[v4] rust: transmute: implement FromBytes and AsBytes for inhabited ZSTs

[PATCH v4 0/2] rust: transmute: implement FromBytes and AsBytes for inhabited ZSTs

Alexandre Courbot posted 2 patches 2 days, 22 hours ago

Diff against v3
Download series mbox

drivers/gpu/nova-core/gsp/commands.rs | 6 +++---
rust/kernel/transmute.rs              | 8 ++++++++
2 files changed, 11 insertions(+), 3 deletions(-)

Expand all Fold all

[PATCH v4 0/2] rust: transmute: implement FromBytes and AsBytes for inhabited ZSTs

Posted by Alexandre Courbot 2 days, 22 hours ago

This is useful in Nova's GSP message handling, as some messages are
empty and we currently need to explicitly use an empty structure for
them.

If accepted, I would like to merge it through `drm-rust-next` so Nova
code can start using this feature quickly.

Signed-off-by: Alexandre Courbot <acourbot@nvidia.com>
---
Changes in v4:
- Improve safety comment to mention lack of invariants.
- Link to v3: https://patch.msgid.link/20251209-transmute_unit-v3-0-819fe584ba06@nvidia.com

Changes in v3:
- Use better safety statement. (thanks Gary!)
- Also add `PhantomData`. (thanks Gary!)
- Link to v2: https://patch.msgid.link/20251208-transmute_unit-v2-0-aa17a6848afb@nvidia.com

Changes in v2:
- Make use of new feature in Nova.
- Link to v1: https://patch.msgid.link/20251208-transmute_unit-v1-1-680c7386b5d9@nvidia.com

---
Alexandre Courbot (2):
      rust: transmute: implement FromBytes and AsBytes for inhabited ZSTs
      gpu: nova-core: gsp: use () as message type for GspInitDone message

 drivers/gpu/nova-core/gsp/commands.rs | 6 +++---
 rust/kernel/transmute.rs              | 8 ++++++++
 2 files changed, 11 insertions(+), 3 deletions(-)
---
base-commit: 8f0b4cce4481fb22653697cced8d0d04027cb1e8
change-id: 20251208-transmute_unit-78ab58ba9e6e

Best regards,
-- 
Alexandre Courbot <acourbot@nvidia.com>