diff options
| author | Yinghai Lu <[email protected]> | 2012-06-06 10:55:40 -0700 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2012-06-08 11:40:50 +0200 |
| commit | bd2753b2dda7bb43c7468826de75f49c6a7e8965 (patch) | |
| tree | 1c3c02c226132e257aa77b2db5ae56ed78f4e02b | |
| parent | 743628e868c5992354fc80b4d1e9a6143da1c0e6 (diff) | |
x86/mm: Only add extra pages count for the first memory range during pre-allocation early page table space
Robin found this regression:
| I just tried to boot an 8TB system. It fails very early in boot with:
| Kernel panic - not syncing: Cannot find space for the kernel page tables
git bisect commit 722bc6b16771ed80871e1fd81c86d3627dda2ac8.
A git revert of that commit does boot past that point on the 8TB
configuration.
That commit will add up extra pages for all memory range even
above 4g.
Try to limit that extra page count adding to first entry only.
Bisected-by: Robin Holt <[email protected]>
Tested-by: Robin Holt <[email protected]>
Signed-off-by: Yinghai Lu <[email protected]>
Cc: WANG Cong <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/CAE9FiQUj3wyzQxtq9yzBNc9u220p8JZ1FYHG7t%3DMOzJ%[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
| -rw-r--r-- | arch/x86/mm/init.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c index 97141c26a13a..bc4e9d84157f 100644 --- a/arch/x86/mm/init.c +++ b/arch/x86/mm/init.c @@ -62,7 +62,8 @@ static void __init find_early_table_space(struct map_range *mr, unsigned long en extra += PMD_SIZE; #endif /* The first 2/4M doesn't use large pages. */ - extra += mr->end - mr->start; + if (mr->start < PMD_SIZE) + extra += mr->end - mr->start; ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT; } else |