[PATCH 5/9 UPDATED] percpu: clean up percpu variable definitions

From: Tejun Heo
Date: Thu Jun 18 2009 - 03:36:50 EST

Percpu variable definition is about to be updated such that no static
declaration is allowed. Update percpu variable definitions
accordingly.

* as,cfq: rename ioc_count uniquely

* cpufreq: rename cpu_dbs_info uniquely

* xen: move nesting_count out of xen_evtchn_do_upcall() and rename it

* mm: move ratelimits out of balance_dirty_pages_ratelimited_nr() and
rename it

* ipv4,6: rename cookie_scratch uniquely

* x86 pref_counter: rename prev_left to pmc_prev_left, irq_entry to
pmc_irq_entry and nmi_entry to pmc_nmi_entry

* perf_counter: rename disable_count to perf_disable_count

* ftrace: rename test_event_disable to ftrace_test_event_disable

* kmemleak: rename test_pointer to kmemleak_test_pointer

[ Impact: percpu usage cleanups, no duplicate static percpu var names ]

Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
Reviewed-by: Christoph Lameter <cl@xxxxxxxxxxxxxxxxxxxx>
Cc: Ivan Kokshaysky <ink@xxxxxxxxxxxxxxxxxxxx>
Cc: Jens Axboe <jens.axboe@xxxxxxxxxx>
Cc: Dave Jones <davej@xxxxxxxxxx>
Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxxxxxxx>
Cc: linux-mm <linux-mm@xxxxxxxxx>
Cc: David S. Miller <davem@xxxxxxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Steven Rostedt <srostedt@xxxxxxxxxx>
Cc: Li Zefan <lizf@xxxxxxxxxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
---
Updates for newly added percpu variables in perf_counter, kmemleak and
ftrace added. Note that these changes were accidentally put in the
next patch in the original posting. The end result remains the same.

arch/x86/kernel/cpu/perf_counter.c | 14 +++++++-------
block/as-iosched.c | 10 +++++-----
block/cfq-iosched.c | 10 +++++-----
drivers/cpufreq/cpufreq_conservative.c | 12 ++++++------
drivers/cpufreq/cpufreq_ondemand.c | 15 ++++++++-------
drivers/xen/events.c | 9 +++++----
kernel/perf_counter.c | 6 +++---
kernel/trace/trace_events.c | 6 +++---
mm/kmemleak-test.c | 6 +++---
mm/page-writeback.c | 5 +++--
net/ipv4/syncookies.c | 5 +++--
net/ipv6/syncookies.c | 5 +++--
12 files changed, 54 insertions(+), 49 deletions(-)

Index: work/block/as-iosched.c
===================================================================
--- work.orig/block/as-iosched.c
+++ work/block/as-iosched.c
@@ -146,7 +146,7 @@ enum arq_state {
#define RQ_STATE(rq) ((enum arq_state)(rq)->elevator_private2)
#define RQ_SET_STATE(rq, state) ((rq)->elevator_private2 = (void *) state)

-static DEFINE_PER_CPU(unsigned long, ioc_count);
+static DEFINE_PER_CPU(unsigned long, as_ioc_count);
static struct completion *ioc_gone;
static DEFINE_SPINLOCK(ioc_gone_lock);

@@ -161,7 +161,7 @@ static void as_antic_stop(struct as_data
static void free_as_io_context(struct as_io_context *aic)
{
kfree(aic);
- elv_ioc_count_dec(ioc_count);
+ elv_ioc_count_dec(as_ioc_count);
if (ioc_gone) {
/*
* AS scheduler is exiting, grab exit lock and check
@@ -169,7 +169,7 @@ static void free_as_io_context(struct as
* complete ioc_gone and set it back to NULL.
*/
spin_lock(&ioc_gone_lock);
- if (ioc_gone && !elv_ioc_count_read(ioc_count)) {
+ if (ioc_gone && !elv_ioc_count_read(as_ioc_count)) {
complete(ioc_gone);
ioc_gone = NULL;
}
@@ -211,7 +211,7 @@ static struct as_io_context *alloc_as_io
ret->seek_total = 0;
ret->seek_samples = 0;
ret->seek_mean = 0;
- elv_ioc_count_inc(ioc_count);
+ elv_ioc_count_inc(as_ioc_count);
}

