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Two scheduler fixes: 

- A trivial build fix for sched_feat() to compile correctly with
     CONFIG_JUMP_LABEL=n
 
   - Replace a zero lenght array with a flexible array.
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Merge tag 'sched-urgent-2020-10-25' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull scheduler fixes from Thomas Gleixner:
 "Two scheduler fixes:

   - A trivial build fix for sched_feat() to compile correctly with
     CONFIG_JUMP_LABEL=n

   - Replace a zero lenght array with a flexible array"

* tag 'sched-urgent-2020-10-25' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/features: Fix !CONFIG_JUMP_LABEL case
  sched: Replace zero-length array with flexible-array
This commit is contained in:
Linus Torvalds 2020-10-25 11:25:16 -07:00
parent a3d1b31213 a73f863af4
commit 87702a337f
2 changed files with 12 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
kernel/sched/core.c
View File

@ -44,7 +44,7 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(sched_update_nr_running_tp);
DEFINE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues);
#if defined(CONFIG_SCHED_DEBUG) && defined(CONFIG_JUMP_LABEL)
#ifdef CONFIG_SCHED_DEBUG
/*
* Debugging: various feature bits
*

15
kernel/sched/sched.h
View File

@ -1471,7 +1471,7 @@ struct sched_group_capacity {
int id;
#endif
unsigned long cpumask[0]; /* Balance mask */
unsigned long cpumask[]; /* Balance mask */
};
struct sched_group {
@ -1629,7 +1629,7 @@ enum {
#undef SCHED_FEAT
#if defined(CONFIG_SCHED_DEBUG) && defined(CONFIG_JUMP_LABEL)
#ifdef CONFIG_SCHED_DEBUG
/*
* To support run-time toggling of sched features, all the translation units
@ -1637,6 +1637,7 @@ enum {
*/
extern const_debug unsigned int sysctl_sched_features;
#ifdef CONFIG_JUMP_LABEL
#define SCHED_FEAT(name, enabled) \
static __always_inline bool static_branch_##name(struct static_key *key) \
{ \
@ -1649,7 +1650,13 @@ static __always_inline bool static_branch_##name(struct static_key *key) \
extern struct static_key sched_feat_keys[__SCHED_FEAT_NR];
#define sched_feat(x) (static_branch_##x(&sched_feat_keys[__SCHED_FEAT_##x]))
#else /* !(SCHED_DEBUG && CONFIG_JUMP_LABEL) */
#else /* !CONFIG_JUMP_LABEL */
#define sched_feat(x) (sysctl_sched_features & (1UL << __SCHED_FEAT_##x))
#endif /* CONFIG_JUMP_LABEL */
#else /* !SCHED_DEBUG */
/*
* Each translation unit has its own copy of sysctl_sched_features to allow
@ -1665,7 +1672,7 @@ static const_debug __maybe_unused unsigned int sysctl_sched_features =
#define sched_feat(x) !!(sysctl_sched_features & (1UL << __SCHED_FEAT_##x))
#endif /* SCHED_DEBUG && CONFIG_JUMP_LABEL */
#endif /* SCHED_DEBUG */
extern struct static_key_false sched_numa_balancing;
extern struct static_key_false sched_schedstats;