On Mon, Aug 18, 2025 at 01:23:10PM -0700, Namhyung Kim wrote: > Hello, > > I was sync'ing perf tools copy of kernel sources to apply recent > changes. But there's a build error when it converts vhost ioctl > commands due to a conflicting slot like below. I haven't looked at this specific case in detail, but in the past the synchronization of tools/ copies did catch things like this, yes :-) - Arnaldo > In file included from trace/beauty/ioctl.c:93: > tools/perf/trace/beauty/generated/ioctl/vhost_virtio_ioctl_array.c: In function ‘ioctl__scnprintf_vhost_virtio_cmd’: > tools/perf/trace/beauty/generated/ioctl/vhost_virtio_ioctl_array.c:36:18: error: initialized field overwritten [-Werror=override-init] > 36 | [0x83] = "SET_FORK_FROM_OWNER", > | ^~~~~~~~~~~~~~~~~~~~~ > tools/perf/trace/beauty/generated/ioctl/vhost_virtio_ioctl_array.c:36:18: note: (near initialization for ‘vhost_virtio_ioctl_cmds[131]’) > > I think the following changes both added entries to 0x83. > > 7d9896e9f6d02d8a vhost: Reintroduce kthread API and add mode selection > 333c515d189657c9 vhost-net: allow configuring extended features > > The below patch fixes it for me. > > Thanks, > Namhyung > > > ---8<--- > diff --git a/include/uapi/linux/vhost.h b/include/uapi/linux/vhost.h > index 283348b64af9ac59..c57674a6aa0dbbea 100644 > --- a/include/uapi/linux/vhost.h > +++ b/include/uapi/linux/vhost.h > @@ -260,7 +260,7 @@ > * When fork_owner is set to VHOST_FORK_OWNER_KTHREAD: > * - Vhost will create vhost workers as kernel threads. > */ > -#define VHOST_SET_FORK_FROM_OWNER _IOW(VHOST_VIRTIO, 0x83, __u8) > +#define VHOST_SET_FORK_FROM_OWNER _IOW(VHOST_VIRTIO, 0x84, __u8) > > /** > * VHOST_GET_FORK_OWNER - Get the current fork_owner flag for the vhost device. > @@ -268,6 +268,6 @@ > * > * @return: An 8-bit value indicating the current thread mode. > */ > -#define VHOST_GET_FORK_FROM_OWNER _IOR(VHOST_VIRTIO, 0x84, __u8) > +#define VHOST_GET_FORK_FROM_OWNER _IOR(VHOST_VIRTIO, 0x85, __u8) > > #endif
