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| author | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2011-12-27 11:27:07 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2011-12-27 11:27:10 +0100 |
| commit | 14045ebf1e1156d966a796cacad91028e01797e5 (patch) | |
| tree | 75fd97e935a9c337e95dc5202bafbf2634cf170b /arch/s390/mm/pgtable.c | |
| parent | 4999023aa95a00507d3f100ea75510c5c7270f74 (diff) | |
| download | op-kernel-dev-14045ebf1e1156d966a796cacad91028e01797e5.zip op-kernel-dev-14045ebf1e1156d966a796cacad91028e01797e5.tar.gz | |
[S390] add support for physical memory > 4TB
The kernel address space of a 64 bit kernel currently uses a three level
page table and the vmemmap array has a fixed address and a fixed maximum
size. A three level page table is good enough for systems with less than
3.8TB of memory, for bigger systems four page table levels need to be
used. Each page table level costs a bit of performance, use 3 levels for
normal systems and 4 levels only for the really big systems.
To avoid bloating sparse.o too much set MAX_PHYSMEM_BITS to 46 for a
maximum of 64TB of memory.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/mm/pgtable.c')
| -rw-r--r-- | arch/s390/mm/pgtable.c | 11 |
1 files changed, 0 insertions, 11 deletions
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c index dc2269f..9a4d02f 100644 --- a/arch/s390/mm/pgtable.c +++ b/arch/s390/mm/pgtable.c @@ -33,17 +33,6 @@ #define FRAG_MASK 0x03 #endif -unsigned long VMALLOC_START = VMALLOC_END - VMALLOC_SIZE; -EXPORT_SYMBOL(VMALLOC_START); - -static int __init parse_vmalloc(char *arg) -{ - if (!arg) - return -EINVAL; - VMALLOC_START = (VMALLOC_END - memparse(arg, &arg)) & PAGE_MASK; - return 0; -} -early_param("vmalloc", parse_vmalloc); unsigned long *crst_table_alloc(struct mm_struct *mm) { |
