4.14-stable review patch. If anyone has any objections, please let me know.
------------------
From: Nicholas Piggin <npiggin@xxxxxxxxx>
commit 35602f82d0c765f991420e319c8d3a596c921eb8 upstream.
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.
Fixes: f4ea6dcb08ea ("powerpc/mm: Enable mappings above 128TB")
Signed-off-by: Nicholas Piggin <npiggin@xxxxxxxxx>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/mm/slice.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/powerpc/mm/slice.c
+++ b/arch/powerpc/mm/slice.c
@@ -418,7 +418,7 @@ unsigned long slice_get_unmapped_area(un
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)