kobject: delay kobject release for random time (89c86a64) · Commits · 戴 / test

When CONFIG_DEBUG_KOBJECT_RELEASE=y, delay kobject release functions for a random time between 1 and 8 seconds, which effectively changes the order in which they're called. Signed-off-by:

Bjorn Helgaas <bhelgaas@google.com> Signed-off-by:

Greg Kroah-Hartman <gregkh@linuxfoundation.org>

lib/kobject.c

+6 −3

Original line number	Diff line number	Diff line
		@@ -18,6 +18,7 @@
		#include <linux/export.h>
		#include <linux/stat.h>
		#include <linux/slab.h>
		#include <linux/random.h>

		/**
		* kobject_namespace - return @kobj's namespace tag
		@@ -642,10 +643,12 @@ static void kobject_release(struct kref *kref)
		{
		struct kobject *kobj = container_of(kref, struct kobject, kref);
		#ifdef CONFIG_DEBUG_KOBJECT_RELEASE
		pr_info("kobject: '%s' (%p): %s, parent %p (delayed)\n",
		kobject_name(kobj), kobj, __func__, kobj->parent);
		unsigned long delay = HZ + HZ * (get_random_int() & 0x3);
		pr_info("kobject: '%s' (%p): %s, parent %p (delayed %ld)\n",
		kobject_name(kobj), kobj, __func__, kobj->parent, delay);
		INIT_DELAYED_WORK(&kobj->release, kobject_delayed_cleanup);
		schedule_delayed_work(&kobj->release, HZ);

		schedule_delayed_work(&kobj->release, delay);
		#else
		kobject_cleanup(kobj);
		#endif

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