still nfs problems [Was: Linux 2.6.37-rc8]

Linus Torvalds torvalds at
Wed Jan 5 14:18:14 EST 2011

On Wed, Jan 5, 2011 at 11:05 AM, James Bottomley
<James.Bottomley at> wrote:
> I think the solution for the kernel direct mapping problem is to take
> the expected flushes and invalidates into kmap/kunmap[_atomic].

No, we really can't do that. Most of the time, the kmap() is the only
way we access the page anyway, so flushing things would just be
stupid. Why waste time and energy on doing something pointless?

In fact, kmap() here is a total non-issue. It's not the kmap() that
introduces any virtual aliases, and never has been. It's the
"vm_map_ram()" that is the problem. Unlike the kmap(), that really
_does_ introduce a virtual alias, and is a problem for any virtual

So don't blame kmap(). It's innocent and irrelevant - the bug could
happen entirely without it (think a 64-bit address space that doesn't
even _have_ kmap, but has software that mixes vm_map_ram() with
non-mapped accesses).


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