linux-kernel - Re: CONFIG_DMA_NOOP

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Message-ID: <960157c0-13ee-9953-d654-9891465c987d@infradead.org>
Date:   Sun, 15 Oct 2017 20:27:37 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Marian Mihailescu <marian.mihailescu@...laide.edu.au>,
        linux-kernel@...r.kernel.org
Cc:     Bart Van Assche <bart.vanassche@...disk.com>,
        iommu@...ts.linux-foundation.org
Subject: Re: CONFIG_DMA_NOOP_OPS breaks ARM arch

On 10/15/17 19:27, Marian Mihailescu wrote:
> After commit 7844572c633964c864d9f32dc3f2a8ffe5d70371, dma_noop_ops
> are built only for architectures that use it.
> 
> For ARM architecture, CONFIG_DMA_NOOP_OPS is not selected, and cannot
> be selected.
> 
> However, arch/arm/include/asm/dma-mapping.h is referencing dma_noop_ops:
> 
> static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
> {
> return IS_ENABLED(CONFIG_MMU) ? &arm_dma_ops : &dma_noop_ops;
> }
> 
> I will let a maintainer suggest the best resolution for this :)
> 

add Bart and iommu mailing list.


-- 
~Randy