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PM / Sleep: Make the limit of user space wakeup sources configurable

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Make it possible to configure out the check against the limit of
user space wakeup sources for debugging and default Android builds.

Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Arve Hjønnevåg <arve@android.com>
This commit is contained in:
Rafael J. Wysocki 2012-05-05 21:57:20 +02:00
parent 6237dd132d
commit c73893e2ca
2 changed files with 32 additions and 5 deletions
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6
kernel/power/Kconfig
View File

@ -119,6 +119,12 @@ config PM_WAKELOCKS
Allow user space to create, activate and deactivate wakeup source
objects with the help of a sysfs-based interface.
config PM_WAKELOCKS_LIMIT
int "Maximum number of user space wakeup sources (0 = no limit)"
range 0 100000
default 100
depends on PM_WAKELOCKS
config PM_RUNTIME
bool "Run-time PM core functionality"
depends on !IA64_HP_SIM

31
kernel/power/wakelock.c
View File

@ -17,7 +17,6 @@
#include <linux/rbtree.h>
#include <linux/slab.h>
#define WL_NUMBER_LIMIT 100
#define WL_GC_COUNT_MAX 100
#define WL_GC_TIME_SEC 300
@ -32,7 +31,6 @@ struct wakelock {
static struct rb_root wakelocks_tree = RB_ROOT;
static LIST_HEAD(wakelocks_lru_list);
static unsigned int number_of_wakelocks;
static unsigned int wakelocks_gc_count;
ssize_t pm_show_wakelocks(char *buf, bool show_active)
@ -58,6 +56,29 @@ ssize_t pm_show_wakelocks(char *buf, bool show_active)
return (str - buf);
}
#if CONFIG_PM_WAKELOCKS_LIMIT > 0
static unsigned int number_of_wakelocks;
static inline bool wakelocks_limit_exceeded(void)
{
return number_of_wakelocks > CONFIG_PM_WAKELOCKS_LIMIT;
}
static inline void increment_wakelocks_number(void)
{
number_of_wakelocks++;
}
static inline void decrement_wakelocks_number(void)
{
number_of_wakelocks--;
}
#else /* CONFIG_PM_WAKELOCKS_LIMIT = 0 */
static inline bool wakelocks_limit_exceeded(void) { return false; }
static inline void increment_wakelocks_number(void) {}
static inline void decrement_wakelocks_number(void) {}
#endif /* CONFIG_PM_WAKELOCKS_LIMIT */
static struct wakelock *wakelock_lookup_add(const char *name, size_t len,
bool add_if_not_found)
{
@ -85,7 +106,7 @@ static struct wakelock *wakelock_lookup_add(const char *name, size_t len,
if (!add_if_not_found)
return ERR_PTR(-EINVAL);
if (number_of_wakelocks > WL_NUMBER_LIMIT)
if (wakelocks_limit_exceeded())
return ERR_PTR(-ENOSPC);
/* Not found, we have to add a new one. */
@ -103,7 +124,7 @@ static struct wakelock *wakelock_lookup_add(const char *name, size_t len,
rb_link_node(&wl->node, parent, node);
rb_insert_color(&wl->node, &wakelocks_tree);
list_add(&wl->lru, &wakelocks_lru_list);
number_of_wakelocks++;
increment_wakelocks_number();
return wl;
}
@ -175,7 +196,7 @@ static void wakelocks_gc(void)
list_del(&wl->lru);
kfree(wl->name);
kfree(wl);
number_of_wakelocks--;
decrement_wakelocks_number();
}
}
wakelocks_gc_count = 0;