename
5281572 513296 1044480 6839348 685c34 vmlinux.up
5281572 513296 1044480 6839348 685c34 vmlinux.up.patched
5548860 516792 1110016 7175668 6d7df4 vmlinux.smp.2
5548837 516792 1110016 7175645 6d7ddd vmlinux.smp.2.patched
5595965 706840 1310720 7613525 742c55 vmlinux.smp.max
5595876 707880 1310720 7614476 74300c vmlinux.smp.max.patched

It can be seen that this change has no effect on UP, a minor effect for
SMP with Max 2 CPUs, and a more substantial but still not overly large
effect for MAXSMP.

Signed-off-by: Kevin Winchester <kjwinchester@gmail.com>
---
I'm still wondering if I should I give the same treatment to:

cpu_sibling_map
cpu_core_map
cpu_llc_id
cpu_number

or is that going too far?

arch/x86/include/asm/processor.h | 1 +
arch/x86/include/asm/smp.h | 6 ------
arch/x86/kernel/cpu/intel_cacheinfo.c | 4 ++--
arch/x86/kernel/cpu/mcheck/mce_amd.c | 7 ++++---
arch/x86/kernel/smpboot.c | 15 ++++++---------
arch/x86/xen/smp.c | 1 -
6 files changed, 13 insertions(+), 21 deletions(-)
diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index aa9088c..dde36b4 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -110,6 +110,7 @@ struct cpuinfo_x86 {
/* Index into per_cpu list: */
u16 cpu_index;
u32 microcode;
+ cpumask_t llc_shared_map;
} __attribute__((__aligned__(SMP_CACHE_BYTES)));

#define X86_VENDOR_INTEL 0
diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h
index 0434c40..f7599d0 100644
--- a/arch/x86/include/asm/smp.h
+++ b/arch/x86/include/asm/smp.h
@@ -34,7 +34,6 @@ static inline bool cpu_has_ht_siblings(void)
DECLARE_PER_CPU(cpumask_var_t, cpu_sibling_map);
DECLARE_PER_CPU(cpumask_var_t, cpu_core_map);
/* cpus sharing the last level cache: */
-DECLARE_PER_CPU(cpumask_var_t, cpu_llc_shared_map);
DECLARE_PER_CPU(u16, cpu_llc_id);
DECLARE_PER_CPU(int, cpu_number);

@@ -48,11 +47,6 @@ static inline struct cpumask *cpu_core_mask(int cpu)
return per_cpu(cpu_core_map, cpu);
}

-static inline struct cpumask *cpu_llc_shared_mask(int cpu)
-{
- return per_cpu(cpu_llc_shared_map, cpu);
-}
-
DECLARE_EARLY_PER_CPU(u16, x86_cpu_to_apicid);
DECLARE_EARLY_PER_CPU(u16, x86_bios_cpu_apicid);
#if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86_32)
diff --git a/arch/x86/kernel/cpu/intel_cacheinfo.c b/arch/x86/kernel/cpu/intel_cacheinfo.c
index 73d08ed..a9cd551 100644
--- a/arch/x86/kernel/cpu/intel_cacheinfo.c
+++ b/arch/x86/kernel/cpu/intel_cacheinfo.c
@@ -734,11 +734,11 @@ static int __cpuinit cache_shared_amd_cpu_map_setup(unsigned int cpu, int index)
ret = 0;
if (index == 3) {
ret = 1;
- for_each_cpu(i, cpu_llc_shared_mask(cpu)) {
+ for_each_cpu(i, &c->llc_shared_map) {
if (!per_cpu(ici_cpuid4_info, i))
continue;
this_leaf = CPUID4_INFO_IDX(i, index);
- for_each_cpu(sibling, cpu_llc_shared_mask(cpu)) {
+ for_each_cpu(sibling, &c->llc_shared_map) {
if (!cpu_online(sibling))
continue;
set_bit(sibling, this_leaf->shared_cpu_map);
diff --git a/arch/x86/kernel/cpu/mcheck/mce_amd.c b/arch/x86/kernel/cpu/mcheck/mce_amd.c
index 786e76a..5e0ec2c 100644
--- a/arch/x86/kernel/cpu/mcheck/mce_amd.c
+++ b/arch/x86/kernel/cpu/mcheck/mce_amd.c
@@ -525,11 +525,12 @@ static __cpuinit int threshold_create_bank(unsigned int cpu, unsigned int bank)
struct threshold_bank *b = NULL;
struct device *dev = mce_device[cpu];
char name[32];
+ struct cpuinfo_x86 *c = &cpu_data(cpu);

sprintf(name, "threshold_bank%i", bank);

