Re: [PATCH] ppc64: Fix possible race with set_pte on a present PTE

Linus Torvalds
2004-05-25T22:24:12Z

On Wed, 26 May 2004, Benjamin Herrenschmidt wrote:
> >
> > 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