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[PATCH] x86_64: Fix overflow in NUMA hash function setup

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Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Keith Mannthey 2005-07-28 21:15:38 -07:00 committed by Linus Torvalds
parent 17158d17aa
commit b684664fd4
1 changed files with 26 additions and 24 deletions
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52
arch/x86_64/mm/numa.c
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@ -36,34 +36,36 @@ int numa_off __initdata;
int __init compute_hash_shift(struct node *nodes, int numnodes)
{
int i;
int shift = 24;
u64 addr;
int shift = 20;
unsigned long addr,maxend=0;
/* When in doubt use brute force. */
while (shift < 48) {
memset(memnodemap,0xff,sizeof(*memnodemap) * NODEMAPSIZE);
for (i = 0; i < numnodes; i++) {
if (nodes[i].start == nodes[i].end)
continue;
for (addr = nodes[i].start;
addr < nodes[i].end;
addr += (1UL << shift)) {
if (memnodemap[addr >> shift] != 0xff &&
memnodemap[addr >> shift] != i) {
printk(KERN_INFO
"node %d shift %d addr %Lx conflict %d\n",
i, shift, addr, memnodemap[addr>>shift]);
goto next;
}
memnodemap[addr >> shift] = i;
}
}
return shift;
next:
for (i = 0; i < numnodes; i++)
if ((nodes[i].start != nodes[i].end) && (nodes[i].end > maxend))
maxend = nodes[i].end;
while ((1UL << shift) < (maxend / NODEMAPSIZE))
shift++;
printk (KERN_DEBUG"Using %d for the hash shift. Max adder is %lx \n",
shift,maxend);
memset(memnodemap,0xff,sizeof(*memnodemap) * NODEMAPSIZE);
for (i = 0; i < numnodes; i++) {
if (nodes[i].start == nodes[i].end)
continue;
for (addr = nodes[i].start;
addr < nodes[i].end;
addr += (1UL << shift)) {
if (memnodemap[addr >> shift] != 0xff) {
printk(KERN_INFO
"Your memory is not aligned you need to rebuild your kernel "
"with a bigger NODEMAPSIZE shift=%d adder=%lu\n",
shift,addr);
return -1;
}
memnodemap[addr >> shift] = i;
}
}
memset(memnodemap,0,sizeof(*memnodemap) * NODEMAPSIZE);
return -1;
return shift;
}
#ifdef CONFIG_SPARSEMEM