Re: [PATCH 1/2] dma-fence: Silence sparse warning in dma_fence_describe

["Christian König" <christian.koenig@amd.com>]

On 4/14/26 17:49, Tvrtko Ursulin wrote:
> Sparse complains about assigning a string to a __rcu annotated local
> variable:
> 
> drivers/dma-buf/dma-fence.c:1040:38: warning: incorrect type in initializer (different address spaces)
> drivers/dma-buf/dma-fence.c:1040:38:    expected char const [noderef] __rcu *timeline
> drivers/dma-buf/dma-fence.c:1040:38:    got char *
> drivers/dma-buf/dma-fence.c:1041:36: warning: incorrect type in initializer (different address spaces)
> drivers/dma-buf/dma-fence.c:1041:36:    expected char const [noderef] __rcu *driver
> drivers/dma-buf/dma-fence.c:1041:36:    got char *
> 
> It is harmless but lets silence it.
> 
> Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
> Fixes: ac364014fd81 ("dma-buf: cleanup dma_fence_describe v3")
> Cc: Christian König <christian.koenig@amd.com>
> Cc: linux-media@vger.kernel.org
> Cc: dri-devel@lists.freedesktop.org
> Cc: linaro-mm-sig@lists.linaro.org

Reviewed-by: Christian König <christian.koenig@amd.com>

> ---
>  drivers/dma-buf/dma-fence.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/dma-buf/dma-fence.c b/drivers/dma-buf/dma-fence.c
> index 1826ba73094c..a2aa82f4eedd 100644
> --- a/drivers/dma-buf/dma-fence.c
> +++ b/drivers/dma-buf/dma-fence.c
> @@ -1037,8 +1037,8 @@ EXPORT_SYMBOL(dma_fence_set_deadline);
>   */
>  void dma_fence_describe(struct dma_fence *fence, struct seq_file *seq)
>  {
> -	const char __rcu *timeline = "";
> -	const char __rcu *driver = "";
> +	const char __rcu *timeline = (const char __rcu *)"";
> +	const char __rcu *driver = (const char __rcu *)"";
>  	const char *signaled = "";
>  
>  	rcu_read_lock();