| Date | Wed, 21 Nov 2012 18:06:47 -0800 | From | tip-bot for Stefano Stabellini <> | Subject | [tip:x86/mm2] x86, mm: Add pointer about Xen mmu requirement for alloc_low_pages |
| |
Commit-ID: ddd3509df8f8d4f1cf4784f559d702ce00dc8846 Gitweb: http://git.kernel.org/tip/ddd3509df8f8d4f1cf4784f559d702ce00dc8846 Author: Stefano Stabellini <stefano.stabellini@eu.citrix.com> AuthorDate: Fri, 16 Nov 2012 19:39:05 -0800 Committer: H. Peter Anvin <hpa@linux.intel.com> CommitDate: Sat, 17 Nov 2012 11:59:28 -0800
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> --- arch/x86/mm/init.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c index 02cea14..cb4f8ba 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;
|