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mm: nobootmem: fix sign extend problem in __free_pages_memory() 

Systems with 8 TBytes of memory or greater can hit a problem where only
the the first 8 TB of memory shows up.  This is due to "int i" being
smaller than "unsigned long start_aligned", causing the high bits to be
dropped.

The fix is to change `i' to unsigned long to match start_aligned
and end_aligned.

Thanks to Jack Steiner for assistance tracking this down.

Signed-off-by: Russ Anderson <rja@sgi.com>
Cc: Jack Steiner <steiner@sgi.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: David S. Miller <davem@davemloft.net>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Gavin Shan <shangw@linux.vnet.ibm.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Russ Anderson 2012-05-10 13:01:46 -07:00 committed by Linus Torvalds
parent b8cd742acf
commit 6bc2e853c6
1 changed files with 1 additions and 2 deletions
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3
mm/nobootmem.c
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@ -82,8 +82,7 @@ void __init free_bootmem_late(unsigned long addr, unsigned long size)
static void __init __free_pages_memory(unsigned long start, unsigned long end)
{
int i;
unsigned long start_aligned, end_aligned;
unsigned long i, start_aligned, end_aligned;
int order = ilog2(BITS_PER_LONG);
start_aligned = (start + (BITS_PER_LONG - 1)) & ~(BITS_PER_LONG - 1);