linux-kernel - [PATCH] virtio: uapi: avoid usage of libc types

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Message-Id: <20251222-uapi-virtio-v1-1-29390f87bcad@linutronix.de>
Date: Mon, 22 Dec 2025 09:00:33 +0100
From: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
To: "Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>, 
 Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, 
 Eugenio Pérez <eperezma@...hat.com>
Cc: virtualization@...ts.linux.dev, linux-kernel@...r.kernel.org, 
 Arnd Bergmann <arnd@...db.de>, 
 Thomas Weißschuh <thomas.weissschuh@...utronix.de>
Subject: [PATCH] virtio: uapi: avoid usage of libc types

Using libc types and headers from the UAPI headers is problematic as it
introduces a dependency on a full C toolchain.

On Linux 'unsigned long' works as a replacement for 'uintptr_t' and does
not depend on libc.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@...utronix.de>
---
 include/uapi/linux/virtio_ring.h | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/include/uapi/linux/virtio_ring.h b/include/uapi/linux/virtio_ring.h
index f8c20d3de8da..3c478582a3c2 100644
--- a/include/uapi/linux/virtio_ring.h
+++ b/include/uapi/linux/virtio_ring.h
@@ -31,9 +31,6 @@
  * SUCH DAMAGE.
  *
  * Copyright Rusty Russell IBM Corporation 2007. */
-#ifndef __KERNEL__
-#include <stdint.h>
-#endif
 #include <linux/types.h>
 #include <linux/virtio_types.h>

@@ -202,7 +199,7 @@ static inline void vring_init(struct vring *vr, unsigned int num, void *p,
 	vr->num = num;
 	vr->desc = p;
 	vr->avail = (struct vring_avail *)((char *)p + num * sizeof(struct vring_desc));
-	vr->used = (void *)(((uintptr_t)&vr->avail->ring[num] + sizeof(__virtio16)
+	vr->used = (void *)(((unsigned long)&vr->avail->ring[num] + sizeof(__virtio16)
 		+ align-1) & ~(align - 1));
 }

---
base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
change-id: 20251222-uapi-virtio-d208b915ca1d

Best regards,
-- 
Thomas Weißschuh <thomas.weissschuh@...utronix.de>