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jump label: Convert dynamic debug to use jump labels

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Convert the 'dynamic debug' infrastructure to use jump labels.

Signed-off-by: Jason Baron <jbaron@redhat.com>
LKML-Reference: <b77627358cea3e27d7be4386f45f66219afb8452.1284733808.git.jbaron@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Jason Baron 2010-09-17 11:09:17 -04:00 • committed by Steven Rostedt
parent 8f7b50c514
commit 52159d98be
5 changed files with 26 additions and 132 deletions
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42
lib/dynamic_debug.c
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@ -26,19 +26,11 @@
#include <linux/dynamic_debug.h>
#include <linux/debugfs.h>
#include <linux/slab.h>
#include <linux/jump_label.h>
extern struct _ddebug __start___verbose[];
extern struct _ddebug __stop___verbose[];
/* dynamic_debug_enabled, and dynamic_debug_enabled2 are bitmasks in which
* bit n is set to 1 if any modname hashes into the bucket n, 0 otherwise. They
* use independent hash functions, to reduce the chance of false positives.
*/
long long dynamic_debug_enabled;
EXPORT_SYMBOL_GPL(dynamic_debug_enabled);
long long dynamic_debug_enabled2;
EXPORT_SYMBOL_GPL(dynamic_debug_enabled2);
struct ddebug_table {
struct list_head link;
char *mod_name;
@ -87,26 +79,6 @@ static char *ddebug_describe_flags(struct _ddebug *dp, char *buf,
return buf;
}
/*
* must be called with ddebug_lock held
*/
static int disabled_hash(char hash, bool first_table)
{
struct ddebug_table *dt;
char table_hash_value;
list_for_each_entry(dt, &ddebug_tables, link) {
if (first_table)
table_hash_value = dt->ddebugs->primary_hash;
else
table_hash_value = dt->ddebugs->secondary_hash;
if (dt->num_enabled && (hash == table_hash_value))
return 0;
}
return 1;
}
/*
* Search the tables for _ddebug's which match the given
* `query' and apply the `flags' and `mask' to them. Tells
@ -170,17 +142,9 @@ static void ddebug_change(const struct ddebug_query *query,
dt->num_enabled++;
dp->flags = newflags;
if (newflags) {
dynamic_debug_enabled |=
(1LL << dp->primary_hash);
dynamic_debug_enabled2 |=
(1LL << dp->secondary_hash);
enable_jump_label(&dp->enabled);
} else {
if (disabled_hash(dp->primary_hash, true))
dynamic_debug_enabled &=
~(1LL << dp->primary_hash);
if (disabled_hash(dp->secondary_hash, false))
dynamic_debug_enabled2 &=
~(1LL << dp->secondary_hash);
disable_jump_label(&dp->enabled);
}
if (verbose)
printk(KERN_INFO