linux-kernel - [PATCH v2.1 02/11] static_call: Flip key type union bit

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Message-ID: <20230322050306.zizbrqc2hwl5s4tj@treble>
Date:   Tue, 21 Mar 2023 22:03:06 -0700
From:   Josh Poimboeuf <jpoimboe@...nel.org>
To:     x86@...nel.org
Cc:     linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Mark Rutland <mark.rutland@....com>,
        Jason Baron <jbaron@...mai.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Will McVicker <willmcvicker@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v2.1 02/11] static_call: Flip key type union bit

Flip the meaning of the key->type union field.  This will make it easier
to converge some of the DECLARE_STATIC_CALL() macros.

Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
---
 include/linux/static_call.h             | 3 ---
 include/linux/static_call_types.h       | 4 ++--
 kernel/static_call_inline.c             | 8 ++++----
 tools/include/linux/static_call_types.h | 4 ++--
 4 files changed, 8 insertions(+), 11 deletions(-)

diff --git a/include/linux/static_call.h b/include/linux/static_call.h
index 141e6b176a1b..f984b8f6d974 100644
--- a/include/linux/static_call.h
+++ b/include/linux/static_call.h
@@ -186,7 +186,6 @@ extern long __static_call_return0(void);
 	DECLARE_STATIC_CALL(name, _func);				\
 	struct static_call_key STATIC_CALL_KEY(name) = {		\
 		.func = _func,						\
-		.type = 1,						\
 	};								\
 	ARCH_DEFINE_STATIC_CALL_TRAMP(name, _func)
 
@@ -194,7 +193,6 @@ extern long __static_call_return0(void);
 	DECLARE_STATIC_CALL(name, _func);				\
 	struct static_call_key STATIC_CALL_KEY(name) = {		\
 		.func = NULL,						\
-		.type = 1,						\
 	};								\
 	ARCH_DEFINE_STATIC_CALL_NULL_TRAMP(name)
 
@@ -202,7 +200,6 @@ extern long __static_call_return0(void);
 	DECLARE_STATIC_CALL(name, _func);				\
 	struct static_call_key STATIC_CALL_KEY(name) = {		\
 		.func = __static_call_return0,				\
-		.type = 1,						\
 	};								\
 	ARCH_DEFINE_STATIC_CALL_RET0_TRAMP(name)
 
diff --git a/include/linux/static_call_types.h b/include/linux/static_call_types.h
index 87c3598609e8..c4c4efb6f6fa 100644
--- a/include/linux/static_call_types.h
+++ b/include/linux/static_call_types.h
@@ -61,10 +61,10 @@ struct static_call_site {
 struct static_call_key {
 	void *func;
 	union {
-		/* bit 0: 0 = mods, 1 = sites */
+		/* bit 0: 0 = sites, 1 = mods */
 		unsigned long type;
-		struct static_call_mod *_mods;
 		struct static_call_site *_sites;
+		struct static_call_mod *_mods;
 	};
 };
 
diff --git a/kernel/static_call_inline.c b/kernel/static_call_inline.c
index 1328370d3cf6..41f6bda6773a 100644
--- a/kernel/static_call_inline.c
+++ b/kernel/static_call_inline.c
@@ -112,7 +112,7 @@ static inline void static_call_sort_entries(struct static_call_site *start,
 
 static inline bool static_call_key_has_mods(struct static_call_key *key)
 {
-	return !(key->type & 1);
+	return !!(key->type & 1);
 }
 
 static inline struct static_call_mod *static_call_key_mods(struct static_call_key *key)
@@ -120,12 +120,13 @@ static inline struct static_call_mod *static_call_key_mods(struct static_call_ke
 	if (!static_call_key_has_mods(key))
 		return NULL;
 
-	return key->_mods;
+	return (struct static_call_mod *)(key->type & ~1);
 }
 
 static inline void static_call_key_set_mods(struct static_call_key *key, struct static_call_mod *mods)
 {
 	key->_mods = mods;
+	key->type |= 1;
 }
 
 static inline struct static_call_site *static_call_key_sites(struct static_call_key *key)
@@ -133,13 +134,12 @@ static inline struct static_call_site *static_call_key_sites(struct static_call_
 	if (static_call_key_has_mods(key))
 		return NULL;
 
-	return (struct static_call_site *)(key->type & ~1);
+	return key->_sites;
 }
 
 static inline void static_call_key_set_sites(struct static_call_key *key, struct static_call_site *sites)
 {
 	key->_sites = sites;
-	key->type |= 1;
 }
 
 void __static_call_update(struct static_call_key *key, void *tramp, void *func)
diff --git a/tools/include/linux/static_call_types.h b/tools/include/linux/static_call_types.h
index 87c3598609e8..c4c4efb6f6fa 100644
--- a/tools/include/linux/static_call_types.h
+++ b/tools/include/linux/static_call_types.h
@@ -61,10 +61,10 @@ struct static_call_site {
 struct static_call_key {
 	void *func;
 	union {
-		/* bit 0: 0 = mods, 1 = sites */
+		/* bit 0: 0 = sites, 1 = mods */
 		unsigned long type;
-		struct static_call_mod *_mods;
 		struct static_call_site *_sites;
+		struct static_call_mod *_mods;
 	};
 };
 
-- 
2.39.2