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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.

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>

authored by

Achill Gilgenast and committed by
Andrew Morton a95743b5 d7b8f8e2

+4
+4
tools/include/linux/kallsyms.h
··· 18 18 return NULL; 19 19 } 20 20 21 + #ifdef HAVE_BACKTRACE_SUPPORT 21 22 #include <execinfo.h> 22 23 #include <stdlib.h> 23 24 static inline void print_ip_sym(const char *loglvl, unsigned long ip) ··· 31 30 32 31 free(name); 33 32 } 33 + #else 34 + static inline void print_ip_sym(const char *loglvl, unsigned long ip) {} 35 + #endif 34 36 35 37 #endif