Merge branch 'akpm' (patches from Andrew)

[sfrench/cifs-2.6.git] / include / linux / sched.h

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 36ec6e7e82917f8ce8e21a48518d8115a7a7f0b3..f073bd59df32c9214f70df5a9a2190bafdd064b8 100644 (file)
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -21,6 +21,7 @@
 #include <linux/seccomp.h>
 #include <linux/nodemask.h>
 #include <linux/rcupdate.h>
+#include <linux/refcount.h>
 #include <linux/resource.h>
 #include <linux/latencytop.h>
 #include <linux/sched/prio.h>
@@ -357,12 +358,6 @@ struct util_est {
  * For cfs_rq, it is the aggregated load_avg of all runnable and
  * blocked sched_entities.
  *
- * load_avg may also take frequency scaling into account:
- *
- *   load_avg = runnable% * scale_load_down(load) * freq%
- *
- * where freq% is the CPU frequency normalized to the highest frequency.
- *
  * [util_avg definition]
  *
  *   util_avg = running% * SCHED_CAPACITY_SCALE
@@ -371,17 +366,14 @@ struct util_est {
  * a CPU. For cfs_rq, it is the aggregated util_avg of all runnable
  * and blocked sched_entities.
  *
- * util_avg may also factor frequency scaling and CPU capacity scaling:
+ * load_avg and util_avg don't direcly factor frequency scaling and CPU
+ * capacity scaling. The scaling is done through the rq_clock_pelt that
+ * is used for computing those signals (see update_rq_clock_pelt())
  *
- *   util_avg = running% * SCHED_CAPACITY_SCALE * freq% * capacity%
- *
- * where freq% is the same as above, and capacity% is the CPU capacity
- * normalized to the greatest capacity (due to uarch differences, etc).
- *
- * N.B., the above ratios (runnable%, running%, freq%, and capacity%)
- * themselves are in the range of [0, 1]. To do fixed point arithmetics,
- * we therefore scale them to as large a range as necessary. This is for
- * example reflected by util_avg's SCHED_CAPACITY_SCALE.
+ * N.B., the above ratios (runnable% and running%) themselves are in the
+ * range of [0, 1]. To do fixed point arithmetics, we therefore scale them
+ * to as large a range as necessary. This is for example reflected by
+ * util_avg's SCHED_CAPACITY_SCALE.
  *
  * [Overflow issue]
  *
@@ -608,7 +600,7 @@ struct task_struct {
        randomized_struct_fields_start
 
        void                            *stack;
-       atomic_t                        usage;
+       refcount_t                      usage;
        /* Per task flags (PF_*), defined further below: */
        unsigned int                    flags;
        unsigned int                    ptrace;
@@ -1191,7 +1183,7 @@ struct task_struct {
 #endif
 #ifdef CONFIG_THREAD_INFO_IN_TASK
        /* A live task holds one reference: */
-       atomic_t                        stack_refcount;
+       refcount_t                      stack_refcount;
 #endif
 #ifdef CONFIG_LIVEPATCH
        int patch_state;
@@ -1408,7 +1400,6 @@ extern struct pid *cad_pid;
 #define PF_NO_SETAFFINITY      0x04000000      /* Userland is not allowed to meddle with cpus_allowed */
 #define PF_MCE_EARLY           0x08000000      /* Early kill for mce process policy */
 #define PF_MEMALLOC_NOCMA      0x10000000      /* All allocation request will have _GFP_MOVABLE cleared */
-#define PF_MUTEX_TESTER                0x20000000      /* Thread belongs to the rt mutex tester */
 #define PF_FREEZER_SKIP                0x40000000      /* Freezer should not count it as freezable */
 #define PF_SUSPEND_TASK                0x80000000      /* This thread called freeze_processes() and should not be frozen */
 
@@ -1458,6 +1449,7 @@ static inline bool is_percpu_thread(void)
 #define PFA_SPEC_SSB_FORCE_DISABLE     4       /* Speculative Store Bypass force disabled*/
 #define PFA_SPEC_IB_DISABLE            5       /* Indirect branch speculation restricted */
 #define PFA_SPEC_IB_FORCE_DISABLE      6       /* Indirect branch speculation permanently restricted */
+#define PFA_SPEC_SSB_NOEXEC            7       /* Speculative Store Bypass clear on execve() */
 
 #define TASK_PFA_TEST(name, func)                                      \
        static inline bool task_##func(struct task_struct *p)           \
@@ -1486,6 +1478,10 @@ TASK_PFA_TEST(SPEC_SSB_DISABLE, spec_ssb_disable)
 TASK_PFA_SET(SPEC_SSB_DISABLE, spec_ssb_disable)
 TASK_PFA_CLEAR(SPEC_SSB_DISABLE, spec_ssb_disable)
 
+TASK_PFA_TEST(SPEC_SSB_NOEXEC, spec_ssb_noexec)
+TASK_PFA_SET(SPEC_SSB_NOEXEC, spec_ssb_noexec)
+TASK_PFA_CLEAR(SPEC_SSB_NOEXEC, spec_ssb_noexec)
+
 TASK_PFA_TEST(SPEC_SSB_FORCE_DISABLE, spec_ssb_force_disable)
 TASK_PFA_SET(SPEC_SSB_FORCE_DISABLE, spec_ssb_force_disable)
 
@@ -1753,9 +1749,9 @@ static __always_inline bool need_resched(void)
 static inline unsigned int task_cpu(const struct task_struct *p)
 {
 #ifdef CONFIG_THREAD_INFO_IN_TASK
-       return p->cpu;
+       return READ_ONCE(p->cpu);
 #else
-       return task_thread_info(p)->cpu;
+       return READ_ONCE(task_thread_info(p)->cpu);
 #endif
 }