Messages in this thread | | | Date | Wed, 06 Dec 2006 16:46:16 -0800 (PST) | Subject | Re: [PATCH] mm: D-cache aliasing issue in cow_user_page | From | David Miller <> |
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From: "Matt Reimer" <mattjreimer@gmail.com> Date: Wed, 6 Dec 2006 13:19:41 -0800
> On 12/5/06, David Miller <davem@davemloft.net> wrote: > > From: "Matt Reimer" <mattjreimer@gmail.com> > > Date: Tue, 5 Dec 2006 16:57:12 -0800 > > > > > Right, but isn't he declaring that each architecture needs to take > > > care of this? So, say, on ARM we'd need to make kunmap() not a NOP and > > > call flush_dcache_page() ? > > > > No. He is only solving a problem that occurs on HIGHMEM > > configurations on systems which can have D-cache aliasing > > issues. > > Are you sure? James specifically mentions "non-highmem architectures," > and "all architectures with coherence issues," which would seem to > include ARM (which is my concern). > > For your convenience I quote the whole commit message below.
Ok, I see.
He's providing it an alternative way to solve the coherency issues.
You can still solve it the traditional way via cache flushing in flush_dcache_page() and {copy,clear}_user_page(). - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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