From: Emanuel Hilgart <emanuel@et-hilgart.de>
To: linux-mm@kvack.org
Subject: zone->wait_table_bits contains a wrong value
Date: Fri, 9 Jun 2006 22:51:55 +0200 [thread overview]
Message-ID: <200606092251.55231.emanuel@et-hilgart.de> (raw)
I am not sure if this is a bug.
The return value of wait_table_bits(unsigned long size) is too large.
hash_long(val,zone->wait_table_bits) exceeds the maximum array index of
zone->wait_table.
mm/page_alloc.c
/*
* This is an integer logarithm so that shifts can be used later
* to extract the more random high bits from the multiplicative
* hash function before the remainder is taken.
*/
static inline unsigned long wait_table_bits(unsigned long size)
{
return ffz(~size);
}
assumption:
wait_table_size := 0x10
conclusion:
wait_table_bits(0x10) = 5
hash_long(val,5) = [ 0 ; 0x1f ]
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reply other threads:[~2006-06-09 20:51 UTC|newest]
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