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Merge branch 'for-3.5' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu

Browse Source 
Pull percpu updates from Tejun Heo:
 "Contains Alex Shi's three patches to remove percpu_xxx() which overlap
  with this_cpu_xxx().  There shouldn't be any functional change."

* 'for-3.5' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu:
  percpu: remove percpu_xxx() functions
  x86: replace percpu_xxx funcs with this_cpu_xxx
  net: replace percpu_xxx funcs with this_cpu_xxx or __this_cpu_xxx
This commit is contained in:
Linus Torvalds 2012-05-22 17:37:47 -07:00
commit f5c101892f
25 changed files with 69 additions and 124 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/x86/include/asm/compat.h
View File

@ -229,7 +229,7 @@ static inline void __user *arch_compat_alloc_user_space(long len)
sp = task_pt_regs(current)->sp;
} else {
/* -128 for the x32 ABI redzone */
sp = percpu_read(old_rsp) - 128;
sp = this_cpu_read(old_rsp) - 128;
}
return (void __user *)round_down(sp - len, 16);

2
arch/x86/include/asm/current.h
View File

@ -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()

1
arch/x86/include/asm/desc.h
View File

@ -6,6 +6,7 @@
#include <asm/mmu.h>
#include <linux/smp.h>
#include <linux/percpu.h>
static inline void fill_ldt(struct desc_struct *desc, const struct user_desc *info)
{

6
arch/x86/include/asm/fpu-internal.h
View File

@ -290,14 +290,14 @@ static inline int __thread_has_fpu(struct task_struct *tsk)
static inline void __thread_clear_has_fpu(struct task_struct *tsk)
{
tsk->thread.fpu.has_fpu = 0;
percpu_write(fpu_owner_task, NULL);
this_cpu_write(fpu_owner_task, NULL);
}
/* Must be paired with a 'clts' before! */
static inline void __thread_set_has_fpu(struct task_struct *tsk)
{
tsk->thread.fpu.has_fpu = 1;
percpu_write(fpu_owner_task, tsk);
this_cpu_write(fpu_owner_task, tsk);
}
/*
@ -344,7 +344,7 @@ typedef struct { int preload; } fpu_switch_t;
*/
static inline int fpu_lazy_restore(struct task_struct *new, unsigned int cpu)
{
return new == percpu_read_stable(fpu_owner_task) &&
return new == this_cpu_read_stable(fpu_owner_task) &&
cpu == new->thread.fpu.last_cpu;
}

9
arch/x86/include/asm/hardirq.h
View File

@ -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);

4
arch/x86/include/asm/irq_regs.h
View File

@ -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;
}

12
arch/x86/include/asm/mmu_context.h
View File

@ -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

24
arch/x86/include/asm/percpu.h
View File

@ -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))
@ -512,7 +504,11 @@ 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,

4
arch/x86/include/asm/smp.h
View File

@ -191,11 +191,11 @@ 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() \
({ \

4
arch/x86/include/asm/stackprotector.h
View File

@ -75,9 +75,9 @@ 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
}

2
arch/x86/include/asm/thread_info.h
View File

@ -204,7 +204,7 @@ 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;
}

4
arch/x86/include/asm/tlbflush.h
View File

@ -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 */

2
arch/x86/kernel/cpu/common.c
View File

@ -1185,7 +1185,7 @@ 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

4
arch/x86/kernel/cpu/mcheck/mce.c
View File

@ -583,7 +583,7 @@ 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);
@ -1017,7 +1017,7 @@ 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;

2
arch/x86/kernel/i387.c
View File

@ -88,7 +88,7 @@ void kernel_fpu_begin(void)
__thread_clear_has_fpu(me);
/* We do 'stts()' in kernel_fpu_end() */
} else {
percpu_write(fpu_owner_task, NULL);
this_cpu_write(fpu_owner_task, NULL);
clts();
}
}

