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Commit 7d4340bb authored by Aneesh Kumar K.V's avatar Aneesh Kumar K.V Committed by Michael Ellerman
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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: default avatarAneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 6aba0c84

arch/powerpc/include/asm/sparsemem.h

+10 −3
Original line number Diff line number Diff line
@@ -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 */