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powerpc/mm: Fix infinite loop in hash fault with 4K page size 

This is the same bug we fixed as part of 09567e7fd4
("powerpc/mm: Check paca psize is up to date for huge mappings"). Please
check that for details. The difference here is that faults were
happening on a 4K page at an address previously mapped by hugetlb.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Reviewed-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Aneesh Kumar K.V 2015-11-28 22:39:33 +05:30 committed by Michael Ellerman
parent db1231dcdb
commit 0863d7f213
1 changed files with 2 additions and 1 deletions
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3
arch/powerpc/mm/hash_utils_64.c
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@ -1148,9 +1148,10 @@ int hash_page_mm(struct mm_struct *mm, unsigned long ea,
} }
} }
#endif /* CONFIG_PPC_64K_PAGES */
if (current->mm == mm) if (current->mm == mm)
check_paca_psize(ea, mm, psize, user_region); check_paca_psize(ea, mm, psize, user_region);
#endif /* CONFIG_PPC_64K_PAGES */
#ifdef CONFIG_PPC_64K_PAGES #ifdef CONFIG_PPC_64K_PAGES
if (psize == MMU_PAGE_64K) if (psize == MMU_PAGE_64K)