The patch titled
dynamic debug: resurrect old pr_debug() semantics as pr_devel()
has been removed from the -mm tree. Its filename was
dynamic-debug-resurrect-old-pr_debug-semantics-as-pr_devel.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: dynamic debug: resurrect old pr_debug() semantics as pr_devel()
From: Michael Ellerman <michael@xxxxxxxxxxxxxx>
pr_debug() used to produce zero code unless DEBUG was #defined. This is
now no longer the case in practice[1].
There are places where it's useful to have debugging printks, but we don't
want them to generate any code in production kernels.
So add a new macro, pr_devel(), for _devel_opment, to provide the old
semantics, ie. if the programmer doesn't explicitly enable debugging, no
code is produced.
[1]: You can turn CONFIG_DYNAMIC_DEBUG off, but it's enabled in at least
one distro kernel, so it's not really a solution.
Signed-off-by: Michael Ellerman <michael@xxxxxxxxxxxxxx>
Cc: Jason Baron <jbaron@xxxxxxxxxx>
Cc: Greg KH <greg@xxxxxxxxx>
Cc: Greg Banks <gnb@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/kernel.h | 9 +++++++++
1 file changed, 9 insertions(+)
diff -puN include/linux/kernel.h~dynamic-debug-resurrect-old-pr_debug-semantics-as-pr_devel include/linux/kernel.h
--- a/include/linux/kernel.h~dynamic-debug-resurrect-old-pr_debug-semantics-as-pr_devel
+++ a/include/linux/kernel.h
@@ -377,6 +377,15 @@ static inline char *pack_hex_byte(char *
#define pr_cont(fmt, ...) \
printk(KERN_CONT fmt, ##__VA_ARGS__)
+/* pr_devel() should produce zero code unless DEBUG is defined */
+#ifdef DEBUG
+#define pr_devel(fmt, ...) \
+ printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__)
+#else
+#define pr_devel(fmt, ...) \
+ ({ if (0) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__); 0; })
+#endif
+
/* If you are writing a driver, please use dev_dbg instead */
#if defined(DEBUG)
#define pr_debug(fmt, ...) \
_
Patches currently in -mm which might be from michael@xxxxxxxxxxxxxx are
origin.patch
linux-next.patch
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