x86: Replace uses of current_cpu_data with this_cpu ops

Replace all uses of current_cpu_data with this_cpu operations on the
per cpu structure cpu_info.  The scala accesses are replaced with the
matching this_cpu ops which results in smaller and more efficient
code.

In the long run, it might be a good idea to remove cpu_data() macro
too and use per_cpu macro directly.

tj: updated description

Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Ingo Molnar <mingo@elte.hu>
Acked-by: H. Peter Anvin <hpa@zytor.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Tejun Heo <tj@kernel.org>

1 files changed, 6 insertions, 6 deletions

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index ff4e5a113a5b..0720071086d1 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -430,7 +430,7 @@ void __cpuinit set_cpu_sibling_map(int cpu)
 
         cpumask_set_cpu(cpu, c->llc_shared_map);
 
-        if (current_cpu_data.x86_max_cores == 1) {
+        if (__this_cpu_read(cpu_info.x86_max_cores) == 1) {
                 cpumask_copy(cpu_core_mask(cpu), cpu_sibling_mask(cpu));
                 c->booted_cores = 1;
                 return;
@@ -1094,7 +1094,7 @@ void __init native_smp_prepare_cpus(unsigned int max_cpus)
 
         preempt_disable();
         smp_cpu_index_default();
-        current_cpu_data = boot_cpu_data;
+        memcpy(__this_cpu_ptr(&cpu_info), &boot_cpu_data, sizeof(cpu_info));
         cpumask_copy(cpu_callin_mask, cpumask_of(0));
         mb();
         /*
@@ -1397,11 +1397,11 @@ static inline void mwait_play_dead(void)
         int i;
         void *mwait_ptr;
 
-        if (!cpu_has(&current_cpu_data, X86_FEATURE_MWAIT))
+        if (!cpu_has(__this_cpu_ptr(&cpu_info), X86_FEATURE_MWAIT))
                 return;
-        if (!cpu_has(&current_cpu_data, X86_FEATURE_CLFLSH))
+        if (!cpu_has(__this_cpu_ptr(&cpu_info), X86_FEATURE_CLFLSH))
                 return;
-        if (current_cpu_data.cpuid_level < CPUID_MWAIT_LEAF)
+        if (__this_cpu_read(cpu_info.cpuid_level) < CPUID_MWAIT_LEAF)
                 return;
 
         eax = CPUID_MWAIT_LEAF;
@@ -1452,7 +1452,7 @@ static inline void mwait_play_dead(void)
 
 static inline void hlt_play_dead(void)
 {
-        if (current_cpu_data.x86 >= 4)
+        if (__this_cpu_read(cpu_info.x86) >= 4)
                 wbinvd();
 
         while (1) {