return ret;
@@ -1507,7 +1507,7 @@ static void __exit as_exit(void)
ioc_gone = &all_gone;
/* ioc_gone's update must be visible before reading ioc_count */
smp_wmb();
- if (elv_ioc_count_read(ioc_count))
+ if (elv_ioc_count_read(as_ioc_count))
wait_for_completion(&all_gone);
synchronize_rcu();
}
Index: work/block/cfq-iosched.c
===================================================================
--- work.orig/block/cfq-iosched.c
+++ work/block/cfq-iosched.c
@@ -48,7 +48,7 @@ static int cfq_slice_idle = HZ / 125;
static struct kmem_cache *cfq_pool;
static struct kmem_cache *cfq_ioc_pool;

-static DEFINE_PER_CPU(unsigned long, ioc_count);
+static DEFINE_PER_CPU(unsigned long, cfq_ioc_count);
static struct completion *ioc_gone;
static DEFINE_SPINLOCK(ioc_gone_lock);

@@ -1422,7 +1422,7 @@ static void cfq_cic_free_rcu(struct rcu_
cic = container_of(head, struct cfq_io_context, rcu_head);

kmem_cache_free(cfq_ioc_pool, cic);
- elv_ioc_count_dec(ioc_count);
+ elv_ioc_count_dec(cfq_ioc_count);

if (ioc_gone) {
/*
@@ -1431,7 +1431,7 @@ static void cfq_cic_free_rcu(struct rcu_
* complete ioc_gone and set it back to NULL
*/
spin_lock(&ioc_gone_lock);
- if (ioc_gone && !elv_ioc_count_read(ioc_count)) {
+ if (ioc_gone && !elv_ioc_count_read(cfq_ioc_count)) {
complete(ioc_gone);
ioc_gone = NULL;
}
@@ -1557,7 +1557,7 @@ cfq_alloc_io_context(struct cfq_data *cf
INIT_HLIST_NODE(&cic->cic_list);
cic->dtor = cfq_free_io_context;
cic->exit = cfq_exit_io_context;
- elv_ioc_count_inc(ioc_count);
+ elv_ioc_count_inc(cfq_ioc_count);
}

return cic;
@@ -2658,7 +2658,7 @@ static void __exit cfq_exit(void)
* this also protects us from entering cfq_slab_kill() with
* pending RCU callbacks
*/
- if (elv_ioc_count_read(ioc_count))
+ if (elv_ioc_count_read(cfq_ioc_count))
wait_for_completion(&all_gone);
cfq_slab_kill();
}
Index: work/drivers/cpufreq/cpufreq_conservative.c
===================================================================
--- work.orig/drivers/cpufreq/cpufreq_conservative.c
+++ work/drivers/cpufreq/cpufreq_conservative.c
@@ -80,7 +80,7 @@ struct cpu_dbs_info_s {
int cpu;
unsigned int enable:1;
};
-static DEFINE_PER_CPU(struct cpu_dbs_info_s, cpu_dbs_info);
+static DEFINE_PER_CPU(struct cpu_dbs_info_s, cs_cpu_dbs_info);

static unsigned int dbs_enable; /* number of CPUs using this policy */

@@ -153,7 +153,7 @@ dbs_cpufreq_notifier(struct notifier_blo
void *data)
{
struct cpufreq_freqs *freq = data;
- struct cpu_dbs_info_s *this_dbs_info = &per_cpu(cpu_dbs_info,
+ struct cpu_dbs_info_s *this_dbs_info = &per_cpu(cs_cpu_dbs_info,
freq->cpu);

