drm: add DRM_ERROR_RATELIMITED (5d13d425) · Commits · 戴 / test

For error traces in situations that can run away, it is nice to have a rate-limited version of DRM_ERROR() to avoid massive log flooding. Signed-off-by:

Rob Clark <robdclark@gmail.com> Reviewed-by:

Thierry Reding <treding@nvidia.com> Signed-off-by:

Dave Airlie <airlied@redhat.com>

include/drm/drmP.h

+17 −0

Original line number	Diff line number	Diff line
		@@ -56,6 +56,7 @@
		#include <linux/mutex.h>
		#include <linux/io.h>
		#include <linux/slab.h>
		#include <linux/ratelimit.h>
		#if defined(__alpha__) \|\| defined(__powerpc__)
		#include <asm/pgtable.h> /* For pte_wrprotect */
		#endif
		@@ -180,6 +181,22 @@ int drm_err(const char func, const char format, ...);
		#define DRM_ERROR(fmt, ...) \
		drm_err(__func__, fmt, ##__VA_ARGS__)

		/**
		* Rate limited error output. Like DRM_ERROR() but won't flood the log.
		*
		* \param fmt printf() like format string.
		* \param arg arguments
		*/
		#define DRM_ERROR_RATELIMITED(fmt, ...) \
		({ \
		static DEFINE_RATELIMIT_STATE(_rs, \
		DEFAULT_RATELIMIT_INTERVAL, \
		DEFAULT_RATELIMIT_BURST); \
		\
		if (__ratelimit(&_rs)) \
		drm_err(__func__, fmt, ##__VA_ARGS__); \
		})

		#define DRM_INFO(fmt, ...) \
		printk(KERN_INFO "[" DRM_NAME "] " fmt, ##__VA_ARGS__)

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