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SubjectRe: [PATCH] remove CONFIG_ANDROID
Hi Kalesh,

On Wed, Jun 29, 2022 at 03:26:33PM -0700, Kalesh Singh wrote:
> Thanks for taking a look. I'm concerned holding the sys/power/state
> open would have unintentional side effects. Adding the
> /sys/power/userspace_autosuspender seems more appropriate. We don't
> have a use case for the refcounting, so would prefer the simpler
> writing '0' / '1' to toggle semantics.

Alright. So I've cooked you up some code that you can submit, since I
assume based on Christoph's bristliness that he won't do so. The below
adds /sys/power/pm_userspace_autosleeper, which you can write a 0 or a 1
into, and fixes up wireguard and random.c to use it. The code is
untested, but should generally be the correct thing, I think.

So in order of operations:

1. You write a patch for SystemSuspend.cpp and post it on Gerrit.

2. You take the diff below, clean it up or bikeshed the naming a bit or
do whatever there, and submit it to Rafael's PM tree, including as a
`Link: ...` this thread and the Gerrit link.

3. When/if Rafael accepts the patch, you submit the Gerrit CL.

4. When both have landed, Christoph moves forward with his
CONFIG_ANDROID removal.

Does that seem like a reasonable way forward?

Jason

diff --git a/drivers/char/random.c b/drivers/char/random.c
index e3dd1dd3dd22..c25e3be10d9c 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -756,7 +756,7 @@ static int random_pm_notification(struct notifier_block *nb, unsigned long actio

if (crng_ready() && (action == PM_RESTORE_PREPARE ||
(action == PM_POST_SUSPEND &&
- !IS_ENABLED(CONFIG_PM_AUTOSLEEP) && !IS_ENABLED(CONFIG_ANDROID)))) {
+ !IS_ENABLED(CONFIG_PM_AUTOSLEEP) && !pm_userspace_autosleeper_enabled))) {
crng_reseed();
pr_notice("crng reseeded on system resumption\n");
}
diff --git a/drivers/net/wireguard/device.c b/drivers/net/wireguard/device.c
index aa9a7a5970fd..1983e0fadb6e 100644
--- a/drivers/net/wireguard/device.c
+++ b/drivers/net/wireguard/device.c
@@ -69,7 +69,7 @@ static int wg_pm_notification(struct notifier_block *nb, unsigned long action, v
* its normal operation rather than as a somewhat rare event, then we
* don't actually want to clear keys.
*/
- if (IS_ENABLED(CONFIG_PM_AUTOSLEEP) || IS_ENABLED(CONFIG_ANDROID))
+ if (IS_ENABLED(CONFIG_PM_AUTOSLEEP) || pm_userspace_autosleeper_enabled)
return 0;

if (action != PM_HIBERNATION_PREPARE && action != PM_SUSPEND_PREPARE)
diff --git a/include/linux/suspend.h b/include/linux/suspend.h
index 70f2921e2e70..0acff26f87b4 100644
--- a/include/linux/suspend.h
+++ b/include/linux/suspend.h
@@ -498,6 +498,7 @@ extern void ksys_sync_helper(void);
/* drivers/base/power/wakeup.c */
extern bool events_check_enabled;
extern suspend_state_t pm_suspend_target_state;
+extern bool pm_userspace_autosleeper_enabled;

extern bool pm_wakeup_pending(void);
extern void pm_system_wakeup(void);
@@ -537,6 +538,8 @@ static inline void pm_system_irq_wakeup(unsigned int irq_number) {}
static inline void lock_system_sleep(void) {}
static inline void unlock_system_sleep(void) {}

+#define pm_userspace_autosleeper_enabled (false)
+
#endif /* !CONFIG_PM_SLEEP */

#ifdef CONFIG_PM_SLEEP_DEBUG
diff --git a/kernel/power/main.c b/kernel/power/main.c
index e3694034b753..08f32a281010 100644
--- a/kernel/power/main.c
+++ b/kernel/power/main.c
@@ -120,6 +120,23 @@ static ssize_t pm_async_store(struct kobject *kobj, struct kobj_attribute *attr,

power_attr(pm_async);

+bool pm_userspace_autosleeper_enabled;
+
+static ssize_t pm_userspace_autosleeper_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ return sprintf(buf, "%d\n", pm_userspace_autosleeper_enabled);
+}
+
+static ssize_t pm_userspace_autosleeper_store(struct kobject *kobj,
+ struct kobj_attribute *attr,
+ const char *buf, size_t n)
+{
+ return kstrtobool(buf, &pm_userspace_autosleeper_enabled);
+}
+
+power_attr(pm_userspace_autosleeper);
+
#ifdef CONFIG_SUSPEND
static ssize_t mem_sleep_show(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
@@ -869,6 +886,7 @@ static struct attribute * g[] = {
#ifdef CONFIG_PM_SLEEP
&pm_async_attr.attr,
&wakeup_count_attr.attr,
+ &pm_userspace_autosleeper.attr,
#ifdef CONFIG_SUSPEND
&mem_sleep_attr.attr,
&sync_on_suspend_attr.attr,
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