From 7c33277b9a9ada187f805b41ffbebe6c51622fb6 Mon Sep 17 00:00:00 2001 From: Guenter Roeck Date: Thu, 30 May 2019 04:40:47 -0700 Subject: [PATCH] samples: fix pidfd-metadata compilation Define __NR_pidfd_send_signal if it isn't to prevent a compilation error. To make pidfd-metadata compile on all arches, irrespective of whether or not syscall numbers are assigned, define the syscall number to -1. If it isn't defined this will cause the kernel to return -ENOSYS. Fixes: 43c6afee48d4 ("samples: show race-free pidfd metadata access") Reported-by: Arnd Bergmann Reported-by: Guenter Roeck Cc: Christian Brauner Signed-off-by: Guenter Roeck [christian@brauner.io: tweak commit message] Signed-off-by: Christian Brauner --- samples/pidfd/pidfd-metadata.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/samples/pidfd/pidfd-metadata.c b/samples/pidfd/pidfd-metadata.c index 640f5f757c57..14b454448429 100644 --- a/samples/pidfd/pidfd-metadata.c +++ b/samples/pidfd/pidfd-metadata.c @@ -21,6 +21,10 @@ #define CLONE_PIDFD 0x00001000 #endif +#ifndef __NR_pidfd_send_signal +#define __NR_pidfd_send_signal -1 +#endif + static int do_child(void *args) { printf("%d\n", getpid());