linux-kernel - [PATCH] hexdump: do not print debug dumps for !CONFIG

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Date:	Wed, 22 Jul 2015 09:54:07 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org,
	Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH] hexdump: do not print debug dumps for !CONFIG_DEBUG

The function print_hex_dump_debug() is likely supposed to be
analogous to pr_debug() or dev_dbg() & friends. Currently it
will adhere to dynamic debug, but will not stub out prints if
CONFIG_DEBUG is not set. Let's make it do the right thing,
because I am tired of having my dmesg buffer full of hex
dumps on production systems.

Cc: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
Andrew: I think this is your file. I did spend some time
shaking my head thinking this basic thing just can't be wrong,
but it appears it is.
---
 include/linux/printk.h | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/include/linux/printk.h b/include/linux/printk.h
index a6298b27ac99..2d154b13d6cc 100644
--- a/include/linux/printk.h
+++ b/include/linux/printk.h
@@ -456,11 +456,17 @@ static inline void print_hex_dump_bytes(const char *prefix_str, int prefix_type,
 			     groupsize, buf, len, ascii)	\
 	dynamic_hex_dump(prefix_str, prefix_type, rowsize,	\
 			 groupsize, buf, len, ascii)
-#else
+#elif defined(DEBUG)
 #define print_hex_dump_debug(prefix_str, prefix_type, rowsize,		\
 			     groupsize, buf, len, ascii)		\
 	print_hex_dump(KERN_DEBUG, prefix_str, prefix_type, rowsize,	\
 		       groupsize, buf, len, ascii)
-#endif /* defined(CONFIG_DYNAMIC_DEBUG) */
+#else
+static inline void print_hex_dump_debug(const char *prefix_str, int prefix_type,
+					int rowsize, int groupsize,
+					const void *buf, size_t len, bool ascii)
+{
+}
+#endif
 
 #endif
-- 
2.4.3

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