linux-kernel - [PATCH v2] kallsyms: fix build without execinfo

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Message-ID: <20250615185821.824140-1-fossdd@pwned.life>
Date: Sun, 15 Jun 2025 20:58:17 +0200
From: Achill Gilgenast <fossdd@...ed.life>
To: linux-kernel@...r.kernel.org
Cc: Achill Gilgenast <fossdd@...ed.life>,
	stable@...r.kernel.org
Subject: [PATCH v2] kallsyms: fix build without execinfo

Some libc's like musl libc don't provide execinfo.h since it's not part
of POSIX. In order to fix compilation on musl, only include execinfo.h
if available (HAVE_BACKTRACE_SUPPORT)

This was discovered with c104c16073b7 ("Kunit to check the longest symbol length")
which starts to include linux/kallsyms.h with Alpine Linux' configs.

Signed-off-by: Achill Gilgenast <fossdd@...ed.life>
Cc: stable@...r.kernel.org
---
 tools/include/linux/kallsyms.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/include/linux/kallsyms.h b/tools/include/linux/kallsyms.h
index 5a37ccbec54f..f61a01dd7eb7 100644
--- a/tools/include/linux/kallsyms.h
+++ b/tools/include/linux/kallsyms.h
@@ -18,6 +18,7 @@ static inline const char *kallsyms_lookup(unsigned long addr,
 	return NULL;
 }
 
+#ifdef HAVE_BACKTRACE_SUPPORT
 #include <execinfo.h>
 #include <stdlib.h>
 static inline void print_ip_sym(const char *loglvl, unsigned long ip)
@@ -30,5 +31,8 @@ static inline void print_ip_sym(const char *loglvl, unsigned long ip)
 
 	free(name);
 }
+#else
+static inline void print_ip_sym(const char *loglvl, unsigned long ip) {}
+#endif
 
 #endif
-- 
2.50.0.rc2