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powerpc/64s/hash: Fix 512T hint detection to use >= 128T

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Currently userspace is able to request mmap() search between 128T-512T
by specifying a hint address that is greater than 128T. But that means
a hint of 128T exactly will return an address below 128T, which is
confusing and wrong.

So fix the logic to check the hint is greater than *or equal* to 128T.

Fixes: f4ea6dcb08 ("powerpc/mm: Enable mappings above 128TB")
Cc: stable@vger.kernel.org # v4.12+
Suggested-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Suggested-by: Nicholas Piggin <npiggin@gmail.com>
[mpe: Split out of Nick's bigger patch]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Michael Ellerman 2017-11-13 23:17:28 +11:00
parent f23ab3efb1
commit 7ece370996
1 changed files with 2 additions and 2 deletions
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4
arch/powerpc/mm/slice.c
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@ -419,7 +419,7 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
/*
* Check if we need to expland slice area.
*/
if (unlikely(addr > mm->context.addr_limit &&
if (unlikely(addr >= mm->context.addr_limit &&
mm->context.addr_limit != TASK_SIZE)) {
mm->context.addr_limit = TASK_SIZE;
on_each_cpu(slice_flush_segments, mm, 1);
@ -427,7 +427,7 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
/*
* This mmap request can allocate upt to 512TB
*/
if (addr > DEFAULT_MAP_WINDOW)
if (addr >= DEFAULT_MAP_WINDOW)
high_limit = mm->context.addr_limit;
else
high_limit = DEFAULT_MAP_WINDOW;