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powerpc/mm: Increase MAX_PHYSMEM_BITS to 128TB with SPARSEMEM_VMEMMAP config 

We do this only with VMEMMAP config so that our page_to_[nid/section] etc are not
impacted.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Aneesh Kumar K.V 2018-06-21 14:01:58 +05:30 committed by Michael Ellerman
parent 6aba0c84ec
commit 7d4340bb92
1 changed files with 10 additions and 3 deletions
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13
arch/powerpc/include/asm/sparsemem.h
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@ -6,13 +6,20 @@
#ifdef CONFIG_SPARSEMEM
/*
* SECTION_SIZE_BITS 2^N: how big each section will be
* MAX_PHYSADDR_BITS 2^N: how much physical address space we have
* MAX_PHYSMEM_BITS 2^N: how much memory we can have in that space
*/
#define SECTION_SIZE_BITS 24
#define MAX_PHYSADDR_BITS 46
/*
* If we store section details in page->flags we can't increase the MAX_PHYSMEM_BITS
* if we increase SECTIONS_WIDTH we will not store node details in page->flags and
* page_to_nid does a page->section->node lookup
* Hence only increase for VMEMMAP.
*/
#ifdef CONFIG_SPARSEMEM_VMEMMAP
#define MAX_PHYSMEM_BITS 47
#else
#define MAX_PHYSMEM_BITS 46
#endif
#endif /* CONFIG_SPARSEMEM */