linux-kernel - [RFC PATCH 08/10] dyndbg: drop

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Message-ID: <20231012194834.3288085-9-jim.cromie@gmail.com>
Date:   Thu, 12 Oct 2023 13:48:32 -0600
From:   Jim Cromie <jim.cromie@...il.com>
To:     linux-kernel@...r.kernel.org, jbaron@...mai.com,
        gregkh@...uxfoundation.org
Cc:     david@...hat.com, lb@...ihalf.com, linux@...musvillemoes.dk,
        joe@...ches.com, mcgrof@...nel.org, Liam.Howlett@...cle.com,
        linux-mm@...ck.org, Jim Cromie <jim.cromie@...il.com>
Subject: [RFC PATCH 08/10] dyndbg: drop _ddebug.site member

drop site ptr, and rely upon the maple-tree intervals loaded by
ddebug_condense_sites().

In DEFINE_DYNAMIC_DEBUG_METADATA_CLS(), which creates a pair of
_ddebug & _ddebug_site structs, add '__used' to the latter, because it
is no longer linked from the former, and then also to the former, so
they both have the same number of entries.  Replace the BUG_ON with a
pr_warn that shows the size of the mismatch.

TODO: sort out where the extra records are coming from.

Signed-off-by: Jim Cromie <jim.cromie@...il.com>
---
 include/linux/dynamic_debug.h | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/include/linux/dynamic_debug.h b/include/linux/dynamic_debug.h
index 5206a2cfdb37..406b30d8eb98 100644
--- a/include/linux/dynamic_debug.h
+++ b/include/linux/dynamic_debug.h
@@ -27,7 +27,6 @@ struct _ddebug_site {
 };
 
 struct _ddebug {
-	struct _ddebug_site *site;
 	const char *format;
 	unsigned int lineno:18;
 #define CLS_BITS 6
@@ -228,13 +227,12 @@ void __dynamic_ibdev_dbg(struct _ddebug *descriptor,
 	._filename = __FILE__
 
 #define DEFINE_DYNAMIC_DEBUG_METADATA_CLS(name, cls, fmt)	\
-	static struct _ddebug_site  __aligned(8)		\
+	static struct _ddebug_site  __used __aligned(8) 	\
 	__section("__dyndbg_sites") name ##_site = {		\
 		DYNAMIC_DEBUG_SITE_INIT(),			\
 	};							\
-	static struct _ddebug  __aligned(8)			\
+	static struct _ddebug  __used __aligned(8)		\
 	__section("__dyndbg") name = {				\
-		.site = &(name ##_site),			\
 		.format = (fmt),				\
 		.lineno = __LINE__,				\
 		.flags = _DPRINTK_FLAGS_DEFAULT,		\
-- 
2.41.0