[PATCH 13/25] context_tracking: Introduce context_tracking_enabled_cpu()

[Frederic Weisbecker]

This allows us to check if a remote CPU runs context tracking
(ie: is nohz_full). We'll need that to reliably support "nice"
accounting on kcpustat.

Signed-off-by: Frederic Weisbecker <frede...@kernel.org>
Cc: Yauheni Kaliuta <yauheni.kali...@redhat.com>
Cc: Thomas Gleixner <t...@linutronix.de>
Cc: Rik van Riel <r...@redhat.com>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Wanpeng Li <wanpen...@tencent.com>
Cc: Ingo Molnar <mi...@kernel.org>
---
 include/linux/context_tracking_state.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/linux/context_tracking_state.h 
b/include/linux/context_tracking_state.h
index 08f125f..5877177 100644
--- a/include/linux/context_tracking_state.h
+++ b/include/linux/context_tracking_state.h
@@ -31,6 +31,11 @@ static inline bool context_tracking_enabled(void)
        return static_branch_unlikely(&context_tracking_key);
 }
 
+static inline bool context_tracking_enabled_cpu(int cpu)
+{
+       return per_cpu(context_tracking.active, cpu);
+}
+
 static inline bool context_tracking_enabled_this_cpu(void)
 {
        return __this_cpu_read(context_tracking.active);
@@ -43,6 +48,7 @@ static inline bool context_tracking_in_user(void)
 #else
 static inline bool context_tracking_in_user(void) { return false; }
 static inline bool context_tracking_enabled(void) { return false; }
+static inline bool context_tracking_enabled_cpu(int cpu) { return false; }
 static inline bool context_tracking_enabled_this_cpu(void) { return false; }
 #endif /* CONFIG_CONTEXT_TRACKING */
 
-- 
2.7.4