struct cpufreq_policy *policy;
@@ -326,7 +326,7 @@ static ssize_t store_ignore_nice_load(st
/* we need to re-evaluate prev_cpu_idle */
for_each_online_cpu(j) {
struct cpu_dbs_info_s *dbs_info;
- dbs_info = &per_cpu(cpu_dbs_info, j);
+ dbs_info = &per_cpu(cs_cpu_dbs_info, j);
dbs_info->prev_cpu_idle = get_cpu_idle_time(j,
&dbs_info->prev_cpu_wall);
if (dbs_tuners_ins.ignore_nice)
@@ -416,7 +416,7 @@ static void dbs_check_cpu(struct cpu_dbs
cputime64_t cur_wall_time, cur_idle_time;
unsigned int idle_time, wall_time;

- j_dbs_info = &per_cpu(cpu_dbs_info, j);
+ j_dbs_info = &per_cpu(cs_cpu_dbs_info, j);

cur_idle_time = get_cpu_idle_time(j, &cur_wall_time);

@@ -556,7 +556,7 @@ static int cpufreq_governor_dbs(struct c
unsigned int j;
int rc;

- this_dbs_info = &per_cpu(cpu_dbs_info, cpu);
+ this_dbs_info = &per_cpu(cs_cpu_dbs_info, cpu);

switch (event) {
case CPUFREQ_GOV_START:
@@ -576,7 +576,7 @@ static int cpufreq_governor_dbs(struct c

for_each_cpu(j, policy->cpus) {
struct cpu_dbs_info_s *j_dbs_info;
- j_dbs_info = &per_cpu(cpu_dbs_info, j);
+ j_dbs_info = &per_cpu(cs_cpu_dbs_info, j);
j_dbs_info->cur_policy = policy;

j_dbs_info->prev_cpu_idle = get_cpu_idle_time(j,
Index: work/drivers/cpufreq/cpufreq_ondemand.c
===================================================================
--- work.orig/drivers/cpufreq/cpufreq_ondemand.c
+++ work/drivers/cpufreq/cpufreq_ondemand.c
@@ -87,7 +87,7 @@ struct cpu_dbs_info_s {
unsigned int enable:1,
sample_type:1;
};
-static DEFINE_PER_CPU(struct cpu_dbs_info_s, cpu_dbs_info);
+static DEFINE_PER_CPU(struct cpu_dbs_info_s, od_cpu_dbs_info);

static unsigned int dbs_enable; /* number of CPUs using this policy */

@@ -165,7 +165,8 @@ static unsigned int powersave_bias_targe
unsigned int freq_hi, freq_lo;
unsigned int index = 0;
unsigned int jiffies_total, jiffies_hi, jiffies_lo;
- struct cpu_dbs_info_s *dbs_info = &per_cpu(cpu_dbs_info, policy->cpu);
+ struct cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info,
+ policy->cpu);

if (!dbs_info->freq_table) {
dbs_info->freq_lo = 0;
@@ -210,7 +211,7 @@ static void ondemand_powersave_bias_init
{
int i;
for_each_online_cpu(i) {
- struct cpu_dbs_info_s *dbs_info = &per_cpu(cpu_dbs_info, i);
+ struct cpu_dbs_info_s *dbs_info = &per_cpu(od_cpu_dbs_info, i);
dbs_info->freq_table = cpufreq_frequency_get_table(i);
dbs_info->freq_lo = 0;
}
@@ -325,7 +326,7 @@ static ssize_t store_ignore_nice_load(st
/* we need to re-evaluate prev_cpu_idle */
for_each_online_cpu(j) {
struct cpu_dbs_info_s *dbs_info;
- dbs_info = &per_cpu(cpu_dbs_info, j);
+ dbs_info = &per_cpu(od_cpu_dbs_info, j);
dbs_info->prev_cpu_idle = get_cpu_idle_time(j,
&dbs_info->prev_cpu_wall);
if (dbs_tuners_ins.ignore_nice)
@@ -419,7 +420,7 @@ static void dbs_check_cpu(struct cpu_dbs
unsigned int load, load_freq;
int freq_avg;

