tree 740b5a83f9d354edf255f44a6072a47ec1ff7ba0
parent ba7a4822b48fbc7afd6b567c18e316a03f46684d
author Benjamin Herrenschmidt <benh@kernel.crashing.org> 1331710624 +1100
committer Benjamin Herrenschmidt <benh@kernel.crashing.org> 1331850495 +1100

powerpc/hvc_udbg: Don't crash when udbg_putc is NULL

Also while at it, add some help text indicating why you shouldn't
enable that driver under normal circumstances

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>