Re: [PATCH 3/3] Code clean up for percpu_xxx() functions

From: Alex,Shi
Date: Mon Nov 21 2011 - 04:10:31 EST

refreshed the patch on latest upstream kernel. Any comments or picking
up are appreciated.

===
>From 0dce61dc88b8ed2687b4d5c0633aa54d1f66fdc0 Mon Sep 17 00:00:00 2001
From: Alex Shi <alex.shi@xxxxxxxxx>
Date: Tue, 22 Nov 2011 00:05:37 +0800
Subject: [PATCH 3/3] Code clean up for percpu_xxx() functions

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.

I left the xen code unchanged, since no idea of them.

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@xxxxxxxxx>
Acked-by: Christoph Lameter <cl@xxxxxxxxxx>
---
arch/x86/include/asm/current.h | 2 +-
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 | 24 ++++++---------
arch/x86/include/asm/smp.h | 4 +-
arch/x86/include/asm/stackprotector.h | 4 +-
arch/x86/include/asm/thread_info.h | 2 +-
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 +++---
arch/x86/xen/enlighten.c | 6 ++--
arch/x86/xen/irq.c | 8 ++--
arch/x86/xen/mmu.c | 20 ++++++------
arch/x86/xen/multicalls.h | 2 +-
arch/x86/xen/smp.c | 2 +-
include/linux/percpu.h | 53 ---------------------------------
include/linux/topology.h | 4 +-
22 files changed, 73 insertions(+), 129 deletions(-)

diff --git a/arch/x86/include/asm/current.h b/arch/x86/include/asm/current.h
index 4d447b7..9476c04 100644
--- a/arch/x86/include/asm/current.h
+++ b/arch/x86/include/asm/current.h
@@ -11,7 +11,7 @@ DECLARE_PER_CPU(struct task_struct *, current_task);

static __always_inline struct task_struct *get_current(void)
{
- return percpu_read_stable(current_task);
+ return this_cpu_read_stable(current_task);
}

#define current get_current()
diff --git a/arch/x86/include/asm/hardirq.h b/arch/x86/include/asm/hardirq.h
index 55e4de6..2890444 100644
--- a/arch/x86/include/asm/hardirq.h
+++ b/arch/x86/include/asm/hardirq.h
@@ -35,14 +35,15 @@ 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 3470c9d..520005e 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
@@ -351,23 +351,15 @@ do { \
})

/*
- * percpu_read() makes gcc load the percpu variable every time it is
- * accessed while percpu_read_stable() allows the value to be cached.
- * percpu_read_stable() is more efficient and can be used if its value
+ * this_cpu_read() makes gcc load the percpu variable every time it is
+ * accessed while this_cpu_read_stable() allows the value to be cached.
+ * this_cpu_read_stable() is more efficient and can be used if its value
* is guaranteed to be valid across cpus. The current users include
* get_current() and get_thread_info() both of which are actually
* per-thread variables implemented as per-cpu variables and thus
* stable for the duration of the respective task.
*/
-#define percpu_read(var) percpu_from_op("mov", var, "m" (var))
-#define percpu_read_stable(var) percpu_from_op("mov", var, "p" (&(var)))
-#define percpu_write(var, val) percpu_to_op("mov", var, val)
-#define percpu_add(var, val) percpu_add_op(var, val)
-#define percpu_sub(var, val) percpu_add_op(var, -(val))
-#define percpu_and(var, val) percpu_to_op("and", var, val)
-#define percpu_or(var, val) percpu_to_op("or", var, val)
-#define percpu_xor(var, val) percpu_to_op("xor", var, val)
-#define percpu_inc(var) percpu_unary_op("inc", var)
+#define this_cpu_read_stable(var) percpu_from_op("mov", var, "p" (&(var)))

#define __this_cpu_read_1(pcp) percpu_from_op("mov", (pcp), "m"(pcp))
#define __this_cpu_read_2(pcp) percpu_from_op("mov", (pcp), "m"(pcp))
@@ -551,7 +543,11 @@ static __always_inline int x86_this_cpu_constant_test_bit(unsigned int nr,
{
unsigned long __percpu *a = (unsigned long *)addr + nr / BITS_PER_LONG;

- return ((1UL << (nr % BITS_PER_LONG)) & percpu_read(*a)) != 0;
+#ifdef CONFIG_X86_64
+ return ((1UL << (nr % BITS_PER_LONG)) & __this_cpu_read_8(*a)) != 0;
+#else
+ return ((1UL << (nr % BITS_PER_LONG)) & __this_cpu_read_4(*a)) != 0;
+#endif
}

static inline int x86_this_cpu_variable_test_bit(int nr,
diff --git a/arch/x86/include/asm/smp.h b/arch/x86/include/asm/smp.h
index 73b11bc..dd5749b 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/thread_info.h b/arch/x86/include/asm/thread_info.h
index a1fe5c1..8b19667 100644
--- a/arch/x86/include/asm/thread_info.h
+++ b/arch/x86/include/asm/thread_info.h
@@ -219,7 +219,7 @@ DECLARE_PER_CPU(unsigned long, kernel_stack);
static inline struct thread_info *current_thread_info(void)
{
struct thread_info *ti;
- ti = (void *)(percpu_read_stable(kernel_stack) +
+ ti = (void *)(this_cpu_read_stable(kernel_stack) +
KERNEL_STACK_OFFSET - THREAD_SIZE);
return ti;
}
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 aa003b1..d9b4fe7 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1163,7 +1163,7 @@ 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 2af127d..b7f3a1e 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -514,7 +514,7 @@ 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);

