btw., I tried to build perf on a really old distro that has no timerfd.h, and got:
builtin-kvm.c:22:25: error: sys/timerfd.h: No such file or directory cc1: warnings being treated as errors builtin-kvm.c: In function ‘perf_kvm__timerfd_create’: builtin-kvm.c:967: warning: implicit declaration of function ‘timerfd_create’ builtin-kvm.c:967: warning: nested extern declaration of ‘timerfd_create’ builtin-kvm.c:967: error: ‘TFD_NONBLOCK’ undeclared (first use in this function) builtin-kvm.c:967: error: (Each undeclared identifier is reported only once builtin-kvm.c:967: error: for each function it appears in.) builtin-kvm.c:978: warning: implicit declaration of function ‘timerfd_settime’ builtin-kvm.c:978: warning: nested extern declaration of ‘timerfd_settime’ make: *** [builtin-kvm.o] Error 1 make: *** Waiting for unfinished jobs.... The quick patch below made it build - but it's incomplete, I have not filled in the config/* details to generate HAVE_TIMERFD, I only made builtin-kvm.o build. Thanks, Ingo diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c index 935d522..5cae8f2 100644 --- a/tools/perf/builtin-kvm.c +++ b/tools/perf/builtin-kvm.c @@ -19,7 +19,22 @@ #include "util/top.h" #include <sys/prctl.h> -#include <sys/timerfd.h> +#ifdef HAVE_TIMERFD +# include <sys/timerfd.h> +#else +# define TFD_NONBLOCK -1 +static int timerfd_create(clockid_t __clock_id __maybe_unused, int __flags __maybe_unused) +{ + return -1; +} +static int timerfd_settime(int __ufd __maybe_unused, int __flags __maybe_unused, + const struct itimerspec *__utmr __maybe_unused, + struct itimerspec *__otmr __maybe_unused) +{ + return -1; +} + +#endif #include <termios.h> #include <semaphore.h> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/