- j_dbs_info = &per_cpu(cpu_dbs_info, j);
+ j_dbs_info = &per_cpu(od_cpu_dbs_info, j);

cur_idle_time = get_cpu_idle_time(j, &cur_wall_time);

@@ -576,7 +577,7 @@ static int cpufreq_governor_dbs(struct c
unsigned int j;
int rc;

- this_dbs_info = &per_cpu(cpu_dbs_info, cpu);
+ this_dbs_info = &per_cpu(od_cpu_dbs_info, cpu);

switch (event) {
case CPUFREQ_GOV_START:
@@ -598,7 +599,7 @@ static int cpufreq_governor_dbs(struct c

for_each_cpu(j, policy->cpus) {
struct cpu_dbs_info_s *j_dbs_info;
- j_dbs_info = &per_cpu(cpu_dbs_info, j);
+ j_dbs_info = &per_cpu(od_cpu_dbs_info, j);
j_dbs_info->cur_policy = policy;

j_dbs_info->prev_cpu_idle = get_cpu_idle_time(j,
Index: work/drivers/xen/events.c
===================================================================
--- work.orig/drivers/xen/events.c
+++ work/drivers/xen/events.c
@@ -602,6 +602,8 @@ irqreturn_t xen_debug_interrupt(int irq,
return IRQ_HANDLED;
}

+static DEFINE_PER_CPU(unsigned, xed_nesting_count);
+
/*
* Search the CPUs pending events bitmasks. For each one found, map
* the event number to an irq, and feed it into do_IRQ() for
@@ -617,7 +619,6 @@ void xen_evtchn_do_upcall(struct pt_regs
struct pt_regs *old_regs = set_irq_regs(regs);
struct shared_info *s = HYPERVISOR_shared_info;
struct vcpu_info *vcpu_info = __get_cpu_var(xen_vcpu);
- static DEFINE_PER_CPU(unsigned, nesting_count);
unsigned count;

exit_idle();
@@ -628,7 +629,7 @@ void xen_evtchn_do_upcall(struct pt_regs

vcpu_info->evtchn_upcall_pending = 0;

- if (__get_cpu_var(nesting_count)++)
+ if (__get_cpu_var(xed_nesting_count)++)
goto out;

#ifndef CONFIG_X86 /* No need for a barrier -- XCHG is a barrier on x86. */
@@ -653,8 +654,8 @@ void xen_evtchn_do_upcall(struct pt_regs

BUG_ON(!irqs_disabled());

- count = __get_cpu_var(nesting_count);
- __get_cpu_var(nesting_count) = 0;
+ count = __get_cpu_var(xed_nesting_count);
+ __get_cpu_var(xed_nesting_count) = 0;
} while(count != 1);

out:
Index: work/mm/page-writeback.c
===================================================================
--- work.orig/mm/page-writeback.c
+++ work/mm/page-writeback.c
@@ -606,6 +606,8 @@ void set_page_dirty_balance(struct page
}
}

+static DEFINE_PER_CPU(unsigned long, bdp_ratelimits) = 0;
+
/**
* balance_dirty_pages_ratelimited_nr - balance dirty memory state
* @mapping: address_space which was dirtied
@@ -623,7 +625,6 @@ void set_page_dirty_balance(struct page
void balance_dirty_pages_ratelimited_nr(struct address_space *mapping,
unsigned long nr_pages_dirtied)
{
- static DEFINE_PER_CPU(unsigned long, ratelimits) = 0;
unsigned long ratelimit;
unsigned long *p;

