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[PATCH] fix alloc_large_system_hash() roundup

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The "rounded up to nearest power of 2 in size" algorithm in
alloc_large_system_hash is not correct.  As coded, it takes an otherwise
acceptable power-of-2 value and doubles it.  For example, we see the error
if we boot with thash_entries=2097152 which produces a hash table with
4194304 entries.

Signed-off-by: John Hawkes <hawkes@sgi.com>
Cc: Roland Dreier <rdreier@cisco.com>
Cc: "Chen, Kenneth W" <kenneth.w.chen@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
John Hawkes 2006-03-25 03:08:02 -08:00 committed by Linus Torvalds
parent 962749af67
commit 6e692ed37a
1 changed files with 1 additions and 2 deletions
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3
mm/page_alloc.c
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@ -2702,8 +2702,7 @@ void *__init alloc_large_system_hash(const char *tablename,
else
numentries <<= (PAGE_SHIFT - scale);
}
/* rounded up to nearest power of 2 in size */
numentries = 1UL << (long_log2(numentries) + 1);
numentries = roundup_pow_of_two(numentries);
/* limit allocation size to 1/16 total memory by default */
if (max == 0) {