1 files changed, 13 insertions, 115 deletions

diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 90e5790c318f..3b7d05e7169c 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -20,6 +20,7 @@
 #include <linux/seqlock.h>
 #include <linux/percpu_counter.h>
 #include <linux/types.h>
+#include <linux/rseq_types.h>
 #include <linux/bitmap.h>
 
 #include <asm/mmu.h>
@@ -922,14 +923,6 @@ struct vm_area_struct {
 #define vma_policy(vma) NULL
 #endif
 
-#ifdef CONFIG_SCHED_MM_CID
-struct mm_cid {
-	u64 time;
-	int cid;
-	int recent_cid;
-};
-#endif
-
 /*
  * Opaque type representing current mm_struct flag state. Must be accessed via
  * mm_flags_xxx() helper functions.
@@ -991,44 +984,9 @@ struct mm_struct {
 		 */
 		atomic_t mm_users;
 
-#ifdef CONFIG_SCHED_MM_CID
-		/**
-		 * @pcpu_cid: Per-cpu current cid.
-		 *
-		 * Keep track of the currently allocated mm_cid for each cpu.
-		 * The per-cpu mm_cid values are serialized by their respective
-		 * runqueue locks.
-		 */
-		struct mm_cid __percpu *pcpu_cid;
-		/*
-		 * @mm_cid_next_scan: Next mm_cid scan (in jiffies).
-		 *
-		 * When the next mm_cid scan is due (in jiffies).
-		 */
-		unsigned long mm_cid_next_scan;
-		/**
-		 * @nr_cpus_allowed: Number of CPUs allowed for mm.
-		 *
-		 * Number of CPUs allowed in the union of all mm's
-		 * threads allowed CPUs.
-		 */
-		unsigned int nr_cpus_allowed;
-		/**
-		 * @max_nr_cid: Maximum number of allowed concurrency
-		 *              IDs allocated.
-		 *
-		 * Track the highest number of allowed concurrency IDs
-		 * allocated for the mm.
-		 */
-		atomic_t max_nr_cid;
-		/**
-		 * @cpus_allowed_lock: Lock protecting mm cpus_allowed.
-		 *
-		 * Provide mutual exclusion for mm cpus_allowed and
-		 * mm nr_cpus_allowed updates.
-		 */
-		raw_spinlock_t cpus_allowed_lock;
-#endif
+		/* MM CID related storage */
+		struct mm_mm_cid mm_cid;
+
 #ifdef CONFIG_MMU
 		atomic_long_t pgtables_bytes;	/* size of all page tables */
 #endif
@@ -1370,37 +1328,6 @@ static inline void vma_iter_init(struct vma_iterator *vmi,
 }
 
 #ifdef CONFIG_SCHED_MM_CID
-
-enum mm_cid_state {
-	MM_CID_UNSET = -1U,		/* Unset state has lazy_put flag set. */
-	MM_CID_LAZY_PUT = (1U << 31),
-};
-
-static inline bool mm_cid_is_unset(int cid)
-{
-	return cid == MM_CID_UNSET;
-}
-
-static inline bool mm_cid_is_lazy_put(int cid)
-{
-	return !mm_cid_is_unset(cid) && (cid & MM_CID_LAZY_PUT);
-}
-
-static inline bool mm_cid_is_valid(int cid)
-{
-	return !(cid & MM_CID_LAZY_PUT);
-}
-
-static inline int mm_cid_set_lazy_put(int cid)
-{
-	return cid | MM_CID_LAZY_PUT;
-}
-
-static inline int mm_cid_clear_lazy_put(int cid)
-{
-	return cid & ~MM_CID_LAZY_PUT;
-}
-
 /*
  * mm_cpus_allowed: Union of all mm's threads allowed CPUs.
  */
@@ -1415,37 +1342,21 @@ static inline cpumask_t *mm_cpus_allowed(struct mm_struct *mm)
 }
 
