linux-kernel - [RFC PATCH 05/10] dyndbg: avoid _ddebug.site in ddebug_condense

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Message-ID: <20231012194834.3288085-6-jim.cromie@gmail.com>
Date:   Thu, 12 Oct 2023 13:48:29 -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 05/10] dyndbg: avoid _ddebug.site in ddebug_condense_sites

Modify the for-loop in ddebug_condense_sites() to walk thru both
vectors: descs, sites in parallel.

This requires a 2nd set of cursor variables (*_ds) that mark the
start-of-range in the sites vector for the intervals to be
dd_store_range()d.  So also rename the old cursors (*_dd) for better
consistency and readability.

This is a partial step.  It still uses the desc_*() macros to provide
the values, and the macros use the site pointer.  Next, we replace the
macros with site_*(), passing the *_ds vars.

Signed-off-by: Jim Cromie <jim.cromie@...il.com>
---
 lib/dynamic_debug.c | 39 ++++++++++++++++++++++++---------------
 1 file changed, 24 insertions(+), 15 deletions(-)

diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 3dc17922a1d1..563d373224ba 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -1426,32 +1426,41 @@ static void dd_store_range(struct maple_tree *mt, const struct _ddebug *start,
 		v4pr_info("  ok %s at %lx\n", val, first);
 }
 
+
 static void ddebug_condense_sites(struct _ddebug_info *di)
 {
-	struct _ddebug *cur, *funcp, *filep, *modp;
+	struct _ddebug_site *cur_ds, *func_ds, *file_ds, *mod_ds;
+	struct _ddebug      *cur_dd, *func_dd, *file_dd, *mod_dd;
 	int i;
 
-	funcp = filep = modp = di->descs;
-	for_each_boxed_vector(di, descs, num_descs, i, cur) {
+	cur_dd = func_dd = file_dd = mod_dd = di->descs;
+	cur_ds = func_ds = file_ds = mod_ds = di->sites;
+	i = 0;
+	for (; i < di->num_descs; i++, cur_dd++, cur_ds++) {
+
+		BUG_ON(site_function(cur_ds) != desc_function(cur_dd));
 
-		if (!strcmp(desc_function(cur), desc_function(funcp)))
+		if (!strcmp(desc_function(cur_dd), desc_function(func_dd)))
 			continue;
-		dd_store_range(&mt_funcs, funcp, cur, "func", desc_function(funcp));
-		funcp = cur;
+		dd_store_range(&mt_funcs, func_dd, cur_dd, "func", desc_function(func_dd));
+		func_dd = cur_dd;
+		func_ds = cur_ds;
 
-		if (!strcmp(desc_filename(cur), desc_filename(filep)))
+		if (!strcmp(desc_filename(cur_dd), desc_filename(file_dd)))
 			continue;
-		dd_store_range(&mt_files, filep, cur, "file", desc_filename(filep));
-		filep = cur;
+		dd_store_range(&mt_files, file_dd, cur_dd, "file", desc_filename(file_dd));
+		file_dd = cur_dd;
+		file_ds = cur_ds;
 
-		if (!strcmp(desc_modname(cur), desc_modname(modp)))
+		if (!strcmp(desc_modname(cur_dd), desc_modname(mod_dd)))
 			continue;
-		dd_store_range(&mt_mods, modp, cur, "mod", desc_modname(modp));
-		modp = cur;
+		dd_store_range(&mt_mods, mod_dd, cur_dd, "mod", desc_modname(mod_dd));
+		mod_dd = cur_dd;
+		mod_ds = cur_ds;
 	}
-	dd_store_range(&mt_funcs, funcp, cur, "func:", desc_function(funcp));
-	dd_store_range(&mt_files, filep, cur, "file:", desc_filename(filep));
-	dd_store_range(&mt_mods, modp, cur, "mod:", desc_modname(modp));
+	dd_store_range(&mt_funcs, func_dd, cur_dd, "func:", desc_function(func_dd));
+	dd_store_range(&mt_files, file_dd, cur_dd, "file:", desc_filename(file_dd));
+	dd_store_range(&mt_mods, mod_dd, cur_dd, "mod:", desc_modname(mod_dd));
 }
 
 /*
-- 
2.41.0