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    Subject[PATCH 01/44] device: add dev_WARN_ONCE
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    From: Felipe Balbi <balbi@ti.com>

    it's quite useful to print the device name
    on the stack dump caused by WARN(), but
    there are other cases where we might want
    to use WARN_ONCE.

    Introduce a helper similar to dev_WARN() for
    that case too.

    Signed-off-by: Felipe Balbi <balbi@ti.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
    ---
    include/linux/device.h | 6 +++++-
    1 files changed, 5 insertions(+), 1 deletions(-)

    diff --git a/include/linux/device.h b/include/linux/device.h
    index ab8dfc0..d484051 100644
    --- a/include/linux/device.h
    +++ b/include/linux/device.h
    @@ -742,13 +742,17 @@ do { \
    #endif

    /*
    - * dev_WARN() acts like dev_printk(), but with the key difference
    + * dev_WARN*() acts like dev_printk(), but with the key difference
    * of using a WARN/WARN_ON to get the message out, including the
    * file/line information and a backtrace.
    */
    #define dev_WARN(dev, format, arg...) \
    WARN(1, "Device: %s\n" format, dev_driver_string(dev), ## arg);

    +#define dev_WARN_ONCE(dev, condition, format, arg...) \
    + WARN_ONCE(condition, "Device %s\n" format, \
    + dev_driver_string(dev), ## arg)
    +
    /* Create alias, so I can be autoloaded. */
    #define MODULE_ALIAS_CHARDEV(major,minor) \
    MODULE_ALIAS("char-major-" __stringify(major) "-" __stringify(minor))
    --
    1.7.4.2


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