__virtio_test_bit(9)

💅 NAME 💅

okay so __virtio_test_bit is literally the helper to test feature bits — for use by transports, bestie. And a heads-up: devices should normally use virtio_has_feature, which includes more checks. This is the Kernel API Manual entry for __virtio_test_bit(9), and yes, it ate. 💖

✨ SYNOPSIS ✨

bool __virtio_test_bit (const struct virtio_device *vdev , unsigned int
       fbit );

🎀 ARGUMENTS 🎀

• vdev — the device. that's the whole vibe.
• fbit — the feature bit. iconic little detail, periodt.

🦋 SEE ALSO 🦋

Kernel file ./include/linux/virtio_config.h, plus the whole friend group:

• struct virtqueue_info(9)
• struct virtio_config_ops(9)
• struct virtio_map_ops(9)
• __virtio_set_bit(9)
• __virtio_clear_bit(9)
• virtio_has_feature(9)
• virtio_has_dma_quirk(9)
• virtio_synchronize_cbs(9)
• virtio_device_ready(9)
• virtqueue_set_affinity(9)

signed off from ./include/linux, dated October 2026 🫶✨