Hi Siddh, Thank you for the patch. On Tue, Jun 06, 2023 at 04:15:16PM +0530, Siddh Raman Pant wrote: > Comments say macros DRM_DEBUG_* are deprecated in favor of > drm_dbg_*(NULL, ...), but they have broken support for it, > as the macro will result in `(NULL) ? (NULL)->dev : NULL`. What's the problem there ? > Thus, fix them by separating logic to get dev ptr in a new > function, which will return the dev ptr if arg is not NULL. > Use it in drm_dbg_*, and also in __DRM_DEFINE_DBG_RATELIMITED, > where a similar (but correct) NULL check was in place. > > Also, add support for NULL in __drm_printk, so that all the > drm_* macros will hence support NULL as the first argument. > This also means that deprecation comments mentioning pr_()* > can now be changed to the drm equivalents. > > Signed-off-by: Siddh Raman Pant <code@xxxxxxxx> > --- > include/drm/drm_print.h | 79 +++++++++++++++++++++++++++-------------- > 1 file changed, 52 insertions(+), 27 deletions(-) > > diff --git a/include/drm/drm_print.h b/include/drm/drm_print.h > index a93a387f8a1a..4b8532cf2ae6 100644 > --- a/include/drm/drm_print.h > +++ b/include/drm/drm_print.h > @@ -34,6 +34,7 @@ > #include <linux/dynamic_debug.h> > > #include <drm/drm.h> > +#include <drm/drm_device.h> > > /* Do *not* use outside of drm_print.[ch]! */ > extern unsigned long __drm_debug; > @@ -451,9 +452,32 @@ void __drm_dev_dbg(struct _ddebug *desc, const struct device *dev, > * Prefer drm_device based logging over device or prink based logging. > */ > > +/* Helpers for struct drm_device based logging. */ > + > +/** > + * __drm_dev_ptr - Helper function to get drm->dev pointer. > + * @drm: struct drm_device pointer. > + * > + * RETURNS: > + * The struct device pointer (NULL if @drm is NULL). > + */ > +static inline struct device *__drm_dev_ptr(const struct drm_device *drm) > +{ > + if (drm) > + return drm->dev; > + > + return NULL; > +} > + > /* Helper for struct drm_device based logging. */ > #define __drm_printk(drm, level, type, fmt, ...) \ > - dev_##level##type((drm)->dev, "[drm] " fmt, ##__VA_ARGS__) > +({ \ > + struct device *__dev_ = __drm_dev_ptr(drm); \ > + if (__dev_) \ > + dev_##level##type(__dev_, "[drm] " fmt, ##__VA_ARGS__); \ > + else \ > + pr_##level##type("[drm] " fmt, ##__VA_ARGS__); \ If I recall correctly, dev_*() handle a NULL dev pointer just fine. Do we need to manually fall back to pr_*() ? > +}) > > > #define drm_info(drm, fmt, ...) \ > @@ -487,25 +511,25 @@ void __drm_dev_dbg(struct _ddebug *desc, const struct device *dev, > > > #define drm_dbg_core(drm, fmt, ...) \ > - drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_CORE, fmt, ##__VA_ARGS__) > -#define drm_dbg_driver(drm, fmt, ...) \ > - drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_DRIVER, fmt, ##__VA_ARGS__) > + drm_dev_dbg(__drm_dev_ptr(drm), DRM_UT_CORE, fmt, ##__VA_ARGS__) > +#define drm_dbg_driver(drm, fmt, ...) \ > + drm_dev_dbg(__drm_dev_ptr(drm), DRM_UT_DRIVER, fmt, ##__VA_ARGS__) > #define drm_dbg_kms(drm, fmt, ...) \ > - drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_KMS, fmt, ##__VA_ARGS__) > + drm_dev_dbg(__drm_dev_ptr(drm), DRM_UT_KMS, fmt, ##__VA_ARGS__) > #define drm_dbg_prime(drm, fmt, ...) \ > - drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_PRIME, fmt, ##__VA_ARGS__) > + drm_dev_dbg(__drm_dev_ptr(drm), DRM_UT_PRIME, fmt, ##__VA_ARGS__) > #define drm_dbg_atomic(drm, fmt, ...) \ > - drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_ATOMIC, fmt, ##__VA_ARGS__) > + drm_dev_dbg(__drm_dev_ptr(drm), DRM_UT_ATOMIC, fmt, ##__VA_ARGS__) > #define drm_dbg_vbl(drm, fmt, ...) \ > - drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_VBL, fmt, ##__VA_ARGS__) > + drm_dev_dbg(__drm_dev_ptr(drm), DRM_UT_VBL, fmt, ##__VA_ARGS__) > #define