 /* Accessor for struct mm_struct's cidmask. */
-static inline cpumask_t *mm_cidmask(struct mm_struct *mm)
+static inline unsigned long *mm_cidmask(struct mm_struct *mm)
 {
 	unsigned long cid_bitmap = (unsigned long)mm_cpus_allowed(mm);
 
 	/* Skip mm_cpus_allowed */
 	cid_bitmap += cpumask_size();
-	return (struct cpumask *)cid_bitmap;
+	return (unsigned long *)cid_bitmap;
 }
 
-static inline void mm_init_cid(struct mm_struct *mm, struct task_struct *p)
-{
-	int i;
-
-	for_each_possible_cpu(i) {
-		struct mm_cid *pcpu_cid = per_cpu_ptr(mm->pcpu_cid, i);
-
-		pcpu_cid->cid = MM_CID_UNSET;
-		pcpu_cid->recent_cid = MM_CID_UNSET;
-		pcpu_cid->time = 0;
-	}
-	mm->nr_cpus_allowed = p->nr_cpus_allowed;
-	atomic_set(&mm->max_nr_cid, 0);
-	raw_spin_lock_init(&mm->cpus_allowed_lock);
-	cpumask_copy(mm_cpus_allowed(mm), &p->cpus_mask);
-	cpumask_clear(mm_cidmask(mm));
-}
+void mm_init_cid(struct mm_struct *mm, struct task_struct *p);
 
 static inline int mm_alloc_cid_noprof(struct mm_struct *mm, struct task_struct *p)
 {
-	mm->pcpu_cid = alloc_percpu_noprof(struct mm_cid);
-	if (!mm->pcpu_cid)
+	mm->mm_cid.pcpu = alloc_percpu_noprof(struct mm_cid_pcpu);
+	if (!mm->mm_cid.pcpu)
 		return -ENOMEM;
 	mm_init_cid(mm, p);
 	return 0;
@@ -1454,37 +1365,24 @@ static inline int mm_alloc_cid_noprof(struct mm_struct *mm, struct task_struct *
 
 static inline void mm_destroy_cid(struct mm_struct *mm)
 {
-	free_percpu(mm->pcpu_cid);
-	mm->pcpu_cid = NULL;
+	free_percpu(mm->mm_cid.pcpu);
+	mm->mm_cid.pcpu = NULL;
 }
 
 static inline unsigned int mm_cid_size(void)
 {
-	return 2 * cpumask_size();	/* mm_cpus_allowed(), mm_cidmask(). */
+	/* mm_cpus_allowed(), mm_cidmask(). */
+	return cpumask_size() + bitmap_size(num_possible_cpus());
 }
 
-static inline void mm_set_cpus_allowed(struct mm_struct *mm, const struct cpumask *cpumask)
-{
-	struct cpumask *mm_allowed = mm_cpus_allowed(mm);
-
-	if (!mm)
-		return;
-	/* The mm_cpus_allowed is the union of each thread allowed CPUs masks. */
-	raw_spin_lock(&mm->cpus_allowed_lock);
-	cpumask_or(mm_allowed, mm_allowed, cpumask);
-	WRITE_ONCE(mm->nr_cpus_allowed, cpumask_weight(mm_allowed));
-	raw_spin_unlock(&mm->cpus_allowed_lock);
-}
 #else /* CONFIG_SCHED_MM_CID */
 static inline void mm_init_cid(struct mm_struct *mm, struct task_struct *p) { }
 static inline int mm_alloc_cid(struct mm_struct *mm, struct task_struct *p) { return 0; }
 static inline void mm_destroy_cid(struct mm_struct *mm) { }
-
 static inline unsigned int mm_cid_size(void)
 {
 	return 0;
 }
-static inline void mm_set_cpus_allowed(struct mm_struct *mm, const struct cpumask *cpumask) { }
 #endif /* CONFIG_SCHED_MM_CID */
 
 struct mmu_gather;