Re: [PATCH] mm: extend prefault helpers to fault in more than PAGE_SIZE
From: Hillf Danton <hidden>
Date: 2012-02-16 13:32:11
Also in:
dri-devel, intel-gfx, lkml
On Thu, Feb 16, 2012 at 8:01 PM, Daniel Vetter [off-list ref] wrote:
quoted hunk ↗ jump to hunk
@@ -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
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