On Thu, Dec 8, 2016 at 12:17 AM, Daniel Vetter <daniel@xxxxxxxx> wrote:
>
> On Wed, Dec 07, 2016 at 06:35:29PM +0000, Robert Bragg wrote:
> > This is still missing corresponding documentation changes, and I haven't
> > moved anything to drm_print.h yet, as suggested.
> >
> > Sending out with a few functional improvements first to get agreement
> > before documenting anything (changes summarised in v2: section below)
> >
> > In particular, affecting the output format, I stole an idea from Tvrtko
> > Ursulin to have the prefix for messages be based on the driver name,
> > such as "[i915]" instead of always being "[drm]".
> >
> > Depending on peoples thoughts on compatibility, we could consider
> > removing the prefix given that the dynamic debug control interface has a
> > way of specifying that messages should include a module name, function
> > or line info like:
> >
> > echo "module i915 +mfp" > dynamic_debug/control
> >
> > That would enable all i915 debug messages with a module and function
> > prefix.
> >
> > A trade-off would be that anyone only using the drm.drm_debug interface
> > to control messages would loose some information. If we really wanted we
> > could have the best of both by adding a utility printing api that can
> > recognise when printing due to a dynamic debug control query vs
> > drm.drm_debug to conditionally add the prefix.
> >
> > --- >8 --- (git am --scissors)
> >
> > Dynamic debug messages (ref: Documentation/dynamic-debug-howto.txt)
> > allow fine grained control over which debug messages are enabled with
> > runtime control through /sysfs/kernel/debug/dynamic_debug/control
> >
> > This provides more control than the current drm.drm_debug parameter
> > which for some use cases is impractical to use given how chatty
> > some drm debug categories are.
> >
> > For example all debug messages in i915_drm.c can be enabled with:
> > echo "file i915_perf.c +p" > dynamic_debug/control
> >
> > This doesn't strictly maintain format compatibility with the previous
> > debug messages since the category is now added as part of the prefix
> > like "[drm][kms] No FB found". Adding the categories with a consistent
> > format makes it possible to enable categories with a dynamic debug
> > query like: echo "format [kms] +p" > dynamic_debug/control
> >
> > This maintains support for enabling debug messages using the drm_debug
> > parameter. If dynamic debug is not enabled via CONFIG_DYNAMIC_DEBUG the
> > debug messages essentially work as before, except with the inclusion of
> > categories in the format strings as described above.
> >
> > This removes the drm_[dev_]printk wrappers considering that the dynamic
> > debug macros are only useful if they can track the __FILE__, __func__
> > and __LINE__ where they are called. The wrapper didn't seem necessary in
> > the DRM_UT_NONE case with no category flag.
> >
> > The non _DEV macros are no longer defined in terms of passing NULL to a
> > _DEV variant to avoid have the core.c dev_printk implementation adding
> > "(NULL device *)". The previous drm_[dev_]prink function used to handle
> > this as a special case.
> >
> > Instead of using DRM_NAME to add [drm] to the start of every message,
> > the prefix is now based on module_name(THIS_MODULE) so it will be [drm]
> > or e.g. [i915] for the Intel driver. Later we might consider removing
> > the prefix altogether considering that the dynamic debug control
> > interface has a way of optionally adding the module, function or line to
> > the formatting of messages.
> >
> > v2:
> > Add categories to format like "[drm][kms] No FB found"
> > Only single conditional call per message (macros expand to less code)
> > Uses __dynamic_pr_debug/dev_dbg for dynamic formatting features
> > Use module name for msg prefix like [drm] or [i915]
> >
> > Signed-off-by: Robert Bragg <robert@xxxxxxxxxxxxx>
> > Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
> > Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
> > Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
>
> So assuming I understand it correctly - I like this 3way cascade of
> dynamic debug, then printk and no_printk fallback if CONFIG_DEBUG=n for
> the space concious. But I guess we do need to add a DRM Kconfig knob to
> set DEBUG, at least I'm not entirely sure how that's supposed to work. Or
> we might need to have our own #ifdef maze for this. Maybe we need to keep
> the old drm*printk stuff for that?
Right, I wasn't really sure who/what's responsible for defining DEBUG.
