diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2011-06-06 12:20:33 +0200 |
|---|---|---|
| committer | Clark Williams <williams@redhat.com> | 2012-02-15 10:32:47 -0600 |
| commit | 2ee05a75c070ce8c1b5577eb8909c762966d278f (patch) | |
| tree | 1564e53b9429edb88410cb0d7ddd2e0db0f6c0ba /include | |
| parent | a2feba07d064c8ea60e0b8904801526c048a0c7c (diff) | |
sched-mmdrop-delayed.patch
Needs thread context (pgd_lock) -> ifdeffed. workqueues wont work with
RT
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/mm_types.h | 4 | ||||
| -rw-r--r-- | include/linux/sched.h | 12 |
2 files changed, 16 insertions, 0 deletions
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 1ec126f23eaa..c303a27981fe 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -12,6 +12,7 @@ #include <linux/completion.h> #include <linux/cpumask.h> #include <linux/page-debug-flags.h> +#include <linux/rcupdate.h> #include <asm/page.h> #include <asm/mmu.h> @@ -393,6 +394,9 @@ struct mm_struct { #ifdef CONFIG_CPUMASK_OFFSTACK struct cpumask cpumask_allocation; #endif +#ifdef CONFIG_PREEMPT_RT_BASE + struct rcu_head delayed_drop; +#endif }; static inline void mm_init_cpumask(struct mm_struct *mm) diff --git a/include/linux/sched.h b/include/linux/sched.h index fb5e51fc5af6..e6f37cacf751 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -2268,12 +2268,24 @@ extern struct mm_struct * mm_alloc(void); /* mmdrop drops the mm and the page tables */ extern void __mmdrop(struct mm_struct *); + static inline void mmdrop(struct mm_struct * mm) { if (unlikely(atomic_dec_and_test(&mm->mm_count))) __mmdrop(mm); } +#ifdef CONFIG_PREEMPT_RT_BASE +extern void __mmdrop_delayed(struct rcu_head *rhp); +static inline void mmdrop_delayed(struct mm_struct *mm) +{ + if (atomic_dec_and_test(&mm->mm_count)) + call_rcu(&mm->delayed_drop, __mmdrop_delayed); +} +#else +# define mmdrop_delayed(mm) mmdrop(mm) +#endif + /* mmput gets rid of the mappings and all user-space */ extern void mmput(struct mm_struct *); /* Grab a reference to a task's mm, if it is not already going away */ |