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author | Ingo Molnar <mingo@elte.hu> | 2008-07-18 19:53:16 +0200 |
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committer | Ingo Molnar <mingo@elte.hu> | 2008-07-18 19:53:16 +0200 |
commit | 9b610fda0df5d0f0b0c64242e37441ad1b384aac (patch) | |
tree | 0ea14b15f2e6546f37fe18d8ac3dc83077ec0e55 /include/asm-powerpc/pgtable-64k.h | |
parent | b8f8c3cf0a4ac0632ec3f0e15e9dc0c29de917af (diff) | |
parent | 5b664cb235e97afbf34db9c4d77f08ebd725335e (diff) | |
download | linux-stable-9b610fda0df5d0f0b0c64242e37441ad1b384aac.tar.gz linux-stable-9b610fda0df5d0f0b0c64242e37441ad1b384aac.tar.bz2 linux-stable-9b610fda0df5d0f0b0c64242e37441ad1b384aac.zip |
Merge branch 'linus' into timers/nohz
Diffstat (limited to 'include/asm-powerpc/pgtable-64k.h')
-rw-r--r-- | include/asm-powerpc/pgtable-64k.h | 17 |
1 files changed, 15 insertions, 2 deletions
diff --git a/include/asm-powerpc/pgtable-64k.h b/include/asm-powerpc/pgtable-64k.h index 1cbd6b377eea..c5007712473f 100644 --- a/include/asm-powerpc/pgtable-64k.h +++ b/include/asm-powerpc/pgtable-64k.h @@ -75,6 +75,20 @@ static inline struct subpage_prot_table *pgd_subpage_prot(pgd_t *pgd) #define _PAGE_COMBO 0x10000000 /* this is a combo 4k page */ #define _PAGE_4K_PFN 0x20000000 /* PFN is for a single 4k page */ +/* For 64K page, we don't have a separate _PAGE_HASHPTE bit. Instead, + * we set that to be the whole sub-bits mask. The C code will only + * test this, so a multi-bit mask will work. For combo pages, this + * is equivalent as effectively, the old _PAGE_HASHPTE was an OR of + * all the sub bits. For real 64k pages, we now have the assembly set + * _PAGE_HPTE_SUB0 in addition to setting the HIDX bits which overlap + * that mask. This is fine as long as the HIDX bits are never set on + * a PTE that isn't hashed, which is the case today. + * + * A little nit is for the huge page C code, which does the hashing + * in C, we need to provide which bit to use. + */ +#define _PAGE_HASHPTE _PAGE_HPTE_SUB + /* Note the full page bits must be in the same location as for normal * 4k pages as the same asssembly will be used to insert 64K pages * wether the kernel has CONFIG_PPC_64K_PAGES or not @@ -83,8 +97,7 @@ static inline struct subpage_prot_table *pgd_subpage_prot(pgd_t *pgd) #define _PAGE_F_GIX 0x00007000 /* full page: hidx bits */ /* PTE flags to conserve for HPTE identification */ -#define _PAGE_HPTEFLAGS (_PAGE_BUSY | _PAGE_HASHPTE | _PAGE_HPTE_SUB |\ - _PAGE_COMBO) +#define _PAGE_HPTEFLAGS (_PAGE_BUSY | _PAGE_HASHPTE | _PAGE_COMBO) /* Shift to put page number into pte. * |