I just found this convention documented in Documentation/CodingStyle:
> Coming up with good debugging messages can be quite a challenge; and once
> you have them, they can be a huge help for remote troubleshooting. However
> debug message printing is handled differently than printing other non-debug
> messages. While the other pr_XXX() functions print unconditionally,
> pr_debug() does not; it is compiled out by default, unless either DEBUG is
> defined or CONFIG_DYNAMIC_DEBUG is set. That is true for dev_dbg() also,
> and a related convention uses VERBOSE_DEBUG to add dev_vdbg() messages to
> the ones already enabled by DEBUG.
>
> Many subsystems have Kconfig debug options to turn on -DDEBUG in the
> corresponding Makefile; in other cases specific files #define DEBUG. And
> when a debug message should be unconditionally printed, such as if it is
> already inside a debug-related #ifdef section, printk(KERN_DEBUG ...) can be
> used.
So I think if we want to follow something similar, we're missing a
general kconfig option like CONFIG_DEBUG_DRM that would handle adding
-DDDEBUG across drm core and the drivers. I did notice that a couple
of drm drivers do have their own options for this:
CONFIG_OMAP2_DSS_DEBUG and CONFIG_DRM_TEGRA_DEBUG.
>
>
> Anyway, I still think this is pretty cool, if we can get some common
> ground with Tvrtko's stuff and some acks and reviews then I can pull it
> in.
> -Daniel
>
> > ---
> > drivers/gpu/drm/drm_drv.c | 47 -----------
> > include/drm/drmP.h | 202 +++++++++++++++++++++++++++++-----------------
> > 2 files changed, 127 insertions(+), 122 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/drm_drv.c b/drivers/gpu/drm/drm_drv.c
> > index f74b7d0..25d00aa 100644
> > --- a/drivers/gpu/drm/drm_drv.c
> > +++ b/drivers/gpu/drm/drm_drv.c
> > @@ -65,53 +65,6 @@ static struct idr drm_minors_idr;
> >
> > static struct dentry *drm_debugfs_root;
> >
> > -#define DRM_PRINTK_FMT "[" DRM_NAME ":%s]%s %pV"
> > -
> > -void drm_dev_printk(const struct device *dev, const char *level,
> > - unsigned int category, const char *function_name,
> > - const char *prefix, const char *format, ...)
> > -{
> > - struct va_format vaf;
> > - va_list args;
> > -
> > - if (category != DRM_UT_NONE && !(drm_debug & category))
> > - return;
> > -
> > - va_start(args, format);
> > - vaf.fmt = format;
> > - vaf.va = &args;
> > -
> > - if (dev)
> > - dev_printk(level, dev, DRM_PRINTK_FMT, function_name, prefix,
> > - &vaf);
> > - else
> > - printk("%s" DRM_PRINTK_FMT, level, function_name, prefix, &vaf);
> > -
> > - va_end(args);
> > -}
> > -EXPORT_SYMBOL(drm_dev_printk);
> > -
> > -void drm_printk(const char *level, unsigned int category,
> > - const char *format, ...)
> > -{
> > - struct va_format vaf;
> > - va_list args;
> > -
> > - if (category != DRM_UT_NONE && !(drm_debug & category))
> > - return;
> > -
> > - va_start(args, format);
> > - vaf.fmt = format;
> > - vaf.va = &args;
> > -
> > - printk("%s" "[" DRM_NAME ":%ps]%s %pV",
> > - level, __builtin_return_address(0),
> > - strcmp(level, KERN_ERR) == 0 ? " *ERROR*" : "", &vaf);
> > -
> > - va_end(args);
> > -}
> > -EXPORT_SYMBOL(drm_printk);
> > -
> > /*
> > * DRM Minors
> > * A DRM device can provide several char-dev interfaces on the DRM-Major. Each
