On Wed, Sep 26, 2012 at 7:59 PM, Tomi Valkeinen <tomi.valkeinen@xxxxxx> wrote:
> This doesn't work quite correctly. The problem is in dss.h, where we
> define DEBUG if CONFIG_OMAP2_DSS_DEBUG_SUPPORT is set. The thing is,
> DEBUG should be defined before including the kernel headers where the
> pr_debug etc are defined.
>
> So if you try the patches without dynamic debugging enabled, you won't
> get any debug outputs at all, even if CONFIG_OMAP2_DSS_DEBUG_SUPPORT is
> set.
>
> And for dynamic debug, the Kconfig help says:
>
> If a source file is compiled with DEBUG flag set, any
> pr_debug() calls in it are enabled by default, but can be
> disabled at runtime as below. Note that DEBUG flag is
> turned on by many CONFIG_*DEBUG* options.
>
> So if we have CONFIG_OMAP2_DSS_DEBUG_SUPPORT set, all the pr_debugs
> should be enabled by default, which is not the case, again because DEBUG
> is defined too late.
>
> I think setting DEBUG in dss.h should be removed, and instead DEBUG
> should be set in the makefile if CONFIG_OMAP2_DSS_DEBUG_SUPPORT is set.
>
> Tomi
>
Well the documentation lags in describing about the DEBUG flag. I
should have checked DYNAMIC_DEBUG in Kconfig and pr_debug definition
in printk.h file.
#if defined(CONFIG_DYNAMIC_DEBUG)
/* dynamic_pr_debug() uses pr_fmt() internally so we don't need it here */
#define pr_debug(fmt, ...) \
dynamic_pr_debug(fmt, ##__VA_ARGS__)
#elif defined(DEBUG)
#define pr_debug(fmt, ...) \
printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
#else
#define pr_debug(fmt, ...) \
no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
#endif
As per the definition above pr_debug is dynamic with
CONFIG_DYNAMIC_DEBUG set or else with DEBUG set it is just a normal
kernel debug printk as you have mentioned.
I still don't get how even if DEBUG is set before DSSDBG() is defined
in dss.c pr_debug() fails to enable.
Well anyways, how to do the same in the Makefile? I tried adding
ccflags-$(CONFIG_OMAP2_DSS_DEBUG_SUPPORT) += -DEBUG
to makefile in dss directory but of no use.
--
Chandrabhanu Mahapatra
Texas Instruments India Pvt. Ltd.
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