Messages in this thread Patch in this message | | | Date | Sat, 1 Feb 2014 22:18:25 -0800 | From | tip-bot for Petr Tesarik <> | Subject | [tip:x86/urgent] x86: Fix the initialization of physnode_map |
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Commit-ID: 85fc73a2cdf10cf42bc36fb3bca3896b2095a1c2 Gitweb: http://git.kernel.org/tip/85fc73a2cdf10cf42bc36fb3bca3896b2095a1c2 Author: Petr Tesarik <ptesarik@suse.cz> AuthorDate: Sat, 1 Feb 2014 13:30:19 +0100 Committer: H. Peter Anvin <hpa@zytor.com> CommitDate: Sat, 1 Feb 2014 22:15:51 -0800
x86: Fix the initialization of physnode_map
With DISCONTIGMEM, the mapping between a pfn and its owning node is initialized using data provided by the BIOS. However, the initialization may fail if the extents are not aligned to section boundary (64M).
The symptom of this bug is an early boot failure in pfn_to_page(), as it tries to access NODE_DATA(__nid) using index from an unitialized element of the physnode_map[] array.
While the bug is always present, it is more likely to be hit in kdump kernels on large machines, because:
1. The memory map for a kdump kernel is specified as exactmap, and exactmap is more likely to be unaligned.
2. Large reservations are more likely to span across a 64M boundary.
[ hpa: fixed incorrect use of "pfn" instead of "start" ]
Signed-off-by: Petr Tesarik <ptesarik@suse.cz> Link: http://lkml.kernel.org/r/20140201133019.32e56f86@hananiah.suse.cz Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com> --- arch/x86/mm/numa_32.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/x86/mm/numa_32.c b/arch/x86/mm/numa_32.c index 0342d27..47b6436 100644 --- a/arch/x86/mm/numa_32.c +++ b/arch/x86/mm/numa_32.c @@ -52,6 +52,8 @@ void memory_present(int nid, unsigned long start, unsigned long end) nid, start, end); printk(KERN_DEBUG " Setting physnode_map array to node %d for pfns:\n", nid); printk(KERN_DEBUG " "); + start = round_down(start, PAGES_PER_SECTION); + end = round_up(end, PAGES_PER_SECTION); for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) { physnode_map[pfn / PAGES_PER_SECTION] = nid; printk(KERN_CONT "%lx ", pfn);
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