@@ -636,7 +637,7 @@ void balance_dirty_pages_ratelimited_nr(
* tasks in balance_dirty_pages(). Period.
*/
preempt_disable();
- p = &__get_cpu_var(ratelimits);
+ p = &__get_cpu_var(bdp_ratelimits);
*p += nr_pages_dirtied;
if (unlikely(*p >= ratelimit)) {
*p = 0;
Index: work/net/ipv4/syncookies.c
===================================================================
--- work.orig/net/ipv4/syncookies.c
+++ work/net/ipv4/syncookies.c
@@ -37,12 +37,13 @@ __initcall(init_syncookies);
#define COOKIEBITS 24 /* Upper bits store count */
#define COOKIEMASK (((__u32)1 << COOKIEBITS) - 1)

-static DEFINE_PER_CPU(__u32 [16 + 5 + SHA_WORKSPACE_WORDS], cookie_scratch);
+static DEFINE_PER_CPU(__u32 [16 + 5 + SHA_WORKSPACE_WORDS],
+ ipv4_cookie_scratch);

static u32 cookie_hash(__be32 saddr, __be32 daddr, __be16 sport, __be16 dport,
u32 count, int c)
{
- __u32 *tmp = __get_cpu_var(cookie_scratch);
+ __u32 *tmp = __get_cpu_var(ipv4_cookie_scratch);

memcpy(tmp + 4, syncookie_secret[c], sizeof(syncookie_secret[c]));
tmp[0] = (__force u32)saddr;
Index: work/net/ipv6/syncookies.c
===================================================================
--- work.orig/net/ipv6/syncookies.c
+++ work/net/ipv6/syncookies.c
@@ -74,12 +74,13 @@ static inline struct sock *get_cookie_so
return child;
}

-static DEFINE_PER_CPU(__u32 [16 + 5 + SHA_WORKSPACE_WORDS], cookie_scratch);
+static DEFINE_PER_CPU(__u32 [16 + 5 + SHA_WORKSPACE_WORDS],
+ ipv6_cookie_scratch);

static u32 cookie_hash(struct in6_addr *saddr, struct in6_addr *daddr,
__be16 sport, __be16 dport, u32 count, int c)
{
- __u32 *tmp = __get_cpu_var(cookie_scratch);
+ __u32 *tmp = __get_cpu_var(ipv6_cookie_scratch);

/*
* we have 320 bits of information to hash, copy in the remaining
Index: work/arch/x86/kernel/cpu/perf_counter.c
===================================================================
--- work.orig/arch/x86/kernel/cpu/perf_counter.c
+++ work/arch/x86/kernel/cpu/perf_counter.c
@@ -861,7 +861,7 @@ amd_pmu_disable_counter(struct hw_perf_c
x86_pmu_disable_counter(hwc, idx);
}

-static DEFINE_PER_CPU(u64, prev_left[X86_PMC_IDX_MAX]);
+static DEFINE_PER_CPU(u64, pmc_prev_left[X86_PMC_IDX_MAX]);

/*
* Set the next IRQ period, based on the hwc->period_left value.
@@ -900,7 +900,7 @@ x86_perf_counter_set_period(struct perf_
if (left > x86_pmu.max_period)
left = x86_pmu.max_period;

- per_cpu(prev_left[idx], smp_processor_id()) = left;
+ per_cpu(pmc_prev_left[idx], smp_processor_id()) = left;

/*
* The hw counter starts counting from this counter offset,
@@ -1088,7 +1088,7 @@ void perf_counter_print_debug(void)
rdmsrl(x86_pmu.eventsel + idx, pmc_ctrl);
rdmsrl(x86_pmu.perfctr + idx, pmc_count);

- prev_left = per_cpu(prev_left[idx], cpu);
+ prev_left = per_cpu(pmc_prev_left[idx], cpu);

pr_info("CPU#%d: gen-PMC%d ctrl: %016llx\n",
cpu, idx, pmc_ctrl);
@@ -1560,8 +1560,8 @@ void callchain_store(struct perf_callcha
entry->ip[entry->nr++] = ip;
}

