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| author | Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2012-11-16 19:39:05 -0800 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2012-11-17 11:59:28 -0800 |
| commit | ddd3509df8f8d4f1cf4784f559d702ce00dc8846 (patch) | |
| tree | ecbcc729cca0befbb5fba7a24f48b04e89c96ccb /arch/x86 | |
| parent | 22c8ca2ac256bb681be791858b35502b5d37e73b (diff) | |
| download | linux-ddd3509df8f8d4f1cf4784f559d702ce00dc8846.tar.bz2 | |
x86, mm: Add pointer about Xen mmu requirement for alloc_low_pages
Add link for more information
279b706 x86,xen: introduce x86_init.mapping.pagetable_reserve
-v2: updated to commets from hpa to include commit name.
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/1353123563-3103-29-git-send-email-yinghai@kernel.org
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/mm/init.c | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c index 02cea14c6d0c..cb4f8ba70ecc 100644 --- a/arch/x86/mm/init.c +++ b/arch/x86/mm/init.c @@ -25,6 +25,15 @@ unsigned long __meminitdata pgt_buf_top; static unsigned long min_pfn_mapped; +/* + * Pages returned are already directly mapped. + * + * Changing that is likely to break Xen, see commit: + * + * 279b706 x86,xen: introduce x86_init.mapping.pagetable_reserve + * + * for detailed information. + */ __ref void *alloc_low_pages(unsigned int num) { unsigned long pfn; |