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| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2013-11-18 13:28:12 +0400 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2013-12-09 04:40:29 +0400 |
| commit | 8937ba48dcf62b5cdf7abb93652914af16756f50 (patch) | |
| tree | e4c23e5e06ca3fa20318f3a45d3bb9d84f21c6af /arch/powerpc/mm/pgtable_64.c | |
| parent | c8c06f5a0dde0fed260c54d550962187f266ed0d (diff) | |
| download | linux-8937ba48dcf62b5cdf7abb93652914af16756f50.tar.xz | |
powerpc/mm: Only check for _PAGE_PRESENT in set_pte/pmd functions
We want to make sure we don't use these function when updating a pte
or pmd entry that have a valid hpte entry, because these functions
don't invalidate them. So limit the check to _PAGE_PRESENT bit.
Numafault core changes use these functions for updating _PAGE_NUMA bits.
That should be ok because when _PAGE_NUMA is set we can be sure that
hpte entries are not present.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/mm/pgtable_64.c')
| -rw-r--r-- | arch/powerpc/mm/pgtable_64.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c index 9d95786aa80f..02e8681fb865 100644 --- a/arch/powerpc/mm/pgtable_64.c +++ b/arch/powerpc/mm/pgtable_64.c @@ -687,7 +687,7 @@ void set_pmd_at(struct mm_struct *mm, unsigned long addr, pmd_t *pmdp, pmd_t pmd) { #ifdef CONFIG_DEBUG_VM - WARN_ON(!pmd_none(*pmdp)); + WARN_ON(pmd_val(*pmdp) & _PAGE_PRESENT); assert_spin_locked(&mm->page_table_lock); WARN_ON(!pmd_trans_huge(pmd)); #endif |