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-rw-r--r--lib/Kconfig.debug8
-rw-r--r--lib/dynamic_debug.c42
2 files changed, 7 insertions, 43 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 1b4afd2e6ca..e85d549b6ea 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -482,6 +482,7 @@ config PROVE_LOCKING
select DEBUG_SPINLOCK
select DEBUG_MUTEXES
select DEBUG_LOCK_ALLOC
+ select TRACE_IRQFLAGS
default n
help
This feature enables the kernel to prove that all locking
@@ -579,11 +580,10 @@ config DEBUG_LOCKDEP
of more runtime overhead.
config TRACE_IRQFLAGS
- depends on DEBUG_KERNEL
bool
- default y
- depends on TRACE_IRQFLAGS_SUPPORT
- depends on PROVE_LOCKING
+ help
+ Enables hooks to interrupt enabling and disabling for
+ either tracing or lock debugging.
config DEBUG_SPINLOCK_SLEEP
bool "Spinlock debugging: sleep-inside-spinlock checking"
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 02afc253372..e925c7b960f 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -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;
@@ -88,26 +80,6 @@ static char *ddebug_describe_flags(struct _ddebug *dp, char *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
* the user which ddebug's were changed, or whether none
@@ -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