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Subject[PATCH v2 3/5] x86: use this_cpu_xxx replace percpu_xxx funcs
Date
Since percpu_xxx() serial functions are duplicate with this_cpu_xxx().
Removing percpu_xxx() definition and replacing them by this_cpu_xxx() in
code.

And further more, as Christoph Lameter's requirement, I try to use
__this_cpu_xx to replace this_cpu_xxx if it is in preempt safe scenario.
The preempt safe scenarios include:
1, in irq/softirq/nmi handler
2, protected by preempt_disable
3, protected by spin_lock
4, if the code context imply that it is preempt safe, like the code is
follows or be followed a preempt safe code.

BTW, In fact, this_cpu_xxx are same as __this_cpu_xxx since all funcs
implement in a single instruction for x86 machine. But it maybe
different for other platforms, so, doing this distinguish is helpful for
other platforms' performance.
Signed-off-by: Alex Shi <alex.shi@intel.com>
Acked-by: Christoph Lameter <cl@gentwo.org>
Acked-by: Tejun Heo <tj@kernel.org>
---
arch/x86/include/asm/hardirq.h | 9 +++++----
arch/x86/include/asm/irq_regs.h | 4 ++--
arch/x86/include/asm/mmu_context.h | 12 ++++++------
arch/x86/include/asm/percpu.h | 2 +-
arch/x86/include/asm/smp.h | 4 ++--
arch/x86/include/asm/stackprotector.h | 4 ++--
arch/x86/include/asm/tlbflush.h | 4 ++--
arch/x86/kernel/cpu/common.c | 2 +-
arch/x86/kernel/cpu/mcheck/mce.c | 4 ++--
arch/x86/kernel/paravirt.c | 12 ++++++------
arch/x86/kernel/process_32.c | 2 +-
arch/x86/kernel/process_64.c | 12 ++++++------
arch/x86/mm/tlb.c | 10 +++++-----
include/linux/topology.h | 4 ++--
14 files changed, 43 insertions(+), 42 deletions(-)
diff --git a/arch/x86/include/asm/hardirq.h b/arch/x86/include/asm/hardirq.h
index da0b3ca..b6e5c83 100644
--- a/arch/x86/include/asm/hardirq.h
+++ b/arch/x86/include/asm/hardirq.h
@@ -36,14 +36,15 @@ DECLARE_PER_CPU_SHARED_ALIGNED(irq_cpustat_t, irq_stat);

#define __ARCH_IRQ_STAT

-#define inc_irq_stat(member) percpu_inc(irq_stat.member)
+#define inc_irq_stat(member) __this_cpu_inc(irq_stat.member)

-#define local_softirq_pending() percpu_read(irq_stat.__softirq_pending)
+#define local_softirq_pending() __this_cpu_read(irq_stat.__softirq_pending)

#define __ARCH_SET_SOFTIRQ_PENDING

-#define set_softirq_pending(x) percpu_write(irq_stat.__softirq_pending, (x))
-#define or_softirq_pending(x) percpu_or(irq_stat.__softirq_pending, (x))
+#define set_softirq_pending(x) \
+ __this_cpu_write(irq_stat.__softirq_pending, (x))
+#define or_softirq_pending(x) __this_cpu_or(irq_stat.__softirq_pending, (x))

extern void ack_bad_irq(unsigned int irq);

diff --git a/arch/x86/include/asm/irq_regs.h b/arch/x86/include/asm/irq_regs.h
index 7784322..15639ed 100644
--- a/arch/x86/include/asm/irq_regs.h
+++ b/arch/x86/include/asm/irq_regs.h
@@ -15,7 +15,7 @@ DECLARE_PER_CPU(struct pt_regs *, irq_regs);

static inline struct pt_regs *get_irq_regs(void)
{
- return percpu_read(irq_regs);
+ return __this_cpu_read(irq_regs);
}

static inline struct pt_regs *set_irq_regs(struct pt_regs *new_regs)
@@ -23,7 +23,7 @@ static inline struct pt_regs *set_irq_regs(struct pt_regs *new_regs)
struct pt_regs *old_regs;

