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author | Wolfram Sang <wsa@the-dreams.de> | 2019-02-14 17:46:56 +0100 |
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committer | Wolfram Sang <wsa@the-dreams.de> | 2019-02-14 17:46:56 +0100 |
commit | 338618ad2a01b821a34e089a6607143fb283dee3 (patch) | |
tree | adf9aff96a5a087c820251f3eb09928b3271b007 /arch/powerpc/mm/pgtable-book3s64.c | |
parent | 18769445ca55c2277d29e35ffda7e9a206b1758f (diff) | |
parent | d13937116f1e82bf508a6325111b322c30c85eb9 (diff) |
Merge branch 'i2c/for-current' into i2c/for-5.1
Diffstat (limited to 'arch/powerpc/mm/pgtable-book3s64.c')
-rw-r--r-- | arch/powerpc/mm/pgtable-book3s64.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/powerpc/mm/pgtable-book3s64.c b/arch/powerpc/mm/pgtable-book3s64.c index f3c31f5e1026..ecd31569a120 100644 --- a/arch/powerpc/mm/pgtable-book3s64.c +++ b/arch/powerpc/mm/pgtable-book3s64.c @@ -400,3 +400,25 @@ void arch_report_meminfo(struct seq_file *m) atomic_long_read(&direct_pages_count[MMU_PAGE_1G]) << 20); } #endif /* CONFIG_PROC_FS */ + +/* + * For hash translation mode, we use the deposited table to store hash slot + * information and they are stored at PTRS_PER_PMD offset from related pmd + * location. Hence a pmd move requires deposit and withdraw. + * + * For radix translation with split pmd ptl, we store the deposited table in the + * pmd page. Hence if we have different pmd page we need to withdraw during pmd + * move. + * + * With hash we use deposited table always irrespective of anon or not. + * With radix we use deposited table only for anonymous mapping. + */ +int pmd_move_must_withdraw(struct spinlock *new_pmd_ptl, + struct spinlock *old_pmd_ptl, + struct vm_area_struct *vma) +{ + if (radix_enabled()) + return (new_pmd_ptl != old_pmd_ptl) && vma_is_anonymous(vma); + + return true; +} |