@@ -906,7 +906,7 @@ 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 795b79f..b383fe8 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -375,7 +375,7 @@ __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 3bd7e6e..7b6edbb 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);
}

@@ -338,7 +338,7 @@ 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;
@@ -472,11 +472,11 @@ __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/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index 1f92865..3622488 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -777,11 +777,11 @@ static DEFINE_PER_CPU(unsigned long, xen_cr0_value);

static unsigned long xen_read_cr0(void)
{
- unsigned long cr0 = percpu_read(xen_cr0_value);
+ unsigned long cr0 = this_cpu_read(xen_cr0_value);

if (unlikely(cr0 == 0)) {
cr0 = native_read_cr0();
- percpu_write(xen_cr0_value, cr0);
+ this_cpu_write(xen_cr0_value, cr0);
}

return cr0;
@@ -791,7 +791,7 @@ static void xen_write_cr0(unsigned long cr0)
{
struct multicall_space mcs;

- percpu_write(xen_cr0_value, cr0);
+ this_cpu_write(xen_cr0_value, cr0);

/* Only pay attention to cr0.TS; everything else is
ignored. */
diff --git a/arch/x86/xen/irq.c b/arch/x86/xen/irq.c
index 8bbb465..1573376 100644
--- a/arch/x86/xen/irq.c
+++ b/arch/x86/xen/irq.c
@@ -26,7 +26,7 @@ static unsigned long xen_save_fl(void)
struct vcpu_info *vcpu;
unsigned long flags;

- vcpu = percpu_read(xen_vcpu);
+ vcpu = this_cpu_read(xen_vcpu);

/* flag has opposite sense of mask */
flags = !vcpu->evtchn_upcall_mask;
@@ -50,7 +50,7 @@ static void xen_restore_fl(unsigned long flags)
make sure we're don't switch CPUs between getting the vcpu
pointer and updating the mask. */
preempt_disable();
- vcpu = percpu_read(xen_vcpu);
+ vcpu = this_cpu_read(xen_vcpu);
vcpu->evtchn_upcall_mask = flags;
preempt_enable_no_resched();

@@ -72,7 +72,7 @@ static void xen_irq_disable(void)
make sure we're don't switch CPUs between getting the vcpu
pointer and updating the mask. */
preempt_disable();
- percpu_read(xen_vcpu)->evtchn_upcall_mask = 1;
+ this_cpu_read(xen_vcpu)->evtchn_upcall_mask = 1;
preempt_enable_no_resched();
}
PV_CALLEE_SAVE_REGS_THUNK(xen_irq_disable);
@@ -86,7 +86,7 @@ static void xen_irq_enable(void)
the caller is confused and is trying to re-enable interrupts
on an indeterminate processor. */

- vcpu = percpu_read(xen_vcpu);
+ vcpu = this_cpu_read(xen_vcpu);
vcpu->evtchn_upcall_mask = 0;

/* Doesn't matter if we get preempted here, because any
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index 87f6673..426ff61 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -1071,14 +1071,14 @@ static void drop_other_mm_ref(void *info)
struct mm_struct *mm = info;
struct mm_struct *active_mm;

- active_mm = percpu_read(cpu_tlbstate.active_mm);
+ active_mm = this_cpu_read(cpu_tlbstate.active_mm);

- if (active_mm == mm && percpu_read(cpu_tlbstate.state) != TLBSTATE_OK)
+ if (active_mm == mm && this_cpu_read(cpu_tlbstate.state) != TLBSTATE_OK)
leave_mm(smp_processor_id());

/* If this cpu still has a stale cr3 reference, then make sure
it has been flushed. */
- if (percpu_read(xen_current_cr3) == __pa(mm->pgd))
+ if (this_cpu_read(xen_current_cr3) == __pa(mm->pgd))
load_cr3(swapper_pg_dir);
}

