From: Christoph Hellwig <hch@lst.de>
To: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Christoph Hellwig <hch@lst.de>,
tglx@linutronix.de, mingo@elte.hu, linux-kernel@vger.kernel.org,
iommu@lists.linux-foundation.org
Subject: Re: [PATCH] swiotlb: swiotlb_{alloc,free}_buffer should depend on CONFIG_DMA_DIRECT_OPS
Date: Mon, 26 Mar 2018 15:42:59 +0200 [thread overview]
Message-ID: <20180326134259.GA15387@lst.de> (raw)
In-Reply-To: <20180324200545.GC23658@char.us.oracle.com>
On Sat, Mar 24, 2018 at 04:05:45PM -0400, Konrad Rzeszutek Wilk wrote:
> > > > Otherwise we might get unused symbol warnings for configs that built
> > > > swiotlb.c only for use by xen-swiotlb.c and that don't otherwise select
> > > > CONFIG_DMA_DIRECT_OPS, which is possible on arm.
> > > >
> > > > Fixes: 16e73adbca76 ("dma/swiotlb: Remove swiotlb_{alloc,free}_coherent()")
> > > > Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
> > > > Signed-off-by: Christoph Hellwig <hch@lst.de>
> > >
> > >
> > > Alternatively could we set the Kconfig to slect DMA_DIRECT_OPS?
> >
> >
> > IFF we build swiotlb.c only for xen-swiotlb we don't need DMA_DIRECT_OPS.
>
> I don't think there is ever an case where you want a Xen specific build.
arm never uses swiotlb directly, so any swiotlb.c build on arm is purely
for xen-swiotlb.c
next prev parent reply other threads:[~2018-03-26 13:43 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-23 17:49 [PATCH] swiotlb: swiotlb_{alloc,free}_buffer should depend on CONFIG_DMA_DIRECT_OPS Christoph Hellwig
2018-03-23 18:57 ` Konrad Rzeszutek Wilk
2018-03-23 19:41 ` Thomas Gleixner
2018-03-24 17:03 ` Christoph Hellwig
2018-03-24 20:05 ` Konrad Rzeszutek Wilk
2018-03-26 13:42 ` Christoph Hellwig [this message]
2018-03-23 19:54 ` [tip:x86/dma] swiotlb: Make swiotlb_{alloc,free}_buffer " tip-bot for Christoph Hellwig
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