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commita95743b530upstream. 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 withc104c16073("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>