[v2, 1/5] powerpc/64s/hash: Fix 128TB-512TB virtual address boundary case allocation

[Michael Ellerman]

On Thu, 2017-11-09 at 17:27:36 UTC, Nicholas Piggin wrote:
> When allocating VA space with a hint that crosses 128TB, the SLB addr_limit
> variable is not expanded if addr is not > 128TB, but the slice allocation
> looks at task_size, which is 512TB. This results in slice_check_fit()
> incorrectly succeeding because the slice_count truncates off bit 128 of the
> requested mask, so the comparison to the available mask succeeds.
> 
> Fix this by using mm->context.addr_limit instead of mm->task_size for
> testing allocation limits. This causes such allocations to fail.
> 
> Cc: "Aneesh Kumar K.V" <aneesh.kumar at linux.vnet.ibm.com>
> Fixes: f4ea6dcb08 ("powerpc/mm: Enable mappings above 128TB")
> Reported-by: Florian Weimer <fweimer at redhat.com>
> Signed-off-by: Nicholas Piggin <npiggin at gmail.com>
> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar at linux.vnet.ibm.com>

Series applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/6a72dc038b615229a1b285829d6c83

cheers