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async: bring sanity to the use of words domain and running 

In the beginning, running lists were literal struct list_heads.  Later
on, struct async_domain was added.  For some reason, while the
conversion substituted list_heads with async_domains, the variable
names weren't fully converted.  In more places, "running" was used for
struct async_domain while other places adopted new "domain" name.

The situation is made much worse by having async_domain's running list
named "domain" and async_entry's field pointing to async_domain named
"running".

So, we end up with mix of "running" and "domain" for variable names
for async_domain, with the field names of async_domain and async_entry
swapped between "running" and "domain".

It feels almost intentionally made to be as confusing as possible.
Bring some sanity by

* Renaming all async_domain variables "domain".

* s/async_running/async_dfl_domain/

* s/async_domain->domain/async_domain->running/

* s/async_entry->running/async_entry->domain/

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Dan Williams <djbw@fb.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Tejun Heo 2013-01-23 09:32:30 -08:00
parent c14afb82ff
commit 8723d5037c
2 changed files with 37 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
include/linux/async.h
View File

@ -19,7 +19,7 @@ typedef u64 async_cookie_t;
typedef void (async_func_ptr) (void *data, async_cookie_t cookie);
struct async_domain {
struct list_head node;
struct list_head domain;
struct list_head running;
int count;
unsigned registered:1;
};
@ -29,7 +29,7 @@ struct async_domain {
*/
#define ASYNC_DOMAIN(_name) \
struct async_domain _name = { .node = LIST_HEAD_INIT(_name.node), \
.domain = LIST_HEAD_INIT(_name.domain), \
.running = LIST_HEAD_INIT(_name.running), \
.count = 0, \
.registered = 1 }
@ -39,7 +39,7 @@ struct async_domain {
*/
#define ASYNC_DOMAIN_EXCLUSIVE(_name) \
struct async_domain _name = { .node = LIST_HEAD_INIT(_name.node), \
.domain = LIST_HEAD_INIT(_name.domain), \
.running = LIST_HEAD_INIT(_name.running), \
.count = 0, \
.registered = 0 }

