From: Bryn Reeves Add CONFIG_DM_DEBUG and DMDEBUG() macro. Signed-off-by: Bryn Reeves Signed-off-by: Alasdair G Kergon Signed-off-by: Andrew Morton --- drivers/md/Kconfig | 8 ++++++++ drivers/md/dm.h | 5 +++++ 2 files changed, 13 insertions(+) diff -puN drivers/md/Kconfig~dm-add-debug-macro drivers/md/Kconfig --- a/drivers/md/Kconfig~dm-add-debug-macro +++ a/drivers/md/Kconfig @@ -201,6 +201,14 @@ config BLK_DEV_DM If unsure, say N. +config DM_DEBUG + boolean "Device mapper debugging support" + depends on BLK_DEV_DM && EXPERIMENTAL + ---help--- + Enable this for messages that may help debug device-mapper problems. + + If unsure, say N. + config DM_CRYPT tristate "Crypt target support" depends on BLK_DEV_DM && EXPERIMENTAL diff -puN drivers/md/dm.h~dm-add-debug-macro drivers/md/dm.h --- a/drivers/md/dm.h~dm-add-debug-macro +++ a/drivers/md/dm.h @@ -21,6 +21,11 @@ #define DMERR(f, arg...) printk(KERN_ERR DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg) #define DMWARN(f, arg...) printk(KERN_WARNING DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg) #define DMINFO(f, arg...) printk(KERN_INFO DM_NAME ": " DM_MSG_PREFIX ": " f "\n", ## arg) +#ifdef CONFIG_DM_DEBUG +# define DMDEBUG(f, arg...) printk(KERN_DEBUG DM_NAME ": " DM_MSG_PREFIX " DEBUG: " f "\n", ## arg) +#else +# define DMDEBUG(f, arg...) do {} while (0) +#endif #define DMEMIT(x...) sz += ((sz >= maxlen) ? \ 0 : scnprintf(result + sz, maxlen - sz, x)) _