6.1-stable review patch. If anyone has any objections, please let me know.
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From: Achill Gilgenast fossdd@pwned.life
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 c104c16073b7 ("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: c104c16073b7 ("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 --- 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