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List:       linux-parisc
Subject:    Re: [PATCH 6/7] dma-direct: handle DMA_ATTR_NO_KERNEL_MAPPING in common code
From:       Guenter Roeck <linux () roeck-us ! net>
Date:       2019-06-29 15:09:15
Message-ID: 20190629150915.GA817 () roeck-us ! net
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On Fri, Jun 14, 2019 at 04:44:30PM +0200, Christoph Hellwig wrote:
> DMA_ATTR_NO_KERNEL_MAPPING is generally implemented by allocating
> normal cacheable pages or CMA memory, and then returning the page
> pointer as the opaque handle.  Lift that code from the xtensa and
> generic dma remapping implementations into the generic dma-direct
> code so that we don't even call arch_dma_alloc for these allocations.
> 
> Signed-off-by: Christoph Hellwig <hch@lst.de>

This patch results in build failures for mips:nlm_xlp_defconfig and
mips:cavium_octeon_defconfig.

kernel/dma/direct.c:144: undefined reference to `arch_dma_prep_coherent'

Reverting the patch fixes the problem.

Guenter
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