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[PATCH] powerpc: Don't allocate zero bytes in finish_device_tree()

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In prom.c we run finish_node() on allnodes twice. The first time we just
calculate how much memory we'll need, the second time we do the actual work.

If the calculation stage determines that we need 0 bytes, then we should skip
the lmb allocation. Although an alloc of zero will work, it has been seen to
lead to a BUG_ON() in reserve_bootmem() on at least one machine.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Michael Ellerman 2006-01-25 21:31:25 +13:00 committed by Paul Mackerras
parent 3ea4807de7
commit fa93895329
1 changed files with 6 additions and 1 deletions
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7
arch/powerpc/kernel/prom.c
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@ -491,7 +491,12 @@ void __init finish_device_tree(void)
size = 16;
finish_node(allnodes, &size, 1);
size -= 16;
end = start = (unsigned long) __va(lmb_alloc(size, 128));
if (0 == size)
end = start = 0;
else
end = start = (unsigned long)__va(lmb_alloc(size, 128));
finish_node(allnodes, &end, 0);
BUG_ON(end != start + size);