1
arch/x86/kernel/nmi_selftest.c
View File

@ -13,6 +13,7 @@
#include <linux/cpumask.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/percpu.h>
#include <asm/apic.h>
#include <asm/nmi.h>

12
arch/x86/kernel/paravirt.c
View File

@ -241,16 +241,16 @@ 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)
@ -267,7 +267,7 @@ 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);
}
@ -289,7 +289,7 @@ 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)

2
arch/x86/kernel/process.c
View File

@ -385,7 +385,7 @@ static inline void play_dead(void)
#ifdef CONFIG_X86_64
void enter_idle(void)
{
percpu_write(is_idle, 1);
this_cpu_write(is_idle, 1);
atomic_notifier_call_chain(&idle_notifier, IDLE_START, NULL);
}

2
arch/x86/kernel/process_32.c
View File

@ -302,7 +302,7 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
switch_fpu_finish(next_p, fpu);
percpu_write(current_task, next_p);
this_cpu_write(current_task, next_p);
return prev_p;
}

10
arch/x86/kernel/process_64.c
View File

@ -237,7 +237,7 @@ start_thread_common(struct pt_regs *regs, unsigned long new_ip,
current->thread.usersp = new_sp;
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;
@ -359,11 +359,11 @@ __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);

10
arch/x86/mm/tlb.c
View File

@ -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());
}

54
include/linux/percpu.h
View File

@ -165,60 +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.
* The generic versions disable interrupts. Archs are
* encouraged to implement single-instruction alternatives which don't
* require 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
* are called for different scalar sizes of the objects handled.

4
include/linux/topology.h
View File

@ -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

12
net/netfilter/xt_TEE.c
View File

@ -87,7 +87,7 @@ tee_tg4(struct sk_buff *skb, const struct xt_action_param *par)
const struct xt_tee_tginfo *info = par->targinfo;
struct iphdr *iph;
if (percpu_read(tee_active))
if (__this_cpu_read(tee_active))
return XT_CONTINUE;
/*
* Copy the skb, and route the copy. Will later return %XT_CONTINUE for
@ -124,9 +124,9 @@ tee_tg4(struct sk_buff *skb, const struct xt_action_param *par)
ip_send_check(iph);
if (tee_tg_route4(skb, info)) {
percpu_write(tee_active, true);
__this_cpu_write(tee_active, true);
ip_local_out(skb);
percpu_write(tee_active, false);
__this_cpu_write(tee_active, false);
} else {
kfree_skb(skb);
}
@ -168,7 +168,7 @@ tee_tg6(struct sk_buff *skb, const struct xt_action_param *par)
{
const struct xt_tee_tginfo *info = par->targinfo;
if (percpu_read(tee_active))
if (__this_cpu_read(tee_active))
return XT_CONTINUE;
skb = pskb_copy(skb, GFP_ATOMIC);
if (skb == NULL)
@ -186,9 +186,9 @@ tee_tg6(struct sk_buff *skb, const struct xt_action_param *par)
--iph->hop_limit;
}
if (tee_tg_route6(skb, info)) {
percpu_write(tee_active, true);
__this_cpu_write(tee_active, true);
ip6_local_out(skb);
percpu_write(tee_active, false);
__this_cpu_write(tee_active, false);
} else {
kfree_skb(skb);
}

4
net/socket.c
View File

@ -479,7 +479,7 @@ static struct socket *sock_alloc(void)
inode->i_uid = current_fsuid();
inode->i_gid = current_fsgid();
percpu_add(sockets_in_use, 1);
this_cpu_add(sockets_in_use, 1);
return sock;
}
@ -522,7 +522,7 @@ void sock_release(struct socket *sock)
if (rcu_dereference_protected(sock->wq, 1)->fasync_list)
printk(KERN_ERR "sock_release: fasync list not empty!\n");
percpu_sub(sockets_in_use, 1);
this_cpu_sub(sockets_in_use, 1);
if (!sock->file) {
iput(SOCK_INODE(sock));
return;