diff options
| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2017-03-09 17:24:07 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-03-09 11:48:47 -0800 |
| commit | c2febafc67734a62196c1b9dfba926412d4077ba (patch) | |
| tree | a61b7cd503e4c6d2fbb58f0cb53662ffd60b4c14 /mm/pagewalk.c | |
| parent | 048456dcf2c56ad6f6248e2899dda92fb6a613f6 (diff) | |
| download | lwn-c2febafc67734a62196c1b9dfba926412d4077ba.tar.gz lwn-c2febafc67734a62196c1b9dfba926412d4077ba.zip | |
mm: convert generic code to 5-level paging
Convert all non-architecture-specific code to 5-level paging.
It's mostly mechanical adding handling one more page table level in
places where we deal with pud_t.
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/pagewalk.c')
| -rw-r--r-- | mm/pagewalk.c | 32 |
1 files changed, 29 insertions, 3 deletions
diff --git a/mm/pagewalk.c b/mm/pagewalk.c index 03761577ae86..60f7856e508f 100644 --- a/mm/pagewalk.c +++ b/mm/pagewalk.c @@ -69,14 +69,14 @@ again: return err; } -static int walk_pud_range(pgd_t *pgd, unsigned long addr, unsigned long end, +static int walk_pud_range(p4d_t *p4d, unsigned long addr, unsigned long end, struct mm_walk *walk) { pud_t *pud; unsigned long next; int err = 0; - pud = pud_offset(pgd, addr); + pud = pud_offset(p4d, addr); do { again: next = pud_addr_end(addr, end); @@ -113,6 +113,32 @@ static int walk_pud_range(pgd_t *pgd, unsigned long addr, unsigned long end, return err; } +static int walk_p4d_range(pgd_t *pgd, unsigned long addr, unsigned long end, + struct mm_walk *walk) +{ + p4d_t *p4d; + unsigned long next; + int err = 0; + + p4d = p4d_offset(pgd, addr); + do { + next = p4d_addr_end(addr, end); + if (p4d_none_or_clear_bad(p4d)) { + if (walk->pte_hole) + err = walk->pte_hole(addr, next, walk); + if (err) + break; + continue; + } + if (walk->pmd_entry || walk->pte_entry) + err = walk_pud_range(p4d, addr, next, walk); + if (err) + break; + } while (p4d++, addr = next, addr != end); + + return err; +} + static int walk_pgd_range(unsigned long addr, unsigned long end, struct mm_walk *walk) { @@ -131,7 +157,7 @@ static int walk_pgd_range(unsigned long addr, unsigned long end, continue; } if (walk->pmd_entry || walk->pte_entry) - err = walk_pud_range(pgd, addr, next, walk); + err = walk_p4d_range(pgd, addr, next, walk); if (err) break; } while (pgd++, addr = next, addr != end); |