4.14-stable review patch. If anyone has any objections, please let me know.
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From: Nicholas Piggin npiggin@gmail.com
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@gmail.com Reviewed-by: Aneesh Kumar K.V aneesh.kumar@linux.vnet.ibm.com Signed-off-by: Michael Ellerman mpe@ellerman.id.au Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- 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)