linux-kernel - [PATCH] trace: initcall: Ordered comparison of function pointers

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Date:   Wed, 25 Apr 2018 16:42:35 -0700
From:   Rishabh Bhatnagar <rishabhb@...eaurora.org>
To:     rostedt@...dmis.org, abderrahmane.benbachir@...ymtl.ca
Cc:     linux-kernel@...r.kernel.org, tsoni@...eaurora.org,
        ckadabi@...eaurora.org, Rishabh Bhatnagar <rishabhb@...eaurora.org>
Subject: [PATCH] trace: initcall: Ordered comparison of function pointers

Using initcall_t in the __field macro generates the follwing warning
with clang version 6.0:

include/trace/events/initcall.h:34:3: warning: ordered comparison of
function pointers ('initcall_t' (aka 'int (*)(void)') and 'initcall_t')

__field macro expands to __field_ext macro which does is_signed_type
check on the type argument. Since initcall_t is defined as a function
pointer, using it as the type in the __field macro, leads to an ordered
comparison of function pointer warning, inside the check. Using
__field_struct macro avoids the issue.

Signed-off-by: Rishabh Bhatnagar <rishabhb@...eaurora.org>
---
 include/trace/events/initcall.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/include/trace/events/initcall.h b/include/trace/events/initcall.h
index 8d6cf10..46f5f7c 100644
--- a/include/trace/events/initcall.h
+++ b/include/trace/events/initcall.h
@@ -31,7 +31,7 @@
 	TP_ARGS(func),
 
 	TP_STRUCT__entry(
-		__field(initcall_t, func)
+		__field_struct(initcall_t, func)
 	),
 
 	TP_fast_assign(
@@ -48,7 +48,7 @@
 	TP_ARGS(func, ret),
 
 	TP_STRUCT__entry(
-		__field(initcall_t,	func)
+		__field_struct(initcall_t,	func)
 		__field(int,		ret)
 	),
 
-- 
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