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x86, mm: limit MAXMEM on 64-bit 

on 64-bit x86 the physical memory limit is controlled by the sparsemem
bits - which are 44 bits right now. But MAXMEM (the max pfn number
e820 parsing will allow to enter our sizing routines) is set to
0x00003fffffffffff, i.e. 46 bits - that's too large because it overlaps
into the vmalloc range.

So couple MAXMEM to MAX_PHYSMEM_BITS, and add a comment that the
maximum of MAX_PHYSMEM_BITS is 45 bits.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Ingo Molnar 2008-12-16 19:23:36 +01:00
parent cfc319833b
commit b6fd6f2673
2 changed files with 2 additions and 2 deletions
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2
arch/x86/include/asm/pgtable_64.h
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@ -146,7 +146,7 @@ static inline void native_pgd_clear(pgd_t *pgd)
#define PGDIR_MASK (~(PGDIR_SIZE - 1))
#define MAXMEM _AC(0x00003fffffffffff, UL)
#define MAXMEM _AC(__AC(1, UL) << MAX_PHYSMEM_BITS, UL)
#define VMALLOC_START _AC(0xffffc20000000000, UL)
#define VMALLOC_END _AC(0xffffe1ffffffffff, UL)
#define VMEMMAP_START _AC(0xffffe20000000000, UL)

2
arch/x86/include/asm/sparsemem.h
View File

@ -27,7 +27,7 @@
#else /* CONFIG_X86_32 */
# define SECTION_SIZE_BITS 27 /* matt - 128 is convenient right now */
# define MAX_PHYSADDR_BITS 44
# define MAX_PHYSMEM_BITS 44
# define MAX_PHYSMEM_BITS 44 /* Can be max 45 bits */
#endif
#endif /* CONFIG_SPARSEMEM */