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authorRuss Anderson <rja@sgi.com>2012-05-11 00:01:46 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2012-05-11 02:06:44 +0400
commit6bc2e853c6b46a6041980d58200ad9b0a73a60ff (patch)
tree8e36db26a891ee14f9341eaa77f698aeb44301d7 /mm/nobootmem.c
parentb8cd742acfd78a4689148fb80cf74bc26e7f1f3c (diff)
downloadlinux-6bc2e853c6b46a6041980d58200ad9b0a73a60ff.tar.xz
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>
Diffstat (limited to 'mm/nobootmem.c')
-rw-r--r--mm/nobootmem.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/mm/nobootmem.c b/mm/nobootmem.c
index e53bb8a256b1..1983fb1c7026 100644
--- a/mm/nobootmem.c
+++ b/mm/nobootmem.c
@@ -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);