linux-kernel - [tip: x86/core] static_call: Avoid building empty .static_call

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Date:   Tue, 15 Mar 2022 10:44:17 -0000
From:   "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/core] static_call: Avoid building empty .static_call_sites

The following commit has been merged into the x86/core branch of tip:

Commit-ID:     b44544fe0298ee2224960a31f795e317029e2a60
Gitweb:        https://git.kernel.org/tip/b44544fe0298ee2224960a31f795e317029e2a60
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Tue, 08 Mar 2022 16:30:12 +01:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Tue, 15 Mar 2022 10:32:31 +01:00

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>
Acked-by: Josh Poimboeuf <jpoimboe@...hat.com>
Link: https://lore.kernel.org/r/20220308154317.223798256@infradead.org
---
 include/asm-generic/vmlinux.lds.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index 42f3866..a41e623 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -404,6 +404,7 @@
 	KEEP(*(__jump_table))						\
 	__stop___jump_table = .;
 
+#ifdef CONFIG_HAVE_STATIC_CALL_INLINE
 #define STATIC_CALL_DATA						\
 	. = ALIGN(8);							\
 	__start_static_call_sites = .;					\
@@ -412,6 +413,9 @@
 	__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