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Subject[PATCH 2/2 v2] x86, MCE: Clean get_cpu_xxx with this_cpu_xxx
Date
This is a cleanup patch suggested by Peter. Use new
this_cpu_xxx to improve operation speed.

v2 -> v1: Separate cleanup from bug fix.

Signed-off-by: Chen, Gong <gong.chen@linux.intel.com>
Suggested-by: H. Peter Anvin <hpa@zytor.com>
---
arch/x86/kernel/cpu/mcheck/mce.c | 36 +++++++++++++++++-------------------
1 file changed, 17 insertions(+), 19 deletions(-)

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 68317c8..5284189 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -402,7 +402,7 @@ static u64 mce_rdmsrl(u32 msr)

if (offset < 0)
return 0;
- return *(u64 *)((char *)&__get_cpu_var(injectm) + offset);
+ return *(u64 *)((char *)this_cpu_ptr(&injectm) + offset);
}

if (rdmsrl_safe(msr, &v)) {
@@ -424,7 +424,7 @@ static void mce_wrmsrl(u32 msr, u64 v)
int offset = msr_to_offset(msr);

if (offset >= 0)
- *(u64 *)((char *)&__get_cpu_var(injectm) + offset) = v;
+ *(u64 *)((char *)this_cpu_ptr(&injectm) + offset) = v;
return;
}
wrmsrl(msr, v);
@@ -480,7 +480,7 @@ static DEFINE_PER_CPU(struct mce_ring, mce_ring);
/* Runs with CPU affinity in workqueue */
static int mce_ring_empty(void)
{
- struct mce_ring *r = &__get_cpu_var(mce_ring);
+ struct mce_ring *r = this_cpu_ptr(&mce_ring);

return r->start == r->end;
}
@@ -492,7 +492,7 @@ static int mce_ring_get(unsigned long *pfn)

*pfn = 0;
get_cpu();
- r = &__get_cpu_var(mce_ring);
+ r = this_cpu_ptr(&mce_ring);
if (r->start == r->end)
goto out;
*pfn = r->ring[r->start];
@@ -506,7 +506,7 @@ out:
/* Always runs in MCE context with preempt off */
static int mce_ring_add(unsigned long pfn)
{
- struct mce_ring *r = &__get_cpu_var(mce_ring);
+ struct mce_ring *r = this_cpu_ptr(&mce_ring);
unsigned next;

next = (r->end + 1) % MCE_RING_SIZE;
@@ -528,7 +528,7 @@ int mce_available(struct cpuinfo_x86 *c)
static void mce_schedule_work(void)
{
if (!mce_ring_empty())
- schedule_work(&__get_cpu_var(mce_work));
+ schedule_work(this_cpu_ptr(&mce_work));
}

DEFINE_PER_CPU(struct irq_work, mce_irq_work);
@@ -553,7 +553,7 @@ static void mce_report_event(struct pt_regs *regs)
return;
}

- irq_work_queue(&__get_cpu_var(mce_irq_work));
+ irq_work_queue(this_cpu_ptr(&mce_irq_work));
}

/*
@@ -1050,7 +1050,7 @@ void do_machine_check(struct pt_regs *regs, long error_code)

mce_gather_info(&m, regs);

- final = &__get_cpu_var(mces_seen);
+ final = this_cpu_ptr(&mces_seen);
*final = m;

memset(valid_banks, 0, sizeof(valid_banks));
@@ -1282,16 +1282,14 @@ static unsigned long mce_adjust_timer_default(unsigned long interval)
static unsigned long (*mce_adjust_timer)(unsigned long interval) =
mce_adjust_timer_default;

-static int cmc_error_seen(void)
+static inline int cmc_error_seen(void)
{
- unsigned long *v = &__get_cpu_var(mce_polled_error);
-
- return test_and_clear_bit(0, v);
+ return this_cpu_xchg(mce_polled_error, 0);
}

static void mce_timer_fn(unsigned long data)
{
- struct timer_list *t = &__get_cpu_var(mce_timer);
+ struct timer_list *t = this_cpu_ptr(&mce_timer);
unsigned long iv;
int notify;

@@ -1299,7 +1297,7 @@ static void mce_timer_fn(unsigned long data)

if (mce_available(__this_cpu_ptr(&cpu_info))) {
machine_check_poll(MCP_TIMESTAMP,
- &__get_cpu_var(mce_poll_banks));
+ this_cpu_ptr(&mce_poll_banks));
mce_intel_cmci_poll();
}

@@ -1329,7 +1327,7 @@ static void mce_timer_fn(unsigned long data)
*/
void mce_timer_kick(unsigned long interval)
{
- struct timer_list *t = &__get_cpu_var(mce_timer);
+ struct timer_list *t = this_cpu_ptr(&mce_timer);
unsigned long when = jiffies + interval;
unsigned long iv = __this_cpu_read(mce_next_interval);

@@ -1665,7 +1663,7 @@ static void mce_start_timer(unsigned int cpu, struct timer_list *t)

static void __mcheck_cpu_init_timer(void)
{
- struct timer_list *t = &__get_cpu_var(mce_timer);
+ struct timer_list *t = this_cpu_ptr(&mce_timer);
unsigned int cpu = smp_processor_id();

setup_timer(t, mce_timer_fn, cpu);
@@ -1708,8 +1706,8 @@ void mcheck_cpu_init(struct cpuinfo_x86 *c)
__mcheck_cpu_init_generic();
__mcheck_cpu_init_vendor(c);
__mcheck_cpu_init_timer();
- INIT_WORK(&__get_cpu_var(mce_work), mce_process_work);
- init_irq_work(&__get_cpu_var(mce_irq_work), &mce_irq_work_cb);
+ INIT_WORK(this_cpu_ptr(&mce_work), mce_process_work);
+ init_irq_work(this_cpu_ptr(&mce_irq_work), &mce_irq_work_cb);
}

/*
@@ -1961,7 +1959,7 @@ static struct miscdevice mce_chrdev_device = {
static void __mce_disable_bank(void *arg)
{
int bank = *((int *)arg);
- __clear_bit(bank, __get_cpu_var(mce_poll_banks));
+ __clear_bit(bank, *this_cpu_ptr(&mce_poll_banks));
cmci_disable_bank(bank);
}

--
1.9.0


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