Merge tag 'sched-for-bpf-2020-02-20' of... (8eece07c) · Commits · 戴 / test

include/linux/kernel.h

+7 −0

Original line number	Diff line number	Diff line
		@@ -257,6 +257,13 @@ extern void __cant_sleep(const char *file, int line, int preempt_offset);

		#define might_sleep_if(cond) do { if (cond) might_sleep(); } while (0)

		#ifndef CONFIG_PREEMPT_RT
		# define cant_migrate() cant_sleep()
		#else
		/* Placeholder for now */
		# define cant_migrate() do { } while (0)
		#endif

		/**
		* abs - return absolute value of an argument
		* @x: the value. If it is unsigned type, it is converted to signed type first.

+30 −0

Original line number	Diff line number	Diff line
		@@ -322,4 +322,34 @@ static inline void preempt_notifier_init(struct preempt_notifier *notifier,

		#endif

		/**
		* migrate_disable - Prevent migration of the current task
		*
		* Maps to preempt_disable() which also disables preemption. Use
		* migrate_disable() to annotate that the intent is to prevent migration,
		* but not necessarily preemption.
		*
		* Can be invoked nested like preempt_disable() and needs the corresponding
		* number of migrate_enable() invocations.
		*/
		static __always_inline void migrate_disable(void)
		{
		preempt_disable();
		}

		/**
		* migrate_enable - Allow migration of the current task
		*
		* Counterpart to migrate_disable().
		*
		* As migrate_disable() can be invoked nested, only the outermost invocation
		* reenables migration.
		*
		* Currently mapped to preempt_enable().
		*/
		static __always_inline void migrate_enable(void)
		{
		preempt_enable();
		}

		#endif /* __LINUX_PREEMPT_H */