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kallsyms: fix build without execinfo 

commit a95743b53031b015e8949e845a9f6fdfb2656347 upstream.

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 c104c16073 ("Kunit to check the longest symbol
length") which starts to include linux/kallsyms.h with Alpine Linux'
configs.

Link: https://lkml.kernel.org/r/20250622014608.448718-1-fossdd@pwned.life
Fixes: c104c16073 ("Kunit to check the longest symbol length")
Signed-off-by: Achill Gilgenast <fossdd@pwned.life>
Cc: Luis Henriques <luis@igalia.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 688bf63ee6ba04cbaa47a1233716dddb821b7c26)
This commit is contained in:
Achill Gilgenast 2025-06-22 03:45:49 +02:00 committed by Wentao Guan
parent 18ff15d880
commit 925f8ffb82
1 changed files with 4 additions and 0 deletions
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4
tools/include/linux/kallsyms.h
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@ -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