sched: properly define the sched_group::cpumask and sched_domain::span fields (4200efd9) · Commits · 戴 / test

include/linux/sched.h

+22 −3

Original line number	Diff line number	Diff line
		@@ -839,7 +839,17 @@ struct sched_group {
		*/
		u32 reciprocal_cpu_power;

		unsigned long cpumask[];
		/*
		* The CPUs this group covers.
		*
		* NOTE: this field is variable length. (Allocated dynamically
		* by attaching extra space to the end of the structure,
		* depending on how many CPUs the kernel has booted up with)
		*
		* It is also be embedded into static data structures at build
		* time. (See 'struct static_sched_group' in kernel/sched.c)
		*/
		unsigned long cpumask[0];
		};

		static inline struct cpumask sched_group_cpus(struct sched_group sg)
		@@ -925,8 +935,17 @@ struct sched_domain {
		char *name;
		#endif

		/* span of all CPUs in this domain */
		unsigned long span[];
		/*
		* Span of all CPUs in this domain.
		*
		* NOTE: this field is variable length. (Allocated dynamically
		* by attaching extra space to the end of the structure,
		* depending on how many CPUs the kernel has booted up with)
		*
		* It is also be embedded into static data structures at build
		* time. (See 'struct static_sched_domain' in kernel/sched.c)
		*/
		unsigned long span[0];
		};

		static inline struct cpumask sched_domain_span(struct sched_domain sd)

+3 −2

Original line number	Diff line number	Diff line
		@@ -7948,8 +7948,9 @@ int sched_smt_power_savings = 0, sched_mc_power_savings = 0;

		/*
		* The cpus mask in sched_group and sched_domain hangs off the end.
		* FIXME: use cpumask_var_t or dynamic percpu alloc to avoid wasting space
		* for nr_cpu_ids < CONFIG_NR_CPUS.
		*
		* ( See the the comments in include/linux/sched.h:struct sched_group
		* and struct sched_domain. )
		*/
		struct static_sched_group {
		struct sched_group sg;