[RFC PATCH 05/20] context_tracking: Always inline the empty stubs called from noinstr code

[Sasha Levin <sashal@kernel.org>]

The !CONFIG_CONTEXT_TRACKING_USER versions of user_enter_irqoff() and
user_exit_irqoff(), and the !CONFIG_CONTEXT_TRACKING_IDLE versions of
ct_idle_enter() and ct_idle_exit(), are plain static inline functions,
while their real counterparts are __always_inline (user_*_irqoff()) or
noinstr (ct_idle_*()) functions. They are called from noinstr code, so
when they aren't inlined that's a call leaving the noinstr section. This
happens with code coverage instrumentation, which makes the compiler
refuse to inline an instrumented function into a noinstr one:

  vmlinux.o: warning: objtool: do_syscall_64+0x81: call to user_exit_irqoff() leaves .noinstr.text section

Make the stubs __always_inline as well.

Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 include/linux/context_tracking.h | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/linux/context_tracking.h b/include/linux/context_tracking.h
index af9fe87a09225..d0672916fc1d3 100644
--- a/include/linux/context_tracking.h
+++ b/include/linux/context_tracking.h
@@ -93,8 +93,8 @@ static __always_inline bool context_tracking_guest_exit(void)
 #else
 static inline void user_enter(void) { }
 static inline void user_exit(void) { }
-static inline void user_enter_irqoff(void) { }
-static inline void user_exit_irqoff(void) { }
+static __always_inline void user_enter_irqoff(void) { }
+static __always_inline void user_exit_irqoff(void) { }
 static inline int exception_enter(void) { return 0; }
 static inline void exception_exit(enum ctx_state prev_ctx) { }
 static inline int ct_state(void) { return -1; }
@@ -162,8 +162,8 @@ static __always_inline void warn_rcu_exit(bool rcu)
 }
 
 #else
-static inline void ct_idle_enter(void) { }
-static inline void ct_idle_exit(void) { }
+static __always_inline void ct_idle_enter(void) { }
+static __always_inline void ct_idle_exit(void) { }
 
 static __always_inline bool warn_rcu_enter(void) { return false; }
 static __always_inline void warn_rcu_exit(bool rcu) { }
-- 
2.53.0