summaryrefslogtreecommitdiffstats
path: root/arch/x86/include/asm/sparsemem.h
diff options
context:
space:
mode:
authorIngo Molnar <mingo@elte.hu>2008-12-16 19:23:36 +0100
committerIngo Molnar <mingo@elte.hu>2008-12-16 19:31:52 +0100
commitb6fd6f26733e864fba2ea3eb1d716e23d2e66f3a (patch)
tree6b76b47a3366d502cbb8a740c15e9d2f46aea645 /arch/x86/include/asm/sparsemem.h
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/include/asm/sparsemem.h')
-rw-r--r--arch/x86/include/asm/sparsemem.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/include/asm/sparsemem.h b/arch/x86/include/asm/sparsemem.h
index be44f7dab39..e3cc3c063ec 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 */