[ Greg: -stable was Cc:-ed for this potentially buggy commit. ]
* Yinghai Lu <ying...@kernel.org> wrote:
> On Thu, Feb 14, 2013 at 7:08 AM, Ingo Molnar <mi...@kernel.org> wrote:
> > these three:
> >
> > 10d73e655cef mm: bootmem: fix free_all_bootmem_core() with odd bitmap
> > alignment
> > c060f943d092 mm: use aligned zone start for pfn_to_bitidx calculation
> > c0232ae861df mm: memblock: fix wrong memmove size in
> > memblock_merge_regions()
> >
> > might have highmem=512m boot parameter sensitivity.
>
> 10d73e655cef should not be related, as we are using nobootmem wrapper
> of memblock.
> c0232ae861df is copying less while using the blank slot in memblock
> memory or reserved array
> so it should be ok too.
>
> c060f943d092 may be related as you config does not have
> CONFIG_SPARSEMEM defined.
Right, that's the commit causing the x86 regression:
c060f943d0929f3e429c5d9522290584f6281d6e is the first bad commit
commit c060f943d0929f3e429c5d9522290584f6281d6e
Date: Fri Jan 11 14:31:51 2013 -0800
mm: use aligned zone start for pfn_to_bitidx calculation
I've given 6d92d4f (its parent commit) quite a bit of testing so
I'm 99% sure in the validity of this bisection result.
Involved parties Cc:-ed.
Revert attached below - it reverts cleanly and I'll test this
today, to see whether this solves the sporadic lockups.
Thanks,
Ingo
------------------->
>From 6f3d5a8f38eb23f792b408d9bc8fee53a7d158f9 Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mi...@kernel.org>
Date: Fri, 15 Feb 2013 12:43:22 +0100
Subject: [PATCH] Revert "mm: use aligned zone start for pfn_to_bitidx
calculation"
This reverts commit c060f943d0929f3e429c5d9522290584f6281d6e.
Causes lockups.
Signed-off-by: Ingo Molnar <mi...@kernel.org>
---
mm/page_alloc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index cf46618..3a120bb 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5590,7 +5590,7 @@ static inline int pfn_to_bitidx(struct zone *zone,
unsigned long pfn)
pfn &= (PAGES_PER_SECTION-1);
return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS;
#else
- pfn = pfn - round_down(zone->zone_start_pfn, pageblock_nr_pages);
+ pfn = pfn - zone->zone_start_pfn;
return (pfn >> pageblock_order) * NR_PAGEBLOCK_BITS;
#endif /* CONFIG_SPARSEMEM */
}
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