diff options
| author | David Daney <david.daney@cavium.com> | 2015-02-24 15:35:34 -0800 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2015-04-01 17:21:59 +0200 |
| commit | 5ae03b1220ac22b823d8414997329806db16020c (patch) | |
| tree | c82b4fbb8edf5593ab2deddc057fbd6561eb680f | |
| parent | 80aaaa8b93d860f828e2cf883f307894640765f0 (diff) | |
| download | linux-5ae03b1220ac22b823d8414997329806db16020c.tar.bz2 | |
MIPS: Expand __swp_offset() to carry 40 significant bits for 64-bit kernel.
With CONFIG_MIGRATION, the PFN of the migrating pages is stored in
__swp_offset(), so we must have enough bits to store the largest
possible PFN. OCTEON NUMA systems have 41 bits of physical address
space, so with 4K pages (12-bits), we need at least 29 bits to store
the PFN.
The current width of 24-bits is too narrow, so expand it all the way
out to 40-bits. This leaves the low order 16 bits as zero which does
not interfere with any of the PTE bits.
Signed-off-by: David Daney <david.daney@cavium.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9315/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
| -rw-r--r-- | arch/mips/include/asm/pgtable-64.h | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/arch/mips/include/asm/pgtable-64.h b/arch/mips/include/asm/pgtable-64.h index 1659bb91ae21..cf661a2fb141 100644 --- a/arch/mips/include/asm/pgtable-64.h +++ b/arch/mips/include/asm/pgtable-64.h @@ -279,14 +279,14 @@ extern void pgd_init(unsigned long page); extern void pmd_init(unsigned long page, unsigned long pagetable); /* - * Non-present pages: high 24 bits are offset, next 8 bits type, - * low 32 bits zero. + * Non-present pages: high 40 bits are offset, next 8 bits type, + * low 16 bits zero. */ static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset) -{ pte_t pte; pte_val(pte) = (type << 32) | (offset << 40); return pte; } +{ pte_t pte; pte_val(pte) = (type << 16) | (offset << 24); return pte; } -#define __swp_type(x) (((x).val >> 32) & 0xff) -#define __swp_offset(x) ((x).val >> 40) +#define __swp_type(x) (((x).val >> 16) & 0xff) +#define __swp_offset(x) ((x).val >> 24) #define __swp_entry(type, offset) ((swp_entry_t) { pte_val(mk_swap_pte((type), (offset))) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) |