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authorMichael Ellerman <michael@ellerman.id.au>2006-01-25 21:31:25 +1300
committerPaul Mackerras <paulus@samba.org>2006-02-07 21:28:38 +1100
commitfa93895329b87112cb1fd784db969e60b5b46af6 (patch)
treeed6d137b47ebcae1de85a21dc387b452fe728163 /arch/powerpc/kernel
parent3ea4807de7b2c5c903380ba2c2e7150bee942f42 (diff)
[PATCH] powerpc: Don't allocate zero bytes in finish_device_tree()
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>
Diffstat (limited to 'arch/powerpc/kernel')
-rw-r--r--arch/powerpc/kernel/prom.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index d50c8df0183..535a33e4aa3 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -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);