old_regs = get_irq_regs();
- percpu_write(irq_regs, new_regs);
+ __this_cpu_write(irq_regs, new_regs);

return old_regs;
}
diff --git a/arch/x86/include/asm/mmu_context.h b/arch/x86/include/asm/mmu_context.h
index 6902152..02ca533 100644
--- a/arch/x86/include/asm/mmu_context.h
+++ b/arch/x86/include/asm/mmu_context.h
@@ -25,8 +25,8 @@ void destroy_context(struct mm_struct *mm);
static inline void enter_lazy_tlb(struct mm_struct *mm, struct task_struct *tsk)
{
#ifdef CONFIG_SMP
- if (percpu_read(cpu_tlbstate.state) == TLBSTATE_OK)
- percpu_write(cpu_tlbstate.state, TLBSTATE_LAZY);
+ if (__this_cpu_read(cpu_tlbstate.state) == TLBSTATE_OK)
+ __this_cpu_write(cpu_tlbstate.state, TLBSTATE_LAZY);
#endif
}

@@ -37,8 +37,8 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,

if (likely(prev != next)) {
#ifdef CONFIG_SMP
- percpu_write(cpu_tlbstate.state, TLBSTATE_OK);
- percpu_write(cpu_tlbstate.active_mm, next);
+ __this_cpu_write(cpu_tlbstate.state, TLBSTATE_OK);
+ __this_cpu_write(cpu_tlbstate.active_mm, next);
#endif
cpumask_set_cpu(cpu, mm_cpumask(next));

@@ -56,8 +56,8 @@ static inline void switch_mm(struct mm_struct *prev, struct mm_struct *next,
}
#ifdef CONFIG_SMP
else {
- percpu_write(cpu_tlbstate.state, TLBSTATE_OK);
- BUG_ON(percpu_read(cpu_tlbstate.active_mm) != next);
+ __this_cpu_write(cpu_tlbstate.state, TLBSTATE_OK);
+ BUG_ON(__this_cpu_read(cpu_tlbstate.active_mm) != next);

if (!cpumask_test_and_set_cpu(cpu, mm_cpumask(next))) {
/* We were in lazy tlb mode and leave_mm disabled
diff --git a/arch/x86/include/asm/percpu.h b/arch/x86/include/asm/percpu.h
index 7a11910..276bbc0 100644
--- a/arch/x86/include/asm/percpu.h
+++ b/arch/x86/include/asm/percpu.h
@@ -46,7 +46,7 @@

#ifdef CONFIG_SMP
#define __percpu_prefix "%%"__stringify(__percpu_seg)":"
-#define __my_cpu_offset percpu_read(this_cpu_off)
+#define __my_cpu_offset __this_cpu_read(this_cpu_off)

/*
* Compared to the generic __my_cpu_offset version, the following
diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h
index 0434c40..e276f6b 100644
--- a/arch/x86/include/asm/smp.h
+++ b/arch/x86/include/asm/smp.h
@@ -188,11 +188,11 @@ extern unsigned disabled_cpus __cpuinitdata;
* from the initial startup. We map APIC_BASE very early in page_setup(),
* so this is correct in the x86 case.
*/
-#define raw_smp_processor_id() (percpu_read(cpu_number))
+#define raw_smp_processor_id() (this_cpu_read(cpu_number))
extern int safe_smp_processor_id(void);

#elif defined(CONFIG_X86_64_SMP)
-#define raw_smp_processor_id() (percpu_read(cpu_number))
+#define raw_smp_processor_id() (this_cpu_read(cpu_number))