drm_dbg_state(drm, fmt, ...) \ > - drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_STATE, fmt, ##__VA_ARGS__) > + drm_dev_dbg(__drm_dev_ptr(drm), DRM_UT_STATE, fmt, ##__VA_ARGS__) > #define drm_dbg_lease(drm, fmt, ...) \ > - drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_LEASE, fmt, ##__VA_ARGS__) > + drm_dev_dbg(__drm_dev_ptr(drm), DRM_UT_LEASE, fmt, ##__VA_ARGS__) > #define drm_dbg_dp(drm, fmt, ...) \ > - drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_DP, fmt, ##__VA_ARGS__) > + drm_dev_dbg(__drm_dev_ptr(drm), DRM_UT_DP, fmt, ##__VA_ARGS__) > #define drm_dbg_drmres(drm, fmt, ...) \ > - drm_dev_dbg((drm) ? (drm)->dev : NULL, DRM_UT_DRMRES, fmt, ##__VA_ARGS__) > + drm_dev_dbg(__drm_dev_ptr(drm), DRM_UT_DRMRES, fmt, ##__VA_ARGS__) > > #define drm_dbg(drm, fmt, ...) drm_dbg_driver(drm, fmt, ##__VA_ARGS__) > > @@ -533,31 +557,31 @@ void __drm_err(const char *format, ...); > #define _DRM_PRINTK(once, level, fmt, ...) \ > printk##once(KERN_##level "[" DRM_NAME "] " fmt, ##__VA_ARGS__) > > -/* NOTE: this is deprecated in favor of pr_info(). */ > +/* NOTE: this is deprecated in favor of drm_info(NULL, ...). */ > #define DRM_INFO(fmt, ...) \ > _DRM_PRINTK(, INFO, fmt, ##__VA_ARGS__) > -/* NOTE: this is deprecated in favor of pr_notice(). */ > +/* NOTE: this is deprecated in favor of drm_notice(NULL, ...). */ > #define DRM_NOTE(fmt, ...) \ > _DRM_PRINTK(, NOTICE, fmt, ##__VA_ARGS__) > -/* NOTE: this is deprecated in favor of pr_warn(). */ > +/* NOTE: this is deprecated in favor of drm_warn(NULL, ...). */ > #define DRM_WARN(fmt, ...) \ > _DRM_PRINTK(, WARNING, fmt, ##__VA_ARGS__) > > -/* NOTE: this is deprecated in favor of pr_info_once(). */ > +/* NOTE: this is deprecated in favor of drm_info_once(NULL, ...). */ > #define DRM_INFO_ONCE(fmt, ...) \ > _DRM_PRINTK(_once, INFO, fmt, ##__VA_ARGS__) > -/* NOTE: this is deprecated in favor of pr_notice_once(). */ > +/* NOTE: this is deprecated in favor of drm_notice_once(NULL, ...). */ > #define DRM_NOTE_ONCE(fmt, ...) \ > _DRM_PRINTK(_once, NOTICE, fmt, ##__VA_ARGS__) > -/* NOTE: this is deprecated in favor of pr_warn_once(). */ > +/* NOTE: this is deprecated in favor of drm_warn_once(NULL, ...). */ > #define DRM_WARN_ONCE(fmt, ...) \ > _DRM_PRINTK(_once, WARNING, fmt, ##__VA_ARGS__) > > -/* NOTE: this is deprecated in favor of pr_err(). */ > +/* NOTE: this is deprecated in favor of drm_err(NULL, ...). */ > #define DRM_ERROR(fmt, ...) \ > __drm_err(fmt, ##__VA_ARGS__) > > -/* NOTE: this is deprecated in favor of pr_err_ratelimited(). */ > +/* NOTE: this is deprecated in favor of drm_err_ratelimited(NULL, ...). */ > #define DRM_ERROR_RATELIMITED(fmt, ...) \ > DRM_DEV_ERROR_RATELIMITED(NULL, fmt, ##__VA_ARGS__) > > @@ -593,13 +617,14 @@ void __drm_err(const char *format, ...); > #define DRM_DEBUG_DP(fmt, ...) \ > __drm_dbg(DRM_UT_DP, fmt, ## __VA_ARGS__) > > -#define __DRM_DEFINE_DBG_RATELIMITED(category, drm, fmt, ...) \ > -({ \ > - static DEFINE_RATELIMIT_STATE(rs_, DEFAULT_RATELIMIT_INTERVAL, DEFAULT_RATELIMIT_BURST);\ > - const struct drm_device *drm_ = (drm); \ > - \ > - if (drm_debug_enabled(DRM_UT_ ## category) && __ratelimit(&rs_)) \ > - drm_dev_printk(drm_ ? drm_->dev : NULL, KERN_DEBUG, fmt, ## __VA_ARGS__); \ > +#define __DRM_DEFINE_DBG_RATELIMITED(category, drm, fmt, ...) \ > +({ \ > + static DEFINE_RATELIMIT_STATE(rs_, DEFAULT_RATELIMIT_INTERVAL, \ > + DEFAULT_RATELIMIT_BURST); \ > + \ > + if (drm_debug_enabled(DRM_UT_ ## category) && __ratelimit(&rs_))\ > + drm_dev_printk(__drm_dev_ptr(drm), KERN_DEBUG, \ > + fmt, ## __VA_ARGS__); \ > }) > > #define drm_dbg_kms_ratelimited(drm, fmt, ...) \ -- Regards, Laurent Pinchart