tip/x86/dma fix for arc and s390 (at least)

From: Christoph Hellwig
Date: Wed Mar 28 2018 - 09:35:50 EST

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Hi all,

this restores previous __GFP_ZERO passthrough behavior for now as arc and
s390 rely on it. Needs more work to sort out the API mess in the long run.

Next message: Christoph Hellwig: "[PATCH] dma-mapping: don't clear GFP_ZERO in dma_alloc_attrs"
Previous message: Bartlomiej Zolnierkiewicz: "Re: [PATCH v2 1/2] video/fbdev/stifb: Return -ENOMEM after a failed kzalloc() in stifb_init_fb()"
Next in thread: Christoph Hellwig: "[PATCH] dma-mapping: don't clear GFP_ZERO in dma_alloc_attrs"
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