Commit a95743b5 authored by Achill Gilgenast's avatar Achill Gilgenast Committed by Andrew Morton
Browse files

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 c104c160 ("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: c104c160 ("Kunit to check the longest symbol length")
Signed-off-by: default avatarAchill 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: default avatarAndrew Morton <akpm@linux-foundation.org>
parent d7b8f8e2

tools/include/linux/kallsyms.h

+4 −0
Original line number Diff line number Diff line
@@ -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