> > diff --git a/include/drm/drmP.h b/include/drm/drmP.h
> > index a9cfd33..0416114 100644
> > --- a/include/drm/drmP.h
> > +++ b/include/drm/drmP.h
> > @@ -58,6 +58,7 @@
> > #include <linux/vmalloc.h>
> > #include <linux/workqueue.h>
> > #include <linux/dma-fence.h>
> > +#include <linux/dynamic_debug.h>
> >
> > #include <asm/mman.h>
> > #include <asm/pgalloc.h>
> > @@ -129,15 +130,22 @@ struct dma_buf_attachment;
> > * run-time by echoing the debug value in its sysfs node:
> > * # echo 0xf > /sys/module/drm/parameters/debug
> > */
> > -#define DRM_UT_NONE 0x00
> > #define DRM_UT_CORE 0x01
> > +#define _DRM_UT_core 0x01
> > #define DRM_UT_DRIVER 0x02
> > +#define _DRM_UT_drv 0x02
> > #define DRM_UT_KMS 0x04
> > +#define _DRM_UT_kms 0x04
> > #define DRM_UT_PRIME 0x08
> > +#define _DRM_UT_prime 0x08
> > #define DRM_UT_ATOMIC 0x10
> > +#define _DRM_UT_atomic 0x10
> > #define DRM_UT_VBL 0x20
> > +#define _DRM_UT_vbl 0x20
> > #define DRM_UT_STATE 0x40
> >
> > +#define _DRM_PREFIX module_name(THIS_MODULE)
> > +
> > /***********************************************************************/
> > /** \name DRM template customization defaults */
> > /*@{*/
> > @@ -146,25 +154,19 @@ struct dma_buf_attachment;
> > /** \name Macros to make printk easier */
> > /*@{*/
> >
> > -#define _DRM_PRINTK(once, level, fmt, ...) \
> > - do { \
> > - printk##once(KERN_##level "[" DRM_NAME "] " fmt, \
> > - ##__VA_ARGS__); \
> > - } while (0)
> > -
> > -#define DRM_INFO(fmt, ...) \
> > - _DRM_PRINTK(, INFO, fmt, ##__VA_ARGS__)
> > -#define DRM_NOTE(fmt, ...) \
> > - _DRM_PRINTK(, NOTICE, fmt, ##__VA_ARGS__)
> > -#define DRM_WARN(fmt, ...) \
> > - _DRM_PRINTK(, WARNING, fmt, ##__VA_ARGS__)
> > -
> > -#define DRM_INFO_ONCE(fmt, ...) \
> > - _DRM_PRINTK(_once, INFO, fmt, ##__VA_ARGS__)
> > -#define DRM_NOTE_ONCE(fmt, ...) \
> > - _DRM_PRINTK(_once, NOTICE, fmt, ##__VA_ARGS__)
> > -#define DRM_WARN_ONCE(fmt, ...) \
> > - _DRM_PRINTK(_once, WARNING, fmt, ##__VA_ARGS__)
> > +#define DRM_INFO(fmt, args...) \
> > + pr_info("[%s] " fmt, _DRM_PREFIX, ##args)
> > +#define DRM_NOTE(fmt, args...) \
> > + pr_notice("[%s] " fmt, _DRM_PREFIX, ##args)
> > +#define DRM_WARN(fmt, args...) \
> > + pr_warn("[%s] " fmt, _DRM_PREFIX, ##args)
> > +
> > +#define DRM_INFO_ONCE(fmt, args...) \
> > + pr_info_once("[%s] " fmt, _DRM_PREFIX, ##args)
> > +#define DRM_NOTE_ONCE(fmt, args...) \
> > + pr_notice_once("[%s] " fmt, _DRM_PREFIX, ##args)
> > +#define DRM_WARN_ONCE(fmt, args...) \
> > + pr_warn_once("[%s] " fmt, _DRM_PREFIX, ##args)
> >
> > /**
> > * Error output.
> > @@ -172,11 +174,10 @@ struct dma_buf_attachment;
> > * \param fmt printf() like format string.
> > * \param arg arguments
> > */
> > -#define DRM_DEV_ERROR(dev, fmt, ...) \
> > - drm_dev_printk(dev, KERN_ERR, DRM_UT_NONE, __func__, " *ERROR*",\
> > - fmt, ##__VA_ARGS__)
> > -#define DRM_ERROR(fmt, ...) \
> > - drm_printk(KERN_ERR, DRM_UT_NONE, fmt, ##__VA_ARGS__)
> > +#define DRM_DEV_ERROR(dev, fmt, args...) \
> > + dev_err(dev, "[%s:%s]*ERROR*" fmt, _DRM_PREFIX, __func__, ##args)
> > +#define DRM_ERROR(fmt, args...) \
> > + pr_err("[%s:%s]*ERROR*" fmt, _DRM_PREFIX, __func__, ##args)
> >
> > /**
> > * Rate limited error output. Like DRM_ERROR() but won't flood the log.