@@ -1185,17 +1185,17 @@ static void __init xen_pagetable_setup_done(pgd_t *base)

static void xen_write_cr2(unsigned long cr2)
{
- percpu_read(xen_vcpu)->arch.cr2 = cr2;
+ this_cpu_read(xen_vcpu)->arch.cr2 = cr2;
}

static unsigned long xen_read_cr2(void)
{
- return percpu_read(xen_vcpu)->arch.cr2;
+ return this_cpu_read(xen_vcpu)->arch.cr2;
}

unsigned long xen_read_cr2_direct(void)
{
- return percpu_read(xen_vcpu_info.arch.cr2);
+ return this_cpu_read(xen_vcpu_info.arch.cr2);
}

static void xen_flush_tlb(void)
@@ -1278,12 +1278,12 @@ static void xen_flush_tlb_others(const struct cpumask *cpus,

static unsigned long xen_read_cr3(void)
{
- return percpu_read(xen_cr3);
+ return this_cpu_read(xen_cr3);
}

static void set_current_cr3(void *v)
{
- percpu_write(xen_current_cr3, (unsigned long)v);
+ this_cpu_write(xen_current_cr3, (unsigned long)v);
}

static void __xen_write_cr3(bool kernel, unsigned long cr3)
@@ -1306,7 +1306,7 @@ static void __xen_write_cr3(bool kernel, unsigned long cr3)
xen_extend_mmuext_op(&op);

if (kernel) {
- percpu_write(xen_cr3, cr3);
+ this_cpu_write(xen_cr3, cr3);

/* Update xen_current_cr3 once the batch has actually
been submitted. */
@@ -1322,7 +1322,7 @@ static void xen_write_cr3(unsigned long cr3)

/* Update while interrupts are disabled, so its atomic with
respect to ipis */
- percpu_write(xen_cr3, cr3);
+ this_cpu_write(xen_cr3, cr3);

__xen_write_cr3(true, cr3);

diff --git a/arch/x86/xen/multicalls.h b/arch/x86/xen/multicalls.h
index dee79b7..9c2e74f 100644
--- a/arch/x86/xen/multicalls.h
+++ b/arch/x86/xen/multicalls.h
@@ -47,7 +47,7 @@ static inline void xen_mc_issue(unsigned mode)
xen_mc_flush();

/* restore flags saved in xen_mc_batch */
- local_irq_restore(percpu_read(xen_mc_irq_flags));
+ local_irq_restore(this_cpu_read(xen_mc_irq_flags));
}

/* Set up a callback to be called when the current batch is flushed */
diff --git a/arch/x86/xen/smp.c b/arch/x86/xen/smp.c
index 041d4fe..449f868 100644
--- a/arch/x86/xen/smp.c
+++ b/arch/x86/xen/smp.c
@@ -76,7 +76,7 @@ static void __cpuinit cpu_bringup(void)
xen_setup_cpu_clockevents();

set_cpu_online(cpu, true);
- percpu_write(cpu_state, CPU_ONLINE);
+ this_cpu_write(cpu_state, CPU_ONLINE);
wmb();

/* We can take interrupts now: we're officially "up". */
diff --git a/include/linux/percpu.h b/include/linux/percpu.h
index 9ca008f..aad7e1c 100644
--- a/include/linux/percpu.h
+++ b/include/linux/percpu.h
@@ -165,59 +165,6 @@ extern phys_addr_t per_cpu_ptr_to_phys(void *addr);
#define alloc_percpu(type) \
(typeof(type) __percpu *)__alloc_percpu(sizeof(type), __alignof__(type))

-/*
- * Optional methods for optimized non-lvalue per-cpu variable access.
- *
- * @var can be a percpu variable or a field of it and its size should
- * equal char, int or long. percpu_read() evaluates to a lvalue and
- * all others to void.
- *
- * These operations are guaranteed to be atomic w.r.t. preemption.
- * The generic versions use plain get/put_cpu_var(). Archs are
- * encouraged to implement single-instruction alternatives which don't
- * require preemption protection.
- */
-#ifndef percpu_read
-# define percpu_read(var) \
- ({ \
- typeof(var) *pr_ptr__ = &(var); \
- typeof(var) pr_ret__; \
- pr_ret__ = get_cpu_var(*pr_ptr__); \
- put_cpu_var(*pr_ptr__); \
- pr_ret__; \
- })
-#endif
-
-#define __percpu_generic_to_op(var, val, op) \
-do { \
- typeof(var) *pgto_ptr__ = &(var); \
- get_cpu_var(*pgto_ptr__) op val; \
- put_cpu_var(*pgto_ptr__); \
-} while (0)
-
-#ifndef percpu_write
-# define percpu_write(var, val) __percpu_generic_to_op(var, (val), =)
-#endif
-
-#ifndef percpu_add
-# define percpu_add(var, val) __percpu_generic_to_op(var, (val), +=)
-#endif
-
-#ifndef percpu_sub
-# define percpu_sub(var, val) __percpu_generic_to_op(var, (val), -=)
-#endif
-
-#ifndef percpu_and
-# define percpu_and(var, val) __percpu_generic_to_op(var, (val), &=)
-#endif
-
-#ifndef percpu_or
-# define percpu_or(var, val) __percpu_generic_to_op(var, (val), |=)
-#endif
-
-#ifndef percpu_xor
-# define percpu_xor(var, val) __percpu_generic_to_op(var, (val), ^=)
-#endif

/*
* Branching function to split up a function into a set of functions that
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

--
1.7.5.1



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