On Wed, 26 May 2004, Benjamin Herrenschmidt wrote:

quoted

So I think the code needs to invalidate the hash after having updated the 
pte. No?

No, we'll take a hash fault, not a page fault. The hash fault is an asm
fast path, which in this case, will update the HPTE RW permission when
the PTE has PAGE_RW (and will set PAGE_DIRTY again, but that's fine).

Ahh. Goodie. Then the "simple" atomic bitset probably works. Assuming I 
translated the asm/atomic.h stuff correctly.

		Linus
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