Re: [PATCH] mm: D-cache aliasing issue in cow_user_page

In light of James Bottomsley's commit[1] declaring that kmap() and
friends now have to take care of coherency issues, is the patch "mm:
D-cache aliasing issue in cow_user_page"[2] correct, or could it
potentially cause a slowdown by calling flush_dcache_page() a second
time (i.e. once in an architecture-specific kmap() implementation, and
once in cow_user_page())?

Matt

[1] http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=a6ca1b99ed434f3fb41bbed647ed36c0420501e5
[2] http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=c4ec7b0de4bc18ccb4380de638550984d9a65c25
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