powerpc/hugetlb: Fix 8M hugepages on 8xx
commit50a175dd18
upstream. With HW assistance all page tables must be 4k aligned, the 8xx drops the last 12 bits during the walk. Redefine HUGEPD_SHIFT_MASK to mask last 12 bits out. HUGEPD_SHIFT_MASK is used to for alignment of page table cache. Fixes:22569b881d
("powerpc/8xx: Enable 8M hugepage support with HW assistance") Cc: stable@vger.kernel.org # v5.0+ Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/778b1a248c4c7ca79640eeff7740044da6a220a0.1581264115.git.christophe.leroy@c-s.fr Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -295,8 +295,13 @@ static inline bool pfn_valid(unsigned long pfn)
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/*
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/*
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* Some number of bits at the level of the page table that points to
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* Some number of bits at the level of the page table that points to
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* a hugepte are used to encode the size. This masks those bits.
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* a hugepte are used to encode the size. This masks those bits.
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* On 8xx, HW assistance requires 4k alignment for the hugepte.
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*/
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*/
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#ifdef CONFIG_PPC_8xx
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#define HUGEPD_SHIFT_MASK 0xfff
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#else
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#define HUGEPD_SHIFT_MASK 0x3f
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#define HUGEPD_SHIFT_MASK 0x3f
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#endif
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#ifndef __ASSEMBLY__
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#ifndef __ASSEMBLY__
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