[PATCH] dm: add debug macro
Add CONFIG_DM_DEBUG and DMDEBUG() macro. Signed-off-by: NBryn Reeves <breeves@redhat.com> Signed-off-by: NAlasdair G Kergon <agk@redhat.com> Signed-off-by: NAndrew Morton <akpm@osdl.org> Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
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