#define stack_smp_processor_id() \
({ \
diff --git a/arch/x86/include/asm/stackprotector.h b/arch/x86/include/asm/stackprotector.h
index 1575177..e8a60c9 100644
--- a/arch/x86/include/asm/stackprotector.h
+++ b/arch/x86/include/asm/stackprotector.h
@@ -76,9 +76,9 @@ static __always_inline void boot_init_stack_canary(void)

current->stack_canary = canary;
#ifdef CONFIG_X86_64
- percpu_write(irq_stack_union.stack_canary, canary);
+ __this_cpu_write(irq_stack_union.stack_canary, canary);
#else
- percpu_write(stack_canary.canary, canary);
+ __this_cpu_write(stack_canary.canary, canary);
#endif
}

diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h
index 169be89..e90eec0 100644
--- a/arch/x86/include/asm/tlbflush.h
+++ b/arch/x86/include/asm/tlbflush.h
@@ -156,8 +156,8 @@ DECLARE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate);

static inline void reset_lazy_tlbstate(void)
{
- percpu_write(cpu_tlbstate.state, 0);
- percpu_write(cpu_tlbstate.active_mm, &init_mm);
+ __this_cpu_write(cpu_tlbstate.state, 0);
+ __this_cpu_write(cpu_tlbstate.active_mm, &init_mm);
}

#endif /* SMP */
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 850f296..6fbd2b4 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1167,7 +1167,7 @@ void __cpuinit cpu_init(void)
oist = &per_cpu(orig_ist, cpu);

#ifdef CONFIG_NUMA
- if (cpu != 0 && percpu_read(numa_node) == 0 &&
+ if (cpu != 0 && __this_cpu_read(numa_node) == 0 &&
early_cpu_to_node(cpu) != NUMA_NO_NODE)
set_numa_node(early_cpu_to_node(cpu));
#endif
diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index f22a9f7..78f8900 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -562,7 +562,7 @@ void machine_check_poll(enum mcp_flags flags, mce_banks_t *b)
struct mce m;
int i;

- percpu_inc(mce_poll_count);
+ __this_cpu_inc(mce_poll_count);

mce_gather_info(&m, NULL);

@@ -954,7 +954,7 @@ void do_machine_check(struct pt_regs *regs, long error_code)

atomic_inc(&mce_entry);

- percpu_inc(mce_exception_count);
+ __this_cpu_inc(mce_exception_count);

if (!banks)
goto out;
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index d90272e..2f0c1d1 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -239,16 +239,16 @@ static DEFINE_PER_CPU(enum paravirt_lazy_mode, paravirt_lazy_mode) = PARAVIRT_LA

static inline void enter_lazy(enum paravirt_lazy_mode mode)
{
- BUG_ON(percpu_read(paravirt_lazy_mode) != PARAVIRT_LAZY_NONE);
+ BUG_ON(__this_cpu_read(paravirt_lazy_mode) != PARAVIRT_LAZY_NONE);

- percpu_write(paravirt_lazy_mode, mode);
+ __this_cpu_write(paravirt_lazy_mode, mode);
}

static void leave_lazy(enum paravirt_lazy_mode mode)
{
- BUG_ON(percpu_read(paravirt_lazy_mode) != mode);
+ BUG_ON(__this_cpu_read(paravirt_lazy_mode) != mode);

- percpu_write(paravirt_lazy_mode, PARAVIRT_LAZY_NONE);
+ __this_cpu_write(paravirt_lazy_mode, PARAVIRT_LAZY_NONE);
}

void paravirt_enter_lazy_mmu(void)
@@ -265,7 +265,7 @@ void paravirt_start_context_switch(struct task_struct *prev)
{
BUG_ON(preemptible());

- if (percpu_read(paravirt_lazy_mode) == PARAVIRT_LAZY_MMU) {
+ if (__this_cpu_read(paravirt_lazy_mode) == PARAVIRT_LAZY_MMU) {
arch_leave_lazy_mmu_mode();
set_ti_thread_flag(task_thread_info(prev), TIF_LAZY_MMU_UPDATES);
}
@@ -287,7 +287,7 @@ enum paravirt_lazy_mode paravirt_get_lazy_mode(void)
if (in_interrupt())
return PARAVIRT_LAZY_NONE;

- return percpu_read(paravirt_lazy_mode);
+ return __this_cpu_read(paravirt_lazy_mode);
}

void arch_flush_lazy_mmu_mode(void)
diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index 485204f..6acfb80 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -377,7 +377,7 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
if (prev->gs | next->gs)
lazy_load_gs(next->gs);