- if (cpu_data(cpu).cpu_core_id && shared_bank[bank]) { /* symlink */
- i = cpumask_first(cpu_llc_shared_mask(cpu));
+ if (c->cpu_core_id && shared_bank[bank]) { /* symlink */
+ i = cpumask_first(&c->llc_shared_map);

/* first core not up yet */
if (cpu_data(i).cpu_core_id)
@@ -548,7 +549,7 @@ static __cpuinit int threshold_create_bank(unsigned int cpu, unsigned int bank)
if (err)
goto out;

- cpumask_copy(b->cpus, cpu_llc_shared_mask(cpu));
+ cpumask_copy(b->cpus, &c->llc_shared_map);
per_cpu(threshold_banks, cpu)[bank] = b;

goto out;
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 66d250c..4451a3a 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -127,8 +127,6 @@ EXPORT_PER_CPU_SYMBOL(cpu_sibling_map);
DEFINE_PER_CPU(cpumask_var_t, cpu_core_map);
EXPORT_PER_CPU_SYMBOL(cpu_core_map);

-DEFINE_PER_CPU(cpumask_var_t, cpu_llc_shared_map);
-
/* Per CPU bogomips and other parameters */
DEFINE_PER_CPU_SHARED_ALIGNED(struct cpuinfo_x86, cpu_info);
EXPORT_PER_CPU_SYMBOL(cpu_info);
@@ -337,8 +335,8 @@ static void __cpuinit link_thread_siblings(int cpu1, int cpu2)
cpumask_set_cpu(cpu2, cpu_sibling_mask(cpu1));
cpumask_set_cpu(cpu1, cpu_core_mask(cpu2));
cpumask_set_cpu(cpu2, cpu_core_mask(cpu1));
- cpumask_set_cpu(cpu1, cpu_llc_shared_mask(cpu2));
- cpumask_set_cpu(cpu2, cpu_llc_shared_mask(cpu1));
+ cpumask_set_cpu(cpu1, &cpu_data(cpu2).llc_shared_map);
+ cpumask_set_cpu(cpu2, &cpu_data(cpu1).llc_shared_map);
}


@@ -367,7 +365,7 @@ void __cpuinit set_cpu_sibling_map(int cpu)
cpumask_set_cpu(cpu, cpu_sibling_mask(cpu));
}

- cpumask_set_cpu(cpu, cpu_llc_shared_mask(cpu));
+ cpumask_set_cpu(cpu, &c->llc_shared_map);

if (__this_cpu_read(cpu_info.x86_max_cores) == 1) {
cpumask_copy(cpu_core_mask(cpu), cpu_sibling_mask(cpu));
@@ -378,8 +376,8 @@ void __cpuinit set_cpu_sibling_map(int cpu)
for_each_cpu(i, cpu_sibling_setup_mask) {
if (per_cpu(cpu_llc_id, cpu) != BAD_APICID &&
per_cpu(cpu_llc_id, cpu) == per_cpu(cpu_llc_id, i)) {
- cpumask_set_cpu(i, cpu_llc_shared_mask(cpu));
- cpumask_set_cpu(cpu, cpu_llc_shared_mask(i));
+ cpumask_set_cpu(i, &c->llc_shared_map);
+ cpumask_set_cpu(cpu, &cpu_data(i).llc_shared_map);
}
if (c->phys_proc_id == cpu_data(i).phys_proc_id) {
cpumask_set_cpu(i, cpu_core_mask(cpu));
@@ -418,7 +416,7 @@ const struct cpumask *cpu_coregroup_mask(int cpu)
!(cpu_has(c, X86_FEATURE_AMD_DCM)))
return cpu_core_mask(cpu);
else
- return cpu_llc_shared_mask(cpu);
+ return &c->llc_shared_map;
}

static void impress_friends(void)
@@ -1053,7 +1051,6 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus)
for_each_possible_cpu(i) {
zalloc_cpumask_var(&per_cpu(cpu_sibling_map, i), GFP_KERNEL);
zalloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL);
- zalloc_cpumask_var(&per_cpu(cpu_llc_shared_map, i), GFP_KERNEL);
}
set_cpu_sibling_map(0);

diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 041d4fe..a898ed5 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -225,7 +225,6 @@ static void __init xen_smp_prepare_cpus(unsigned int max_cpus)
for_each_possible_cpu(i) {
zalloc_cpumask_var(&per_cpu(cpu_sibling_map, i), GFP_KERNEL);
zalloc_cpumask_var(&per_cpu(cpu_core_map, i), GFP_KERNEL);
- zalloc_cpumask_var(&per_cpu(cpu_llc_shared_map, i), GFP_KERNEL);
}
set_cpu_sibling_map(0);

--
1.7.9


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