linux-kernel - [BUG] vhost: perf tools build error after syncing vhost.h

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Message-ID: <aKOLrqklBb9jdSxF@google.com>
Date: Mon, 18 Aug 2025 13:23:10 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: "Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>
Cc: kvm@...r.kernel.org, virtualization@...ts.linux.dev,
	linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...nel.org>
Subject: [BUG] vhost: perf tools build error after syncing vhost.h

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.

  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