Messages in this thread | | | Date | Thu, 16 Feb 2012 21:32:08 +0800 | Subject | Re: [PATCH] mm: extend prefault helpers to fault in more than PAGE_SIZE | From | Hillf Danton <> |
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On Thu, Feb 16, 2012 at 8:01 PM, Daniel Vetter <daniel.vetter@ffwll.ch> wrote: > @@ -416,17 +417,20 @@ static inline int fault_in_pages_writeable(char __user *uaddr, int size) > * Writing zeroes into userspace here is OK, because we know that if > * the zero gets there, we'll be overwriting it. > */ > - ret = __put_user(0, uaddr); > + while (uaddr <= end) { > + ret = __put_user(0, uaddr); > + if (ret != 0) > + return ret; > + uaddr += PAGE_SIZE; > + }
What if uaddr & ~PAGE_MASK == PAGE_SIZE -3 && end & ~PAGE_MASK == 2 -- 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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