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| author | Ingo Molnar <mingo@elte.hu> | 2008-12-16 19:23:36 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-12-16 19:31:52 +0100 |
| commit | b6fd6f26733e864fba2ea3eb1d716e23d2e66f3a (patch) | |
| tree | 6b76b47a3366d502cbb8a740c15e9d2f46aea645 | |
| parent | x86, 32-bit: improve lazy TLB handling code (diff) | |
| download | linux-b6fd6f26733e864fba2ea3eb1d716e23d2e66f3a.tar.xz linux-b6fd6f26733e864fba2ea3eb1d716e23d2e66f3a.zip | |
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>
| -rw-r--r-- | arch/x86/include/asm/pgtable_64.h | 2 | ||||
| -rw-r--r-- | arch/x86/include/asm/sparsemem.h | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/include/asm/pgtable_64.h b/arch/x86/include/asm/pgtable_64.h index 65b6be6677c7..c54ba69608bd 100644 --- a/arch/x86/include/asm/pgtable_64.h +++ b/arch/x86/include/asm/pgtable_64.h @@ -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) diff --git a/arch/x86/include/asm/sparsemem.h b/arch/x86/include/asm/sparsemem.h index be44f7dab395..e3cc3c063ec5 100644 --- a/arch/x86/include/asm/sparsemem.h +++ b/arch/x86/include/asm/sparsemem.h @@ -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 */ |