diff options
| author | Michael Ellerman <michael@ellerman.id.au> | 2006-01-25 21:31:25 +1300 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2006-02-07 21:28:38 +1100 |
| commit | fa93895329b87112cb1fd784db969e60b5b46af6 (patch) | |
| tree | ed6d137b47ebcae1de85a21dc387b452fe728163 /arch | |
| parent | 3ea4807de7b2c5c903380ba2c2e7150bee942f42 (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')
| -rw-r--r-- | arch/powerpc/kernel/prom.c | 7 |
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); |