- percpu_write(current_task, next_p);
+ __this_cpu_write(current_task, next_p);

return prev_p;
}
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 9b9fe4a..1b434d3 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -74,7 +74,7 @@ EXPORT_SYMBOL_GPL(idle_notifier_unregister);

void enter_idle(void)
{
- percpu_write(is_idle, 1);
+ __this_cpu_write(is_idle, 1);
atomic_notifier_call_chain(&idle_notifier, IDLE_START, NULL);
}

@@ -343,7 +343,7 @@ start_thread_common(struct pt_regs *regs, unsigned long new_ip,
load_gs_index(0);
regs->ip = new_ip;
regs->sp = new_sp;
- percpu_write(old_rsp, new_sp);
+ this_cpu_write(old_rsp, new_sp);
regs->cs = _cs;
regs->ss = _ss;
regs->flags = X86_EFLAGS_IF;
@@ -477,11 +477,11 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
/*
* Switch the PDA and FPU contexts.
*/
- prev->usersp = percpu_read(old_rsp);
- percpu_write(old_rsp, next->usersp);
- percpu_write(current_task, next_p);
+ prev->usersp = __this_cpu_read(old_rsp);
+ __this_cpu_write(old_rsp, next->usersp);
+ __this_cpu_write(current_task, next_p);

- percpu_write(kernel_stack,
+ __this_cpu_write(kernel_stack,
(unsigned long)task_stack_page(next_p) +
THREAD_SIZE - KERNEL_STACK_OFFSET);

diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
index d6c0418..e931db0 100644
--- a/arch/x86/mm/tlb.c
+++ b/arch/x86/mm/tlb.c
@@ -61,10 +61,10 @@ static DEFINE_PER_CPU_READ_MOSTLY(int, tlb_vector_offset);
*/
void leave_mm(int cpu)
{
- if (percpu_read(cpu_tlbstate.state) == TLBSTATE_OK)
+ if (__this_cpu_read(cpu_tlbstate.state) == TLBSTATE_OK)
BUG();
cpumask_clear_cpu(cpu,
- mm_cpumask(percpu_read(cpu_tlbstate.active_mm)));
+ mm_cpumask(__this_cpu_read(cpu_tlbstate.active_mm)));
load_cr3(swapper_pg_dir);
}
EXPORT_SYMBOL_GPL(leave_mm);
@@ -152,8 +152,8 @@ void smp_invalidate_interrupt(struct pt_regs *regs)
* BUG();
*/

- if (f->flush_mm == percpu_read(cpu_tlbstate.active_mm)) {
- if (percpu_read(cpu_tlbstate.state) == TLBSTATE_OK) {
+ if (f->flush_mm == __this_cpu_read(cpu_tlbstate.active_mm)) {
+ if (__this_cpu_read(cpu_tlbstate.state) == TLBSTATE_OK) {
if (f->flush_va == TLB_FLUSH_ALL)
local_flush_tlb();
else
@@ -322,7 +322,7 @@ void flush_tlb_page(struct vm_area_struct *vma, unsigned long va)
static void do_flush_tlb_all(void *info)
{
__flush_tlb_all();
- if (percpu_read(cpu_tlbstate.state) == TLBSTATE_LAZY)
+ if (__this_cpu_read(cpu_tlbstate.state) == TLBSTATE_LAZY)
leave_mm(smp_processor_id());
}

diff --git a/include/linux/topology.h b/include/linux/topology.h
index e26db03..b480403 100644
--- a/include/linux/topology.h
+++ b/include/linux/topology.h
@@ -239,7 +239,7 @@ static inline int cpu_to_node(int cpu)
#ifndef set_numa_node
static inline void set_numa_node(int node)
{
- percpu_write(numa_node, node);
+ __this_cpu_write(numa_node, node);
}
#endif

@@ -274,7 +274,7 @@ DECLARE_PER_CPU(int, _numa_mem_);
#ifndef set_numa_mem
static inline void set_numa_mem(int node)
{
- percpu_write(_numa_mem_, node);
+ __this_cpu_write(_numa_mem_, node);
}
#endif

--
1.6.3.3


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