From: Marek Szyprowski <m.szyprowski@samsung.com>
To: "'Russell King - ARM Linux'" <linux@arm.linux.org.uk>
Cc: "'Linus Torvalds'" <torvalds@linux-foundation.org>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
"'Arnd Bergmann'" <arnd@arndb.de>,
"'Andrew Morton'" <akpm@linux-foundation.org>,
linaro-mm-sig@lists.linaro.org,
"'Michal Nazarewicz'" <mina86@mina86.com>,
"'Kyungmin Park'" <kyungmin.park@samsung.com>
Subject: RE: [GIT PULL] CMA and ARM DMA-mapping updates for v3.5
Date: Tue, 29 May 2012 16:50:45 +0200 [thread overview]
Message-ID: <015e01cd3daa$6d910e50$48b32af0$%szyprowski@samsung.com> (raw)
In-Reply-To: <20120529122932.GA24623@n2100.arm.linux.org.uk>
Hello,
On Tuesday, May 29, 2012 2:30 PM Russell King - ARM Linux wrote:
> I notice we have new warnings as a result of CMA being merged, though
> thankfully they're just in Kconfig:
>
> warning: (ARM) selects CMA which has unmet direct dependencies (HAVE_DMA_CONTIGUOUS &&
> HAVE_MEMBLOCK && EXPERIMENTAL)
>
> This seems totally weird: you're mandating that ARM must have CMA
> selected, but it's an experimental feature? So you're implying that
> the entire ARM kernel becomes totally experimental for the next
> release cycle?
>
> I think this needs fixing.
No, that wasn't my intention. I will provide a patch which removes unconditional dependency
on CMA - it will let one to disable CMA and use old allocation method if needed, but this
requires a few more changes in the dma-mapping implementation. I wasn't aware of the
consequences and no one has complained about this since v15 of CMA patches (Aug 2011).
Best regards
--
Marek Szyprowski
Samsung Poland R&D Center
next prev parent reply other threads:[~2012-05-29 14:50 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-22 7:40 Marek Szyprowski
2012-05-22 8:27 ` [Linaro-mm-sig] " Barry Song
2012-05-29 12:29 ` Russell King - ARM Linux
2012-05-29 14:50 ` Marek Szyprowski [this message]
2012-06-01 15:06 ` Russell King - ARM Linux
2012-05-30 8:59 ` [PATCH] ARM: dma-mapping: remove unconditional dependency on CMA Marek Szyprowski
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