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authorIngo Molnar <mingo@elte.hu>2008-12-16 13:23:36 -0500
committerIngo Molnar <mingo@elte.hu>2008-12-16 13:31:52 -0500
commitb6fd6f26733e864fba2ea3eb1d716e23d2e66f3a (patch)
tree6b76b47a3366d502cbb8a740c15e9d2f46aea645 /arch/x86
parentcfc319833b5b359bf3bce99564dbac00af7925ac (diff)
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>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/include/asm/pgtable_64.h2
-rw-r--r--arch/x86/include/asm/sparsemem.h2
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)
146#define PGDIR_MASK (~(PGDIR_SIZE - 1)) 146#define PGDIR_MASK (~(PGDIR_SIZE - 1))
147 147
148 148
149#define MAXMEM _AC(0x00003fffffffffff, UL) 149#define MAXMEM _AC(__AC(1, UL) << MAX_PHYSMEM_BITS, UL)
150#define VMALLOC_START _AC(0xffffc20000000000, UL) 150#define VMALLOC_START _AC(0xffffc20000000000, UL)
151#define VMALLOC_END _AC(0xffffe1ffffffffff, UL) 151#define VMALLOC_END _AC(0xffffe1ffffffffff, UL)
152#define VMEMMAP_START _AC(0xffffe20000000000, UL) 152#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 @@
27#else /* CONFIG_X86_32 */ 27#else /* CONFIG_X86_32 */
28# define SECTION_SIZE_BITS 27 /* matt - 128 is convenient right now */ 28# define SECTION_SIZE_BITS 27 /* matt - 128 is convenient right now */
29# define MAX_PHYSADDR_BITS 44 29# define MAX_PHYSADDR_BITS 44
30# define MAX_PHYSMEM_BITS 44 30# define MAX_PHYSMEM_BITS 44 /* Can be max 45 bits */
31#endif 31#endif
32 32
33#endif /* CONFIG_SPARSEMEM */ 33#endif /* CONFIG_SPARSEMEM */