Patch "powerpc/64s/hash: Allow MAP_FIXED allocations to cross 128TB boundary" has been added to the 4.14-stable tree

Patch "powerpc/64s/hash: Allow MAP_FIXED allocations to cross 128TB boundary" has been added to the 4.14-stable tree

[gregkh]

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;a=summary

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