linux-kernel - [PATCH v2 02/39] static_call: Avoid building empty .static_call

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Message-ID: <20220224151322.130666048@infradead.org>
Date:   Thu, 24 Feb 2022 15:51:40 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     x86@...nel.org, joao@...rdrivepizza.com, hjl.tools@...il.com,
        jpoimboe@...hat.com, andrew.cooper3@...rix.com
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org,
        ndesaulniers@...gle.com, keescook@...omium.org,
        samitolvanen@...gle.com, mark.rutland@....com,
        alyssa.milburn@...el.com, mbenes@...e.cz, rostedt@...dmis.org,
        mhiramat@...nel.org, alexei.starovoitov@...il.com
Subject: [PATCH v2 02/39] static_call: Avoid building empty .static_call_sites

Without CONFIG_HAVE_STATIC_CALL_INLINE there's no point in creating
the .static_call_sites section and it's related symbols.

Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 include/asm-generic/vmlinux.lds.h |    4 ++++
 1 file changed, 4 insertions(+)

--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -398,6 +398,7 @@
 	KEEP(*(__jump_table))						\
 	__stop___jump_table = .;
 
+#ifdef CONFIG_HAVE_STATIC_CALL_INLINE
 #define STATIC_CALL_DATA						\
 	. = ALIGN(8);							\
 	__start_static_call_sites = .;					\
@@ -406,6 +407,9 @@
 	__start_static_call_tramp_key = .;				\
 	KEEP(*(.static_call_tramp_key))					\
 	__stop_static_call_tramp_key = .;
+#else
+#define STATIC_CALL_DATA
+#endif
 
 /*
  * Allow architectures to handle ro_after_init data on their