This is a note to let you know that I've just added the patch titled

powerpc/64s/hash: Allow MAP_FIXED allocations to cross 128TB boundary

to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: powerpc-64s-hash-allow-map_fixed-allocations-to-cross-128tb-boundary.patch and it can be found in the queue-4.14 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From 35602f82d0c765f991420e319c8d3a596c921eb8 Mon Sep 17 00:00:00 2001

From: Nicholas Piggin npiggin@gmail.com Date: Fri, 10 Nov 2017 04:27:38 +1100 Subject: powerpc/64s/hash: Allow MAP_FIXED allocations to cross 128TB boundary

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)

Patches currently in stable-queue which might be from npiggin@gmail.com are

queue-4.14/powerpc-64s-hash-fix-128tb-512tb-virtual-address-boundary-case-allocation.patch queue-4.14/powerpc-64s-hash-fix-fork-with-512tb-process-address-space.patch queue-4.14/powerpc-64s-radix-fix-128tb-512tb-virtual-address-boundary-case-allocation.patch queue-4.14/powerpc-64s-hash-allow-map_fixed-allocations-to-cross-128tb-boundary.patch queue-4.14/powerpc-64s-hash-fix-512t-hint-detection-to-use-128t.patch