> > @@ -184,81 +185,129 @@ struct dma_buf_attachment;
> > * \param fmt printf() like format string.
> > * \param arg arguments
> > */
> > -#define DRM_DEV_ERROR_RATELIMITED(dev, fmt, ...) \
> > +#define DRM_DEV_ERROR_RATELIMITED(dev, fmt, args...) \
> > ({ \
> > static DEFINE_RATELIMIT_STATE(_rs, \
> > DEFAULT_RATELIMIT_INTERVAL, \
> > DEFAULT_RATELIMIT_BURST); \
> > \
> > if (__ratelimit(&_rs)) \
> > - DRM_DEV_ERROR(dev, fmt, ##__VA_ARGS__); \
> > + DRM_DEV_ERROR(dev, fmt, ##args); \
> > })
> > -#define DRM_ERROR_RATELIMITED(fmt, ...) \
> > - DRM_DEV_ERROR_RATELIMITED(NULL, fmt, ##__VA_ARGS__)
> > -
> > -#define DRM_DEV_INFO(dev, fmt, ...) \
> > - drm_dev_printk(dev, KERN_INFO, DRM_UT_NONE, __func__, "", fmt, \
> > - ##__VA_ARGS__)
> > -
> > -#define DRM_DEV_INFO_ONCE(dev, fmt, ...) \
> > +#define DRM_ERROR_RATELIMITED(fmt, args...) \
> > ({ \
> > - static bool __print_once __read_mostly; \
> > - if (!__print_once) { \
> > - __print_once = true; \
> > - DRM_DEV_INFO(dev, fmt, ##__VA_ARGS__); \
> > - } \
> > + static DEFINE_RATELIMIT_STATE(_rs, \
> > + DEFAULT_RATELIMIT_INTERVAL, \
> > + DEFAULT_RATELIMIT_BURST); \
> > + \
> > + if (__ratelimit(&_rs)) \
> > + DRM_ERROR(fmt, ##args); \
> > })
> >
> > +#define DRM_DEV_INFO(dev, fmt, args...) \
> > + dev_info(dev, "[%s:%s] " fmt, _DRM_PREFIX, __func__, ##args)
> > +
> > +#define DRM_DEV_INFO_ONCE(dev, fmt, args...) \
> > + dev_info_once(dev, "[%s:%s] " fmt, _DRM_PREFIX, __func__, ##args)
> > +
> > /**
> > * Debug output.
> > *
> > * \param fmt printf() like format string.
> > * \param arg arguments
> > */
> > +
> > +#if defined(CONFIG_DYNAMIC_DEBUG)
> > +#define DRM_DEF_DYN_DEBUG_DATA(name, fmt) \
> > + DEFINE_DYNAMIC_DEBUG_METADATA(name, fmt);
> > +#define DRM_DYN_DEBUG_BRANCH(descriptor) \
> > + DYNAMIC_DEBUG_BRANCH(descriptor)
> > +
> > +#define __drm_dyn_dev_dbg(descriptor, dev, fmt, args...) \
> > + __dynamic_dev_dbg(descriptor, dev, fmt, ##args)
> > +#define __drm_dyn_pr_debug(descriptor, fmt, args...) \
> > + __dynamic_pr_debug(descriptor, fmt, ##args)
> > +#else
> > +#define DRM_DEF_DYN_DEBUG_DATA(name, fmt) do {} while(0)
> > +#define DRM_DYN_DEBUG_BRANCH(descriptor) 0
> > +
> > +#define __drm_dyn_dev_dbg(descriptor, dev, fmt, args...) \
> > + dev_dbg(dev, fmt, ##args)
> > +#define __drm_dyn_pr_debug(descriptor, fmt, args...) \
> > + pr_debug(fmt, ##args)
> > +#endif
> > +
> > +/* If modifying, note the duplication of the format strings for the
> > + * dynamic debug meta data and for passing to printk. We don't
> > + * deref descriptor->format to handle building without
> > + * CONFIG_DYNAMIC_DEBUG
> > + */
> > +#define _DRM_DEV_DEBUG(dev, cat, fmt, args...) \
> > +({ \
> > + DRM_DEF_DYN_DEBUG_DATA(descriptor, "[%s:%s]["#cat"] " fmt); \
