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Message-ID: <20130119003954.GI24579@htj.dyndns.org>
Date: Fri, 18 Jan 2013 16:39:54 -0800
From: Tejun Heo <tj@...nel.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>,
Arjan van de Ven <arjan@...ux.intel.com>,
Dan Williams <djbw@...com>
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] async: bring sanity to the use of words domain and
running
>From eefff28c548fc92cd85dc2b6f22282c9400bce52 Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@...nel.org>
Date: Fri, 18 Jan 2013 16:34:15 -0800
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@...nel.org>
Cc: Arjan van de Ven <arjan@...ux.intel.com>
Cc: Dan Williams <djbw@...com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
---
include/linux/async.h | 6 ++---
kernel/async.c | 68 +++++++++++++++++++++++++--------------------------
2 files changed, 37 insertions(+), 37 deletions(-)
diff --git a/include/linux/async.h b/include/linux/async.h
index 7a24fe9..6f23442 100644
--- a/include/linux/async.h
+++ b/include/linux/async.h
@@ -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 }
diff --git a/kernel/async.c b/kernel/async.c
index 8f9f5cf..c082fed 100644
--- a/kernel/async.c
+++ b/kernel/async.c
@@ -62,7 +62,7 @@ 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);
@@ -73,7 +73,7 @@ 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);
@@ -84,7 +84,7 @@ 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 */
@@ -94,13 +94,13 @@ 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;
}
@@ -109,13 +109,13 @@ 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;
}
@@ -130,11 +130,11 @@ 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);
@@ -160,8 +160,8 @@ 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);
@@ -173,7 +173,7 @@ 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;
@@ -199,13 +199,13 @@ 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);
@@ -225,7 +225,7 @@ 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);
@@ -233,18 +233,18 @@ 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);
@@ -284,7 +284,7 @@ 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);
@@ -293,10 +293,10 @@ 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)
{
@@ -307,17 +307,17 @@ 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) {
@@ -325,7 +325,7 @@ 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();
@@ -347,6 +347,6 @@ 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);
--
1.8.0.2
--
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