Subject: [PATCH v2 3/5] powerpc/64s/hash: Allow MAP_FIXED allocations to cross 128TB boundary

From: Nicholas Piggin <[email-masked]>
Date: Fri, 10 Nov 2017 04:27:38 +1100

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.

Cc: "Aneesh Kumar K.V" <[email-masked]>
Fixes: f4ea6dcb08 ("powerpc/mm: Enable mappings above 128TB")
Signed-off-by: Nicholas Piggin <[email-masked]>
---
 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