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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2008-02-09 18:24:36 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2008-02-09 18:24:40 +0100 |
| commit | 5a216a20837c5f5fa1ca4b8ae8991ffd96b08e6f (patch) | |
| tree | dde54e28497e920fa460cc95dadb6b38f1b2dbe0 /arch/s390/mm/vmem.c | |
| parent | 146e4b3c8b92071b18f0b2e6f47165bad4f9e825 (diff) | |
[S390] Add four level page tables for CONFIG_64BIT=y.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/mm/vmem.c')
| -rw-r--r-- | arch/s390/mm/vmem.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/arch/s390/mm/vmem.c b/arch/s390/mm/vmem.c index 434491f8f47c..35d90a4720fd 100644 --- a/arch/s390/mm/vmem.c +++ b/arch/s390/mm/vmem.c @@ -69,7 +69,19 @@ static void __ref *vmem_alloc_pages(unsigned int order) return alloc_bootmem_pages((1 << order) * PAGE_SIZE); } -#define vmem_pud_alloc() ({ BUG(); ((pud_t *) NULL); }) +static inline pud_t *vmem_pud_alloc(void) +{ + pud_t *pud = NULL; + +#ifdef CONFIG_64BIT + pud = vmem_alloc_pages(2); + if (!pud) + return NULL; + pud_val(*pud) = _REGION3_ENTRY_EMPTY; + memcpy(pud + 1, pud, (PTRS_PER_PUD - 1)*sizeof(pud_t)); +#endif + return pud; +} static inline pmd_t *vmem_pmd_alloc(void) { |