diff options
| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2017-03-09 15:24:07 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-03-09 20:48:47 +0100 |
| commit | c2febafc67734a62196c1b9dfba926412d4077ba (patch) | |
| tree | a61b7cd503e4c6d2fbb58f0cb53662ffd60b4c14 /lib/ioremap.c | |
| parent | asm-generic: introduce <asm-generic/pgtable-nop4d.h> (diff) | |
| download | linux-c2febafc67734a62196c1b9dfba926412d4077ba.tar.xz linux-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 'lib/ioremap.c')
| -rw-r--r-- | lib/ioremap.c | 39 |
1 files changed, 36 insertions, 3 deletions
diff --git a/lib/ioremap.c b/lib/ioremap.c index a3e14ce92a56..4bb30206b942 100644 --- a/lib/ioremap.c +++ b/lib/ioremap.c @@ -14,6 +14,7 @@ #include <asm/pgtable.h> #ifdef CONFIG_HAVE_ARCH_HUGE_VMAP +static int __read_mostly ioremap_p4d_capable; static int __read_mostly ioremap_pud_capable; static int __read_mostly ioremap_pmd_capable; static int __read_mostly ioremap_huge_disabled; @@ -35,6 +36,11 @@ void __init ioremap_huge_init(void) } } +static inline int ioremap_p4d_enabled(void) +{ + return ioremap_p4d_capable; +} + static inline int ioremap_pud_enabled(void) { return ioremap_pud_capable; @@ -46,6 +52,7 @@ static inline int ioremap_pmd_enabled(void) } #else /* !CONFIG_HAVE_ARCH_HUGE_VMAP */ +static inline int ioremap_p4d_enabled(void) { return 0; } static inline int ioremap_pud_enabled(void) { return 0; } static inline int ioremap_pmd_enabled(void) { return 0; } #endif /* CONFIG_HAVE_ARCH_HUGE_VMAP */ @@ -94,14 +101,14 @@ static inline int ioremap_pmd_range(pud_t *pud, unsigned long addr, return 0; } -static inline int ioremap_pud_range(pgd_t *pgd, unsigned long addr, +static inline int ioremap_pud_range(p4d_t *p4d, unsigned long addr, unsigned long end, phys_addr_t phys_addr, pgprot_t prot) { pud_t *pud; unsigned long next; phys_addr -= addr; - pud = pud_alloc(&init_mm, pgd, addr); + pud = pud_alloc(&init_mm, p4d, addr); if (!pud) return -ENOMEM; do { @@ -120,6 +127,32 @@ static inline int ioremap_pud_range(pgd_t *pgd, unsigned long addr, return 0; } +static inline int ioremap_p4d_range(pgd_t *pgd, unsigned long addr, + unsigned long end, phys_addr_t phys_addr, pgprot_t prot) +{ + p4d_t *p4d; + unsigned long next; + + phys_addr -= addr; + p4d = p4d_alloc(&init_mm, pgd, addr); + if (!p4d) + return -ENOMEM; + do { + next = p4d_addr_end(addr, end); + + if (ioremap_p4d_enabled() && + ((next - addr) == P4D_SIZE) && + IS_ALIGNED(phys_addr + addr, P4D_SIZE)) { + if (p4d_set_huge(p4d, phys_addr + addr, prot)) + continue; + } + + if (ioremap_pud_range(p4d, addr, next, phys_addr + addr, prot)) + return -ENOMEM; + } while (p4d++, addr = next, addr != end); + return 0; +} + int ioremap_page_range(unsigned long addr, unsigned long end, phys_addr_t phys_addr, pgprot_t prot) { @@ -135,7 +168,7 @@ int ioremap_page_range(unsigned long addr, pgd = pgd_offset_k(addr); do { next = pgd_addr_end(addr, end); - err = ioremap_pud_range(pgd, addr, next, phys_addr+addr, prot); + err = ioremap_p4d_range(pgd, addr, next, phys_addr+addr, prot); if (err) break; } while (pgd++, addr = next, addr != end); |