[RFC v3 1/2] dynamic debug: add dynamic_hexdump_debug macro

[Bing Zhao]

dynamic_hexdump_debug(str, buf, len)

str: "prefix string"
buf: buffer pointer
len: length of the buffer being printed

Signed-off-by: Bing Zhao <bzhao@xxxxxxxxxxx>
---
v3: use "str" as prefix string (Joe Perches)
v2: rebase against linux-next.git tree and split into 2 patches

 include/linux/dynamic_debug.h |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h
index 0c9653f..06a7fed 100644
--- a/include/linux/dynamic_debug.h
+++ b/include/linux/dynamic_debug.h
@@ -70,6 +70,17 @@ extern int __dynamic_pr_debug(struct _ddebug *descriptor, const char *fmt, ...)
 		dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__);	\
 	} while (0)
 
+#define dynamic_hexdump_debug(str, buf, len)				\
+do {									\
+	static struct _ddebug descriptor				\
+	__used								\
+	__attribute__((section("__verbose"), aligned(8))) =		\
+	{ KBUILD_MODNAME, __func__, __FILE__, str, __LINE__,		\
+		_DPRINTK_FLAGS_DEFAULT };				\
+	if (unlikely(descriptor.enabled))				\
+		print_hex_dump_bytes(str, DUMP_PREFIX_OFFSET, buf, len);\
+} while (0)
+
 #else
 
 static inline int ddebug_remove_module(const char *mod)
@@ -81,6 +92,9 @@ static inline int ddebug_remove_module(const char *mod)
 	do { if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); } while (0)
 #define dynamic_dev_dbg(dev, fmt, ...)					\
 	do { if (0) dev_printk(KERN_DEBUG, dev, fmt, ##__VA_ARGS__); } while (0)
+#define dynamic_hexdump_debug(str, buf, len)				\
+	do { if (0) print_hex_dump_bytes(str, DUMP_PREFIX_OFFSET,	\
+						buf, len); } while (0)
 #endif
 
 #endif
-- 
1.6.2.5

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