On Wed, Jul 23, 2014 at 8:34 PM, Kristofer Hallin <kristofer.hallin@xxxxxxxxx> wrote:
1. No. Depending on what subsystem your are printing logs from you
should use different functions for logging. In the networking
subsystem netdev_dbg is suitable and so on. Otherwise pr_debug will
always work and is always preferred over printk.
By default, pr_debug is an empty macro unless you add -DDEBUG to CFLAGS. So in addition to what Kristofer said, be sure you compile your module/kernel with that flag enabled.
Cheers.
Cheers.
2. Use pr_debug.
On Wed, Jul 23, 2014 at 8:16 PM, Raphael Silva
<raphaelcampos.rp@xxxxxxxxx> wrote:
> Hello guys,
>
> 1)
> If I use printk(KERN_<LEVEL>...) the checkpatch warns me:
> WARNING: Prefer [subsystem eg: netdev]_dbg([subsystem]dev, ... then
> dev_dbg(dev, ... then pr_debug(... to printk(KERN_DEBUG ...
>
> So, pr_devel() is the correct way to print a debug level msg?
>
> 2)
> if pr_<level> is the correct way, what about KERN_DEFAULT ?
>
> If I don't put the kern_level (printk("Hello");)
> WARNING: printk() should include KERN_ facility level
>
> if I put KERN_DEFAULT:
> WARNING: Prefer [subsystem eg: netdev]_default([subsystem]dev, ... then
> dev_default(dev, ... then pr_default(... to printk(KERN_DEFAULT ...
>
> But for KERN_DEFAULT, there isn't a macro pr_<level> like pr_devel().
>
> Can anyone show me the correct way?
>
> tks
>
>
>
>
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