• Linus Torvalds's avatar
    Merge tag 'remove-dma_zalloc_coherent-5.0' of git://git.infradead.org/users/hch/dma-mapping · 66c56cfa
    Linus Torvalds authored
    Pull dma_zalloc_coherent() removal from Christoph Hellwig:
     "We've always had a weird situation around dma_zalloc_coherent. To
      safely support mapping the allocations to userspace major
      architectures like x86 and arm have always zeroed allocations from
      dma_alloc_coherent, but a couple other architectures were missing that
      zeroing either always or in corner cases.
    
      Then later we grew anothe dma_zalloc_coherent interface to explicitly
      request zeroing, but that just added __GFP_ZERO to the allocation
      flags, which for some allocators that didn't end up using the page
      allocator ended up being a no-op and still not zeroing the
      allocations.
    
      So for this merge window I fixed up all remaining architectures to
      zero the memory in dma_alloc_coherent, and made dma_zalloc_coherent a
      no-op wrapper around dma_alloc_coherent, which fixes all of the above
      issues.
    
      dma_zalloc_coherent is now pointless and can go away, and Luis helped
      me writing a cocchinelle script and patch series to kill it, which I
      think we should apply now just after -rc1 to finally settle these
      issue"
    
    * tag 'remove-dma_zalloc_coherent-5.0' of git://git.infradead.org/users/hch/dma-mapping:
      dma-mapping: remove dma_zalloc_coherent()
      cross-tree: phase out dma_zalloc_coherent() on headers
      cross-tree: phase out dma_zalloc_coherent()
    66c56cfa
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