x86: replace percpu_xxx funcs with this_cpu_xxx
Since percpu_xxx() serial functions are duplicated with this_cpu_xxx().
Removing percpu_xxx() definition and replacing them by this_cpu_xxx()
in code. There is no function change in this patch, just preparation for
later percpu_xxx serial function removing.
On x86 machine the this_cpu_xxx() serial functions are same as
__this_cpu_xxx() without no unnecessary premmpt enable/disable.
Thanks for Stephen Rothwell, he found and fixed a i386 build error in
the patch.
Also thanks for Andrew Morton, he kept updating the patchset in Linus'
tree.
Signed-off-by: Alex Shi <alex.shi@intel.com>
Acked-by: Christoph Lameter <cl@gentwo.org>
Acked-by: Tejun Heo <tj@kernel.org>
Acked-by: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index cf79302..82f29e7 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -1185,7 +1185,7 @@
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 d086a09..c0276d5 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -583,7 +583,7 @@
struct mce m;
int i;
- percpu_inc(mce_poll_count);
+ this_cpu_inc(mce_poll_count);
mce_gather_info(&m, NULL);
@@ -1015,7 +1015,7 @@
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/i387.c b/arch/x86/kernel/i387.c
index 2d6e649..f250431 100644
--- a/arch/x86/kernel/i387.c
+++ b/arch/x86/kernel/i387.c
@@ -88,7 +88,7 @@
__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();
}
}
diff --git a/arch/x86/kernel/nmi_selftest.c b/arch/x86/kernel/nmi_selftest.c
index 2c39dcd..ff36986 100644
--- a/arch/x86/kernel/nmi_selftest.c
+++ b/arch/x86/kernel/nmi_selftest.c
@@ -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>
diff --git a/arch/x86/kernel/paravirt.c b/arch/x86/kernel/paravirt.c
index ab13760..9ce8859 100644
--- a/arch/x86/kernel/paravirt.c
+++ b/arch/x86/kernel/paravirt.c
@@ -241,16 +241,16 @@
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 @@
{
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 @@
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.c b/arch/x86/kernel/process.c
index 1d92a5a..857adff 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -377,7 +377,7 @@
#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);
}
diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index ae68473..01d8d40 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -302,7 +302,7 @@
switch_fpu_finish(next_p, fpu);
- 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 43d8b48..28e8102 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -237,7 +237,7 @@
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 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);