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- Remove unnecessary read memory barriers from atomic operations[1].

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- Define a macro to make my intention more clearer.

Submitted by:	jhb [1]
This commit is contained in:
Jung-uk Kim 2009-06-11 16:48:59 +00:00
parent 44672a2966
commit 5d1540edf3
1 changed files with 4 additions and 2 deletions
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6
sys/dev/acpica/Osd/OsdSchedule.c
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@ -72,6 +72,7 @@ struct acpi_task_ctx {
ACPI_OSD_EXEC_CALLBACK at_function;
void *at_context;
int at_flag;
#define ACPI_TASK_FREE 0
#define ACPI_TASK_USED 1
#define ACPI_TASK_ENQUEUED 2
};
@ -111,7 +112,7 @@ acpi_taskq_init(void *arg)
printf("AcpiOsExecute: enqueue %d pending tasks\n",
acpi_task_count);
for (i = 0; i < acpi_max_tasks; i++)
if (atomic_cmpset_acq_int(&acpi_tasks[i].at_flag, ACPI_TASK_USED,
if (atomic_cmpset_int(&acpi_tasks[i].at_flag, ACPI_TASK_USED,
ACPI_TASK_USED | ACPI_TASK_ENQUEUED))
taskqueue_enqueue(acpi_taskq, &acpi_tasks[i].at_task);
}
@ -142,7 +143,8 @@ acpi_task_enqueue(int priority, ACPI_OSD_EXEC_CALLBACK Function, void *Context)
int i;
for (at = NULL, i = 0; i < acpi_max_tasks; i++)
if (atomic_cmpset_acq_int(&acpi_tasks[i].at_flag, 0, ACPI_TASK_USED)) {
if (atomic_cmpset_int(&acpi_tasks[i].at_flag, ACPI_TASK_FREE,
ACPI_TASK_USED)) {
at = &acpi_tasks[i];
acpi_task_count++;
break;