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kallsyms: fix build without execinfo

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commit a95743b530 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>
This commit is contained in:
Achill Gilgenast 2025-06-22 03:45:49 +02:00 committed by Greg Kroah-Hartman
parent 8842fa503c
commit 7837fb8e97
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