Nicholas Piggin <npig...@gmail.com> writes:
> While mapping hints with a length that cross 128TB are disallowed,
> MAP_FIXED allocations that cross 128TB are allowed. These are failing
> on hash (on radix they succeed). Add an additional case for fixed
> mappings to expand the addr_limit when crossing 128TB.
>
Reviewed-by: Aneesh Kumar K.V <aneesh.ku...@linux.vnet.ibm.com>
> Cc: "Aneesh Kumar K.V" <aneesh.ku...@linux.vnet.ibm.com>
> Fixes: f4ea6dcb08 ("powerpc/mm: Enable mappings above 128TB")
> Signed-off-by: Nicholas Piggin <npig...@gmail.com>
> ---
> arch/powerpc/mm/slice.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/mm/slice.c b/arch/powerpc/mm/slice.c
> index 3889201b560c..a4f93699194b 100644
> --- a/arch/powerpc/mm/slice.c
> +++ b/arch/powerpc/mm/slice.c
> @@ -418,7 +418,7 @@ unsigned long slice_get_unmapped_area(unsigned long addr,
> unsigned long len,
> unsigned long high_limit;
>
> high_limit = DEFAULT_MAP_WINDOW;
> - if (addr >= high_limit)
> + if (addr >= high_limit || (fixed && (addr + len > high_limit)))
> high_limit = TASK_SIZE;
>
> if (len > high_limit)
> --
> 2.15.0