-static DEFINE_PER_CPU(struct perf_callchain_entry, irq_entry);
-static DEFINE_PER_CPU(struct perf_callchain_entry, nmi_entry);
+static DEFINE_PER_CPU(struct perf_callchain_entry, pmc_irq_entry);
+static DEFINE_PER_CPU(struct perf_callchain_entry, pmc_nmi_entry);


static void
@@ -1696,9 +1696,9 @@ struct perf_callchain_entry *perf_callch
struct perf_callchain_entry *entry;

if (in_nmi())
- entry = &__get_cpu_var(nmi_entry);
+ entry = &__get_cpu_var(pmc_nmi_entry);
else
- entry = &__get_cpu_var(irq_entry);
+ entry = &__get_cpu_var(pmc_irq_entry);

entry->nr = 0;
entry->hv = 0;
Index: work/kernel/perf_counter.c
===================================================================
--- work.orig/kernel/perf_counter.c
+++ work/kernel/perf_counter.c
@@ -98,16 +98,16 @@ hw_perf_group_sched_in(struct perf_count

void __weak perf_counter_print_debug(void) { }

-static DEFINE_PER_CPU(int, disable_count);
+static DEFINE_PER_CPU(int, perf_disable_count);

void __perf_disable(void)
{
- __get_cpu_var(disable_count)++;
+ __get_cpu_var(perf_disable_count)++;
}

bool __perf_enable(void)
{
- return !--__get_cpu_var(disable_count);
+ return !--__get_cpu_var(perf_disable_count);
}

void perf_disable(void)
Index: work/kernel/trace/trace_events.c
===================================================================
--- work.orig/kernel/trace/trace_events.c
+++ work/kernel/trace/trace_events.c
@@ -1318,7 +1318,7 @@ static __init void event_trace_self_test

#ifdef CONFIG_FUNCTION_TRACER

-static DEFINE_PER_CPU(atomic_t, test_event_disable);
+static DEFINE_PER_CPU(atomic_t, ftrace_test_event_disable);

static void
function_test_events_call(unsigned long ip, unsigned long parent_ip)
@@ -1334,7 +1334,7 @@ function_test_events_call(unsigned long
pc = preempt_count();
resched = ftrace_preempt_disable();
cpu = raw_smp_processor_id();
- disabled = atomic_inc_return(&per_cpu(test_event_disable, cpu));
+ disabled = atomic_inc_return(&per_cpu(ftrace_test_event_disable, cpu));

if (disabled != 1)
goto out;
@@ -1352,7 +1352,7 @@ function_test_events_call(unsigned long
trace_nowake_buffer_unlock_commit(event, flags, pc);

out:
- atomic_dec(&per_cpu(test_event_disable, cpu));
+ atomic_dec(&per_cpu(ftrace_test_event_disable, cpu));
ftrace_preempt_enable(resched);
}

Index: work/mm/kmemleak-test.c
===================================================================
--- work.orig/mm/kmemleak-test.c
+++ work/mm/kmemleak-test.c
@@ -36,7 +36,7 @@ struct test_node {
};

static LIST_HEAD(test_list);
-static DEFINE_PER_CPU(void *, test_pointer);
+static DEFINE_PER_CPU(void *, kmemleak_test_pointer);

/*
* Some very simple testing. This function needs to be extended for
@@ -86,9 +86,9 @@ static int __init kmemleak_test_init(voi
}

for_each_possible_cpu(i) {
- per_cpu(test_pointer, i) = kmalloc(129, GFP_KERNEL);
+ per_cpu(kmemleak_test_pointer, i) = kmalloc(129, GFP_KERNEL);
pr_info("kmemleak: kmalloc(129) = %p\n",
- per_cpu(test_pointer, i));
+ per_cpu(kmemleak_test_pointer, i));
}

return 0;
--
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