> > + if (DRM_DYN_DEBUG_BRANCH(descriptor) || \
> > + unlikely(drm_debug & _DRM_UT_##cat)) { \
> > + __drm_dyn_dev_dbg(&descriptor, dev, \
> > + "[%s:%s]["#cat"] " fmt, \
> > + _DRM_PREFIX, __func__, ##args); \
> > + } \
> > +})
> > +#define _DRM_DEBUG(cat, fmt, args...) \
> > +({ \
> > + DRM_DEF_DYN_DEBUG_DATA(descriptor, "[%s:%s]["#cat"] " fmt); \
> > + if (DRM_DYN_DEBUG_BRANCH(descriptor) || \
> > + unlikely(drm_debug & _DRM_UT_##cat)) { \
> > + __drm_dyn_pr_debug(&descriptor, \
> > + "[%s:%s]["#cat"] " fmt, \
> > + _DRM_PREFIX, __func__, ##args); \
> > + } \
> > +})
> > +
> > #define DRM_DEV_DEBUG(dev, fmt, args...) \
> > - drm_dev_printk(dev, KERN_DEBUG, DRM_UT_CORE, __func__, "", fmt, \
> > - ##args)
> > -#define DRM_DEBUG(fmt, ...) \
> > - drm_printk(KERN_DEBUG, DRM_UT_CORE, fmt, ##__VA_ARGS__)
> > + _DRM_DEV_DEBUG(dev, core, fmt, ##args)
> > +#define DRM_DEBUG(fmt, args...) \
> > + _DRM_DEBUG(core, fmt, ##args)
> >
> > #define DRM_DEV_DEBUG_DRIVER(dev, fmt, args...) \
> > - drm_dev_printk(dev, KERN_DEBUG, DRM_UT_DRIVER, __func__, "", \
> > - fmt, ##args)
> > -#define DRM_DEBUG_DRIVER(fmt, ...) \
> > - drm_printk(KERN_DEBUG, DRM_UT_DRIVER, fmt, ##__VA_ARGS__)
> > + _DRM_DEV_DEBUG(dev, drv, fmt, ##args)
> > +#define DRM_DEBUG_DRIVER(fmt, args...) \
> > + _DRM_DEBUG(drv, fmt, ##args)
> >
> > #define DRM_DEV_DEBUG_KMS(dev, fmt, args...) \
> > - drm_dev_printk(dev, KERN_DEBUG, DRM_UT_KMS, __func__, "", fmt, \
> > - ##args)
> > -#define DRM_DEBUG_KMS(fmt, ...) \
> > - drm_printk(KERN_DEBUG, DRM_UT_KMS, fmt, ##__VA_ARGS__)
> > + _DRM_DEV_DEBUG(dev, kms, fmt, ##args)
> > +#define DRM_DEBUG_KMS(fmt, args...) \
> > + _DRM_DEBUG(kms, fmt, ##args)
> >
> > #define DRM_DEV_DEBUG_PRIME(dev, fmt, args...) \
> > - drm_dev_printk(dev, KERN_DEBUG, DRM_UT_PRIME, __func__, "", \
> > - fmt, ##args)
> > -#define DRM_DEBUG_PRIME(fmt, ...) \
> > - drm_printk(KERN_DEBUG, DRM_UT_PRIME, fmt, ##__VA_ARGS__)
> > + _DRM_DEV_DEBUG(dev, prime, fmt, ##args)
> > +#define DRM_DEBUG_PRIME(fmt, args...) \
> > + _DRM_DEBUG(prime, fmt, ##args)
> >
> > #define DRM_DEV_DEBUG_ATOMIC(dev, fmt, args...) \
> > - drm_dev_printk(dev, KERN_DEBUG, DRM_UT_ATOMIC, __func__, "", \
> > - fmt, ##args)
> > -#define DRM_DEBUG_ATOMIC(fmt, ...) \
> > - drm_printk(KERN_DEBUG, DRM_UT_ATOMIC, fmt, ##__VA_ARGS__)
> > + _DRM_DEV_DEBUG(dev, atomic, fmt, ##args)
> > +#define DRM_DEBUG_ATOMIC(fmt, args...) \
> > + _DRM_DEBUG(atomic, fmt, ##args)
> >
> > #define DRM_DEV_DEBUG_VBL(dev, fmt, args...) \
> > - drm_dev_printk(dev, KERN_DEBUG, DRM_UT_VBL, __func__, "", fmt, \
> > - ##args)
> > -#define DRM_DEBUG_VBL(fmt, ...) \
> > - drm_printk(KERN_DEBUG, DRM_UT_VBL, fmt, ##__VA_ARGS__)
> > + _DRM_DEV_DEBUG(dev, vbl, fmt, ##args)
