On Thu, Apr 01, 2021 at 09:30:27AM -0500, Pierre-Louis Bossart wrote:
On 4/1/21 2:24 AM, Vinod Koul wrote:
On 31-03-21, 09:13, Bard Liao wrote:
From: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com
We sometimes discard -ENODATA when reporting errors and lose all traces of issues in the console log, add a macro to add use dev_dbg() in such cases.
Signed-off-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com Reviewed-by: Rander Wang rander.wang@intel.com Reviewed-by: Guennadi Liakhovetski guennadi.liakhovetski@linux.intel.com Signed-off-by: Bard Liao yung-chuan.liao@linux.intel.com
drivers/soundwire/bus.h | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/drivers/soundwire/bus.h b/drivers/soundwire/bus.h index 40354469860a..8370216f95d4 100644 --- a/drivers/soundwire/bus.h +++ b/drivers/soundwire/bus.h @@ -227,4 +227,12 @@ int sdw_bwrite_no_pm_unlocked(struct sdw_bus *bus, u16 dev_num, u32 addr, u8 val void sdw_clear_slave_status(struct sdw_bus *bus, u32 request); int sdw_slave_modalias(const struct sdw_slave *slave, char *buf, size_t size); +#define sdw_dev_dbg_or_err(dev, is_err, fmt, ...) \
- do { \
if (is_err) \dev_err(dev, fmt, __VA_ARGS__); \else \dev_dbg(dev, fmt, __VA_ARGS__); \- } while (0)
I see a variant in sof code and now here, why not add in a dev_dbg_or_err() and use everywhere?
Good point, I hesitated back and forth on specific v. generic macro.
The main reason why I added this macro for SoundWire is that quite a few subsystems have their own debug functions (DRM, ACPI, etc), and I wasn't sure if there was any appetite to add more options in include/linux/dev_printk.h. SOF also uses a different format due to history.
It is better if those other subsystems move to using the common kernel debug functions. Historically they were all separate, there is no good reason for them to be that way today.
So please do not create custom subsystem debug macros like this just for this tiny set of drivers.
My bigger issue with this is that this macro is crazy. Why do you need debugging here at all for this type of thing? That's what ftrace is for, do not sprinkle code with "we got this return value from here!" all over the place like what this does.
thanks,
greg k-h