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| author | Yinghai Lu <yinghai@kernel.org> | 2009-03-02 23:36:13 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-03-03 08:50:22 +0100 |
| commit | 0fc59d3a01820765e5f3a723733728758b0cf577 (patch) | |
| tree | 1feae906b3ea81e6e8840900c14d63c1350998b5 | |
| parent | 2450cf51a1bdba7037e91b1bcc494b01c58aaf66 (diff) | |
| download | linux-stable-0fc59d3a01820765e5f3a723733728758b0cf577.tar.gz linux-stable-0fc59d3a01820765e5f3a723733728758b0cf577.tar.bz2 linux-stable-0fc59d3a01820765e5f3a723733728758b0cf577.zip | |
x86: fix init_memory_mapping() to handle small ranges
Impact: fix failed EFI bootup in certain circumstances
Ying Huang found init_memory_mapping() has problem with small ranges
less than 2M when he tried to direct map the EFI runtime code out of
max_low_pfn_mapped.
It turns out we never considered that case and didn't check the range...
Reported-by: Ying Huang <ying.huang@intel.com>
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Brian Maly <bmaly@redhat.com>
LKML-Reference: <49ACDDED.1060508@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
| -rw-r--r-- | arch/x86/mm/init_64.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index e6d36b490250..b1352250096e 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -714,6 +714,8 @@ unsigned long __init_refok init_memory_mapping(unsigned long start, pos = start_pfn << PAGE_SHIFT; end_pfn = ((pos + (PMD_SIZE - 1)) >> PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT); + if (end_pfn > (end >> PAGE_SHIFT)) + end_pfn = end >> PAGE_SHIFT; if (start_pfn < end_pfn) { nr_range = save_mr(mr, nr_range, start_pfn, end_pfn, 0); pos = end_pfn << PAGE_SHIFT; |