linux-kernel - [PATCH] kunit: cleanup assertion macro internal variables

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Date:   Thu, 27 Jan 2022 13:52:22 -0800
From:   Daniel Latypov <dlatypov@...gle.com>
To:     brendanhiggins@...gle.com, davidgow@...gle.com
Cc:     linux-kernel@...r.kernel.org, kunit-dev@...glegroups.com,
        linux-kselftest@...r.kernel.org, skhan@...uxfoundation.org,
        Daniel Latypov <dlatypov@...gle.com>
Subject: [PATCH] kunit: cleanup assertion macro internal variables

All the operands should be tagged `const`.
We're only assigning them to variables so that we can compare them (e.g.
check if left == right, etc.) and avoid evaluating expressions multiple
times.

There's no need for them to be mutable.

Also rename the helper variable `loc` to `__loc` like we do with
`__assertion` and `__strs` to avoid potential name collisions with user
code.

Signed-off-by: Daniel Latypov <dlatypov@...gle.com>
---
Note: this patch is based on top of
https://lore.kernel.org/all/20220125210011.3817742-4-dlatypov@google.com/
There is no semantic dependency between the patches, but they touch
adjacent lines.
---
 include/kunit/test.h | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/include/kunit/test.h b/include/kunit/test.h
index 088ff394ae94..00b9ff7783ab 100644
--- a/include/kunit/test.h
+++ b/include/kunit/test.h
@@ -779,10 +779,10 @@ void kunit_do_failed_assertion(struct kunit *test,
 
 #define KUNIT_ASSERTION(test, assert_type, pass, assert_class, INITIALIZER, fmt, ...) do { \
 	if (unlikely(!(pass))) {					       \
-		static const struct kunit_loc loc = KUNIT_CURRENT_LOC;	       \
+		static const struct kunit_loc __loc = KUNIT_CURRENT_LOC;       \
 		struct assert_class __assertion = INITIALIZER;		       \
 		kunit_do_failed_assertion(test,				       \
-					  &loc,				       \
+					  &__loc,			       \
 					  assert_type,			       \
 					  &__assertion.assert,		       \
 					  fmt,				       \
@@ -872,8 +872,8 @@ void kunit_do_failed_assertion(struct kunit *test,
 				    fmt,				       \
 				    ...)				       \
 do {									       \
-	typeof(left) __left = (left);					       \
-	typeof(right) __right = (right);				       \
+	const typeof(left) __left = (left);				       \
+	const typeof(right) __right = (right);				       \
 	static const struct kunit_binary_assert_text __text = {		       \
 		.operation = #op,					       \
 		.left_text = #left,					       \
@@ -956,7 +956,7 @@ do {									       \
 						fmt,			       \
 						...)			       \
 do {									       \
-	typeof(ptr) __ptr = (ptr);					       \
+	const typeof(ptr) __ptr = (ptr);				       \
 									       \
 	KUNIT_ASSERTION(test,						       \
 			assert_type,					       \
-- 
2.35.0.rc2.247.g8bbb082509-goog