powerpc/mm/slice: Fix off-by-1 error when computing slice mask

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For low slice, max addr should be less than 4G. Without limiting this correctly
we will end up with a low slice mask which has 17th bit set. This is not
a problem with the current code because our low slice mask is of type u16. But
in later patch I am switching low slice mask to u64 type and having the 17bit
set result in wrong slice mask which in turn results in mmap failures.

Reviewed-by: Paul Mackerras <paulus@ozlabs.org>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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Aneesh Kumar K.V 2017-03-21 22:59:52 +05:30 • committed by Michael Ellerman

parent b42279f016

commit 98beda74de

1 changed files with 2 additions and 3 deletions

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arch/powerpc/mm/slice.c

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