[PATCH 2/2] powerpc/64s: __find_linux_pte synchronization vs pmdp_invalidate

[Michael Ellerman]

On Fri, 2019-06-07 at 03:56:36 UTC, Nicholas Piggin wrote:
> The change to pmdp_invalidate to mark the pmd with _PAGE_INVALID broke
> the synchronisation against lock free lookups, __find_linux_pte's
> pmd_none check no longer returns true for such cases.
> 
> Fix this by adding a check for this condition as well.
> 
> Fixes: da7ad366b497 ("powerpc/mm/book3s: Update pmd_present to look at _PAGE_PRESENT bit")
> Cc: Christophe Leroy <christophe.leroy at c-s.fr>
> Suggested-by: Aneesh Kumar K.V <aneesh.kumar at linux.ibm.com>
> Signed-off-by: Nicholas Piggin <npiggin at gmail.com>
> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar at linux.ibm.com>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/a00196a272161338d4b1d66ec69e3d57

cheers