> > +#define DRM_DEBUG_VBL(fmt, args...) \
> > + _DRM_DEBUG(vbl, fmt, ##args)
> >
> > -#define _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, level, fmt, args...) \
> > +#define _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, category, fmt, args...) \
> > ({ \
> > static DEFINE_RATELIMIT_STATE(_rs, \
> > DEFAULT_RATELIMIT_INTERVAL, \
> > DEFAULT_RATELIMIT_BURST); \
> > if (__ratelimit(&_rs)) \
> > - drm_dev_printk(dev, KERN_DEBUG, DRM_UT_ ## level, \
> > - __func__, "", fmt, ##args); \
> > + _DRM_DEV_DEBUG(dev, category, fmt, ##args); \
> > +})
> > +#define _DRM_DEFINE_DEBUG_RATELIMITED(category, fmt, args...) \
> > +({ \
> > + static DEFINE_RATELIMIT_STATE(_rs, \
> > + DEFAULT_RATELIMIT_INTERVAL, \
> > + DEFAULT_RATELIMIT_BURST); \
> > + if (__ratelimit(&_rs)) \
> > + _DRM_DEBUG(category, fmt, ##args); \
> > })
> >
> > /**
> > @@ -268,21 +317,24 @@ struct dma_buf_attachment;
> > * \param arg arguments
> > */
> > #define DRM_DEV_DEBUG_RATELIMITED(dev, fmt, args...) \
> > - DEV__DRM_DEFINE_DEBUG_RATELIMITED(dev, CORE, fmt, ##args)
> > + _DRM_DEFINE_DEBUG_RATELIMITED(dev, core, fmt, ##args)
> > #define DRM_DEBUG_RATELIMITED(fmt, args...) \
> > - DRM_DEV_DEBUG_RATELIMITED(NULL, fmt, ##args)
> > + _DRM_DEFINE_DEBUG_RATELIMITED(core, fmt, ##args)
> > +
> > #define DRM_DEV_DEBUG_DRIVER_RATELIMITED(dev, fmt, args...) \
> > - _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, DRIVER, fmt, ##args)
> > + _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, drv, fmt, ##args)
> > #define DRM_DEBUG_DRIVER_RATELIMITED(fmt, args...) \
> > - DRM_DEV_DEBUG_DRIVER_RATELIMITED(NULL, fmt, ##args)
> > + _DRM_DEV_DEFINE_DEBUG_RATELIMITED(drv, fmt, ##args)
> > +
> > #define DRM_DEV_DEBUG_KMS_RATELIMITED(dev, fmt, args...) \
> > - _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, KMS, fmt, ##args)
> > + _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, kms, fmt, ##args)
> > #define DRM_DEBUG_KMS_RATELIMITED(fmt, args...) \
> > - DRM_DEV_DEBUG_KMS_RATELIMITED(NULL, fmt, ##args)
> > + _DRM_DEFINE_DEBUG_RATELIMITED(kms, fmt, ##args)
> > +
> > #define DRM_DEV_DEBUG_PRIME_RATELIMITED(dev, fmt, args...) \
> > - _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, PRIME, fmt, ##args)
> > + _DRM_DEV_DEFINE_DEBUG_RATELIMITED(dev, prime, fmt, ##args)
> > #define DRM_DEBUG_PRIME_RATELIMITED(fmt, args...) \
> > - DRM_DEV_DEBUG_PRIME_RATELIMITED(NULL, fmt, ##args)
> > + _DRM_DEFINE_DEBUG_RATELIMITED(prime, fmt, ##args)
> >
> > /* Format strings and argument splitters to simplify printing
> > * various "complex" objects
> > --
> > 2.10.2
> >
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch
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