Re: [PATCH] drm/buddy: Integrate lockdep annotations for gpu buddy manager

[Matthew Auld <matthew.auld@intel.com>]

On 29/04/2026 13:37, Tejas Upadhyay wrote:
> gpu_buddy APIs are expected to be called with the driver-provided lock
> held, but there is no runtime enforcement of this contract. Add lockdep
> annotations to catch locking violations early.
> 
> Introduce gpu_buddy_driver_set_lock() for the driver to register the
> lock that protects the buddy manager. Add gpu_buddy_driver_lock_held()
> assertions to all exported gpu_buddy and drm_buddy APIs that
> access/modify the manager state. The lock_dep_map field is only compiled
> in when CONFIG_LOCKDEP is enabled, adding zero overhead to production
> builds.
> 
> Wire up xe_ttm_vram_mgr to register its mutex with the buddy manager
> after initialization.
> 
> Assisted-by: Claude:claude-opus-4.6

I think add:

Suggested-by: Matthew Brost <matthew.brost@intel.com>

> Signed-off-by: Tejas Upadhyay <tejas.upadhyay@intel.com>

Reviewed-by: Matthew Auld <matthew.auld@intel.com>