Messages in this thread | | | Date | Thu, 26 Aug 1999 12:10:55 +0200 | From | Benjamin Herrenschmidt <> | Subject | Re: Cache incoherencies |
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On Thu, Aug 26, 1999, Jes Sorensen <Jes.Sorensen@cern.ch> wrote:
>Ralf> There isn't a portable way to get uncached memory. But >Ralf> GFP_UNCACHED sounds good. > >On the m68k we have a kernel_set_cachemode() which does the job.
I looked at it, but I still prefer allocating uncachable space rather than setting the cache mode afterwards. Are there cases where you want to toggle the cache mode of a given range more than once ?
I prefer avoiding walking the page tables the way it's done in kernel_set_cachemode. Adding the GPF_UNCACHED flag seems a lot more maintainable to me, and requires really very few changes to implement.
But, of course, I may be wrong...
-- Perso. e-mail: <mailto:bh40@calva.net> Work e-mail: <mailto:benh@mipsys.com> BenH. Web : <http://calvaweb.calvacom.fr/bh40/>
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