[PATCH 3/7] checkpatch: Undeprecate rcu_read_lock_trace() and rcu_read_unlock_trace()

[Paul E. McKenney]

It turns out that there are BPF use cases that rely on nesting RCU
Tasks Trace readers.  These use cases are well-served by the old
rcu_read_lock_trace() and rcu_read_unlock_trace() functions that maintain
a nesting counter in the task_struct structure.  But these use cases incur
a performance penalty when using the shiny new rcu_read_lock_tasks_trace()
and rcu_read_unlock_tasks_trace() functions, which nest in the same way
that SRCU does.

This means that rcu_read_lock_trace() and rcu_read_unlock_trace()
will be with us for some time.  Therefore, remove the checkpatch.pl
deprecation.

Reported-by: Puranjay Mohan <puranjay@xxxxxxxxxx>
Signed-off-by: Paul E. McKenney <paulmck@xxxxxxxxxx>
Cc: Andy Whitcroft <apw@xxxxxxxxxxxxx>
Cc: Joe Perches <joe@xxxxxxxxxxx>
Cc: Dwaipayan Ray <dwaipayanray1@xxxxxxxxx>
Cc: Lukas Bulwahn <lukas.bulwahn@xxxxxxxxx>
---
 scripts/checkpatch.pl | 2 --
 1 file changed, 2 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 0492d6afc9a1fc..7a0aa139a2424a 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -865,8 +865,6 @@ our %deprecated_apis = (
 	"DEFINE_IDR"				=> "DEFINE_XARRAY",
 	"idr_init"				=> "xa_init",
 	"idr_init_base"				=> "xa_init_flags",
-	"rcu_read_lock_trace"			=> "rcu_read_lock_tasks_trace",
-	"rcu_read_unlock_trace"			=> "rcu_read_unlock_tasks_trace",
 );
 
 #Create a search pattern for all these strings to speed up a loop below
-- 
2.40.1