linux-kernel - [PATCH v2 05/11] static_call: Make ARCH_ADD_TRAMP

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Message-Id: <6a0d8889143580b3eac61ecabca783a5e8ad1bad.1679456900.git.jpoimboe@kernel.org>
Date:   Tue, 21 Mar 2023 21:00:11 -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 05/11] static_call: Make ARCH_ADD_TRAMP_KEY() generic

There's nothing arch-specific about ARCH_ADD_TRAMP_KEY().  Move it to
the generic static_call.h.

Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
---
 arch/x86/include/asm/static_call.h |  6 ------
 include/linux/static_call.h        | 11 +++++++++--
 2 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/arch/x86/include/asm/static_call.h b/arch/x86/include/asm/static_call.h
index 343b722ccaf2..52abbdfd6106 100644
--- a/arch/x86/include/asm/static_call.h
+++ b/arch/x86/include/asm/static_call.h
@@ -57,12 +57,6 @@
 #define ARCH_DEFINE_STATIC_CALL_RET0_TRAMP(name)			\
 	ARCH_DEFINE_STATIC_CALL_TRAMP(name, __static_call_return0)
 
-#define ARCH_ADD_TRAMP_KEY(name)					\
-	asm(".pushsection .static_call_tramp_key, \"a\"		\n"	\
-	    ".long " STATIC_CALL_TRAMP_STR(name) " - .		\n"	\
-	    ".long " STATIC_CALL_KEY_STR(name) " - .		\n"	\
-	    ".popsection					\n")
-
 extern bool __static_call_fixup(void *tramp, u8 op, void *dest);
 
 #endif /* _ASM_STATIC_CALL_H */
diff --git a/include/linux/static_call.h b/include/linux/static_call.h
index abce40166039..013022a8611d 100644
--- a/include/linux/static_call.h
+++ b/include/linux/static_call.h
@@ -213,10 +213,17 @@ extern long __static_call_return0(void);
 /* Leave the key unexported, so modules can't change static call targets: */
 #define EXPORT_STATIC_CALL_TRAMP(name)					\
 	EXPORT_SYMBOL(STATIC_CALL_TRAMP(name));				\
-	ARCH_ADD_TRAMP_KEY(name)
+	__STATIC_CALL_ADD_TRAMP_KEY(name)
 #define EXPORT_STATIC_CALL_TRAMP_GPL(name)				\
 	EXPORT_SYMBOL_GPL(STATIC_CALL_TRAMP(name));			\
-	ARCH_ADD_TRAMP_KEY(name)
+	__STATIC_CALL_ADD_TRAMP_KEY(name)
+
+/* Unexported key lookup table */
+#define __STATIC_CALL_ADD_TRAMP_KEY(name)				\
+	asm(".pushsection .static_call_tramp_key, \"a\"		\n"	\
+	    ".long " STATIC_CALL_TRAMP_STR(name) " - .		\n"	\
+	    ".long " STATIC_CALL_KEY_STR(name) " - .		\n"	\
+	    ".popsection					\n")
 
 #elif defined(CONFIG_HAVE_STATIC_CALL)
 
-- 
2.39.2