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From: Andrew Morton <akpm@osdl.org> Date: Sun, 12 Feb 2006 18:13:12 -0800 > We have a page which has no ->mapping, but lo, it's mmapped by userspace > and can be MAP_SHARED between different CPUs and processes. > > Yes, I suspect it'll do the wrong thing in unpleasantly subtle ways. > > (cc's davem and runs away). The ->mapping check is there essentially to hit user mapped pages that would be modified by the kernel using kernel space memory accesses other than those done by copy_user_page() and clear_user_page() (and their brothers copy_user_highpage() and clear_user_highpage() which just call the former directly on a non-HIGHPAGE platform like sparc64). Hugepages actually have no D-cache aliasing issues by definition on sparc64 because the smallest possible hugepage size is 64K which is larger than the D-cache aliasing factor (which is 16K). - 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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