Messages in this thread | | | Subject | Re: [patch -mm series] ia64 specific /dev/mem handlers | From | Arjan van de Ven <> | Date | Tue, 22 Feb 2005 23:03:53 +0100 |
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On Tue, 2005-02-22 at 04:52 -0500, Jes Sorensen wrote: > Hi, > > This patch introduces ia64 specific read/write handlers for /dev/mem > access which is needed to avoid uncached pages to be accessed through > the cached kernel window which can lead to random corruption. It also > introduces a new page-flag PG_uncached which will be used to mark the > uncached pages. I assume this may be useful to other architectures as > well where the CPU may use speculative reads which conflict with > uncached access. In addition I moved do_write_mem to be under > ARCH_HAS_DEV_MEM as it's only ever used if that is defined. > > The patch is needed for the new ia64 special memory driver (mspec - > former fetchop).
is there ANY valid reason to allow access to cached uses at all? (eg kernel ram)
why not just disable any such ram access entirely...
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