x86-64: Only set max_pfn_mapped to 512 MiB if we enter via head_64.S

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head_64.S maps up to 512 MiB, but that is not necessarity true for
other entry paths, such as Xen.

Thus, co-locate the setting of max_pfn_mapped with the code to
actually set up the page tables in head_64.S.  The 32-bit code is
already so co-located.  (The Xen code already sets max_pfn_mapped
correctly for its own use case.)

-v2:

 Yinghai fixed the following bug in this patch:

 |
 | max_pfn_mapped is in .bss section, so we need to set that
 | after bss get cleared. Without that we crash on bootup.
 |
 | That is safe because Xen does not call x86_64_start_kernel().
 |

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Fixed-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
LKML-Reference: <4CB6AB24.9020504@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

...

This commit is contained in:

Jeremy Fitzhardinge 2010-10-13 16:34:15 -07:00 • committed by Ingo Molnar

parent fef5ba7979

commit 67e87f0a1c

2 changed files with 2 additions and 1 deletions

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arch/x86/kernel/head64.c

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1

arch/x86/kernel/setup.c

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