linux-kernel - Re: [PATCH] swiotlb: use depends on for DMA_RESTRICTED

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Message-ID: <YS551niE8F5HzIaw@localhost.localdomain>
Date:   Tue, 31 Aug 2021 14:49:58 -0400
From:   Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To:     Will Deacon <will@...nel.org>
Cc:     Claire Chang <tientzu@...omium.org>, hch@....de,
        m.szyprowski@...sung.com, robin.murphy@....com,
        iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        linux@...ck-us.net
Subject: Re: [PATCH] swiotlb: use depends on for DMA_RESTRICTED_POOL

On Tue, Aug 31, 2021 at 04:17:47PM +0100, Will Deacon wrote:
> On Fri, Aug 27, 2021 at 11:48:02AM +0800, Claire Chang wrote:
> > Use depends on instead of select for DMA_RESTRICTED_POOL; otherwise it
> > will make SWIOTLB user configurable and cause compile errors for some
> > arch (e.g. mips).
> > 
> > Fixes: 0b84e4f8b793 ("swiotlb: Add restricted DMA pool initialization")
> > Reported-by: Guenter Roeck <linux@...ck-us.net>
> > Signed-off-by: Claire Chang <tientzu@...omium.org>
> > ---
> >  kernel/dma/Kconfig | 3 +--
> >  1 file changed, 1 insertion(+), 2 deletions(-)
> > 
> > diff --git a/kernel/dma/Kconfig b/kernel/dma/Kconfig
> > index fd4db714d86b..1b02179758cb 100644
> > --- a/kernel/dma/Kconfig
> > +++ b/kernel/dma/Kconfig
> > @@ -82,8 +82,7 @@ config SWIOTLB
> >  
> >  config DMA_RESTRICTED_POOL
> >  	bool "DMA Restricted Pool"
> > -	depends on OF && OF_RESERVED_MEM
> > -	select SWIOTLB
> > +	depends on OF && OF_RESERVED_MEM && SWIOTLB
> >  	help
> >  	  This enables support for restricted DMA pools which provide a level of
> >  	  DMA memory protection on systems with limited hardware protection
> 
> Acked-by: Will Deacon <will@...nel.org>

I put it in linux-next and devel/for-linus-5.15.

I will wait a day and see if there are any issues with linux-next and if
not will send out a GIT pull.

Thanks!


> 
> Will