68
kernel/async.c
View File

@ -64,7 +64,7 @@ static async_cookie_t next_cookie = 1;
#define MAX_WORK 32768
static LIST_HEAD(async_pending);
static ASYNC_DOMAIN(async_running);
static ASYNC_DOMAIN(async_dfl_domain);
static LIST_HEAD(async_domains);
static DEFINE_SPINLOCK(async_lock);
static DEFINE_MUTEX(async_register_mutex);
@ -75,7 +75,7 @@ struct async_entry {
async_cookie_t cookie;
async_func_ptr *func;
void *data;
struct async_domain *running;
struct async_domain *domain;
};
static DECLARE_WAIT_QUEUE_HEAD(async_done);
@ -86,7 +86,7 @@ static atomic_t entry_count;
/*
* MUST be called with the lock held!
*/
static async_cookie_t __lowest_in_progress(struct async_domain *running)
static async_cookie_t __lowest_in_progress(struct async_domain *domain)
{
async_cookie_t first_running = next_cookie; /* infinity value */
async_cookie_t first_pending = next_cookie; /* ditto */
@ -96,13 +96,13 @@ static async_cookie_t __lowest_in_progress(struct async_domain *running)
* Both running and pending lists are sorted but not disjoint.
* Take the first cookies from both and return the min.
*/
if (!list_empty(&running->domain)) {
entry = list_first_entry(&running->domain, typeof(*entry), list);
if (!list_empty(&domain->running)) {
entry = list_first_entry(&domain->running, typeof(*entry), list);
first_running = entry->cookie;
}
list_for_each_entry(entry, &async_pending, list) {
if (entry->running == running) {
if (entry->domain == domain) {
first_pending = entry->cookie;
break;
}
@ -111,13 +111,13 @@ static async_cookie_t __lowest_in_progress(struct async_domain *running)
return min(first_running, first_pending);
}
static async_cookie_t lowest_in_progress(struct async_domain *running)
static async_cookie_t lowest_in_progress(struct async_domain *domain)
{
unsigned long flags;
async_cookie_t ret;
spin_lock_irqsave(&async_lock, flags);
ret = __lowest_in_progress(running);
ret = __lowest_in_progress(domain);
spin_unlock_irqrestore(&async_lock, flags);
return ret;
}
@ -132,11 +132,11 @@ static void async_run_entry_fn(struct work_struct *work)
struct async_entry *pos;
unsigned long flags;
ktime_t uninitialized_var(calltime), delta, rettime;
struct async_domain *running = entry->running;
struct async_domain *domain = entry->domain;
/* 1) move self to the running queue, make sure it stays sorted */
spin_lock_irqsave(&async_lock, flags);
list_for_each_entry_reverse(pos, &running->domain, list)
list_for_each_entry_reverse(pos, &domain->running, list)
if (entry->cookie < pos->cookie)
break;
list_move_tail(&entry->list, &pos->list);
@ -162,8 +162,8 @@ static void async_run_entry_fn(struct work_struct *work)
/* 3) remove self from the running queue */
spin_lock_irqsave(&async_lock, flags);
list_del(&entry->list);
if (running->registered && --running->count == 0)
list_del_init(&running->node);
if (domain->registered && --domain->count == 0)
list_del_init(&domain->node);
/* 4) free the entry */
kfree(entry);
@ -175,7 +175,7 @@ static void async_run_entry_fn(struct work_struct *work)
wake_up(&async_done);
}
static async_cookie_t __async_schedule(async_func_ptr *ptr, void *data, struct async_domain *running)
static async_cookie_t __async_schedule(async_func_ptr *ptr, void *data, struct async_domain *domain)
{
struct async_entry *entry;
unsigned long flags;
@ -201,13 +201,13 @@ static async_cookie_t __async_schedule(async_func_ptr *ptr, void *data, struct a
INIT_WORK(&entry->work, async_run_entry_fn);
entry->func = ptr;
entry->data = data;
entry->running = running;
entry->domain = domain;
spin_lock_irqsave(&async_lock, flags);
newcookie = entry->cookie = next_cookie++;
list_add_tail(&entry->list, &async_pending);
if (running->registered && running->count++ == 0)
list_add_tail(&running->node, &async_domains);
if (domain->registered && domain->count++ == 0)
list_add_tail(&domain->node, &async_domains);
atomic_inc(&entry_count);
spin_unlock_irqrestore(&async_lock, flags);
@ -230,7 +230,7 @@ static async_cookie_t __async_schedule(async_func_ptr *ptr, void *data, struct a
*/
async_cookie_t async_schedule(async_func_ptr *ptr, void *data)
{
return __async_schedule(ptr, data, &async_running);
return __async_schedule(ptr, data, &async_dfl_domain);
}
EXPORT_SYMBOL_GPL(async_schedule);
@ -238,18 +238,18 @@ EXPORT_SYMBOL_GPL(async_schedule);
* async_schedule_domain - schedule a function for asynchronous execution within a certain domain
* @ptr: function to execute asynchronously
* @data: data pointer to pass to the function
* @running: running list for the domain
* @domain: the domain
*
* Returns an async_cookie_t that may be used for checkpointing later.
* @running may be used in the async_synchronize_*_domain() functions
* to wait within a certain synchronization domain rather than globally.
* A synchronization domain is specified via the running queue @running to use.
* Note: This function may be called from atomic or non-atomic contexts.
* @domain may be used in the async_synchronize_*_domain() functions to
* wait within a certain synchronization domain rather than globally. A
* synchronization domain is specified via @domain. Note: This function
* may be called from atomic or non-atomic contexts.
*/
async_cookie_t async_schedule_domain(async_func_ptr *ptr, void *data,
struct async_domain *running)
struct async_domain *domain)
{
return __async_schedule(ptr, data, running);
return __async_schedule(ptr, data, domain);
}
EXPORT_SYMBOL_GPL(async_schedule_domain);
@ -289,7 +289,7 @@ void async_unregister_domain(struct async_domain *domain)
mutex_lock(&async_register_mutex);
spin_lock_irq(&async_lock);
WARN_ON(!domain->registered || !list_empty(&domain->node) ||
!list_empty(&domain->domain));
!list_empty(&domain->running));
domain->registered = 0;
spin_unlock_irq(&async_lock);
mutex_unlock(&async_register_mutex);
@ -298,10 +298,10 @@ EXPORT_SYMBOL_GPL(async_unregister_domain);
/**
* async_synchronize_full_domain - synchronize all asynchronous function within a certain domain
* @domain: running list to synchronize on
* @domain: the domain to synchronize
*
* This function waits until all asynchronous function calls for the
* synchronization domain specified by the running list @domain have been done.
* synchronization domain specified by @domain have been done.
*/
void async_synchronize_full_domain(struct async_domain *domain)
{
@ -312,17 +312,17 @@ EXPORT_SYMBOL_GPL(async_synchronize_full_domain);
/**
* async_synchronize_cookie_domain - synchronize asynchronous function calls within a certain domain with cookie checkpointing
* @cookie: async_cookie_t to use as checkpoint
* @running: running list to synchronize on
* @domain: the domain to synchronize
*
* This function waits until all asynchronous function calls for the
* synchronization domain specified by running list @running submitted
* prior to @cookie have been done.
* synchronization domain specified by @domain submitted prior to @cookie
* have been done.
*/
void async_synchronize_cookie_domain(async_cookie_t cookie, struct async_domain *running)
void async_synchronize_cookie_domain(async_cookie_t cookie, struct async_domain *domain)
{
ktime_t uninitialized_var(starttime), delta, endtime;
if (!running)
if (!domain)
return;
if (initcall_debug && system_state == SYSTEM_BOOTING) {
@ -330,7 +330,7 @@ void async_synchronize_cookie_domain(async_cookie_t cookie, struct async_domain
starttime = ktime_get();
}
wait_event(async_done, lowest_in_progress(running) >= cookie);
wait_event(async_done, lowest_in_progress(domain) >= cookie);
if (initcall_debug && system_state == SYSTEM_BOOTING) {
endtime = ktime_get();
@ -352,7 +352,7 @@ EXPORT_SYMBOL_GPL(async_synchronize_cookie_domain);
*/
void async_synchronize_cookie(async_cookie_t cookie)
{
async_synchronize_cookie_domain(cookie, &async_running);
async_synchronize_cookie_domain(cookie, &async_dfl_domain);
}
EXPORT_SYMBOL_GPL(async_synchronize_cookie);