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powerpc/mm: Fix build error with FLATMEM book3s64 config 

The current value of MAX_PHYSMEM_BITS cannot work with 32 bit configs.
We used to have MAX_PHYSMEM_BITS not defined without SPARSEMEM and 32
bit configs never expected a value to be set for MAX_PHYSMEM_BITS.

Dependent code such as zsmalloc derived the right values based on other
fields. Instead of finding a value that works with different configs,
use new values only for book3s_64. For 64 bit booke, use the definition
of MAX_PHYSMEM_BITS as per commit a7df61a0e2 ("[PATCH] ppc64: Increase sparsemem defaults")
That change was done in 2005 and hopefully will work with book3e 64.

Fixes: 8bc0868998 ("powerpc/mm: Only define MAX_PHYSMEM_BITS in SPARSEMEM configurations")
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 2019-04-03 11:35:14 +05:30 committed by Michael Ellerman
parent a68c31fc01
commit 6161a37307
3 changed files with 17 additions and 15 deletions
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15
arch/powerpc/include/asm/book3s/64/mmu.h
View File

@ -35,6 +35,21 @@ typedef pte_t *pgtable_t;
#endif /* __ASSEMBLY__ */
/*
* 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. Further depending on SPARSEMEM_EXTREME reduce
* memory requirements with large number of sections.
* 51 bits is the max physical real address on POWER9
*/
#if defined(CONFIG_SPARSEMEM_VMEMMAP) && defined(CONFIG_SPARSEMEM_EXTREME) && \
defined(CONFIG_PPC_64K_PAGES)
#define MAX_PHYSMEM_BITS 51
#else
#define MAX_PHYSMEM_BITS 46
#endif
/* 64-bit classic hash table MMU */
#include <asm/book3s/64/mmu-hash.h>

15
arch/powerpc/include/asm/mmu.h
View File

@ -349,21 +349,6 @@ static inline bool strict_kernel_rwx_enabled(void)
*/
#define MMU_PAGE_COUNT 16
/*
* 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. Further depending on SPARSEMEM_EXTREME reduce
* memory requirements with large number of sections.
* 51 bits is the max physical real address on POWER9
*/
#if defined(CONFIG_SPARSEMEM_VMEMMAP) && defined(CONFIG_SPARSEMEM_EXTREME) && \
defined (CONFIG_PPC_64K_PAGES)
#define MAX_PHYSMEM_BITS 51
#elif defined(CONFIG_PPC64)
#define MAX_PHYSMEM_BITS 46
#endif
#ifdef CONFIG_PPC_BOOK3S_64
#include <asm/book3s/64/mmu.h>
#else /* CONFIG_PPC_BOOK3S_64 */

2
arch/powerpc/include/asm/nohash/64/mmu.h
View File

@ -2,6 +2,8 @@
#ifndef _ASM_POWERPC_NOHASH_64_MMU_H_
#define _ASM_POWERPC_NOHASH_64_MMU_H_
#define MAX_PHYSMEM_BITS 44
/* Freescale Book-E software loaded TLB or Book-3e (ISA 2.06+) MMU */
#include <asm/nohash/mmu-book3e.h>