Re: dma_zalloc_coherent broken with 57bf5a8963f80fb3828c46c3e3a5b2dd790e09a7

[Christoph Hellwig]

On Tue, Mar 27, 2018 at 10:12:54AM +0200, Sebastian Ott wrote:
> Hi,
> 
> commit 57bf5a8963f80fb3828c46c3e3a5b2dd790e09a7 broke usage of dma
> allocations specifying __GFP_ZERO by silently removing that flag.
> 
> Why should "the memory returned [] always be zeroed."?

Because that is what the current implementations do - we always zero
the memory returned from dma_map_ops.alloc().