[EMAIL PROTECTED] (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). > > Patch is relative to 2.6.11-rc3-mm2 and relies on the ARCH_HAS_DEV_MEM > flag which isn't in Linus' nor Tony's trees yet.
Is it possible to avoid consuming a page flag? If this is an ia64-only (or 64-bit-only) thing I guess we could use bit 32. > + if (page->flags & PG_uncached) dude. That ain't gonna work ;) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
