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ftrace: Remove record freezing

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Remove record freezing. Because kprobes never puts probe on
ftrace's mcount call anymore, it doesn't need ftrace to check
whether kprobes on it.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: systemtap <systemtap@sources.redhat.com>
Cc: DLE <dle-develop@lists.sourceforge.net>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: przemyslaw@pawelczyk.it
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20100202214925.4694.73469.stgit@dhcp-100-2-132.bos.redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Masami Hiramatsu 2010-02-02 16:49:25 -05:00 committed by Ingo Molnar
parent 4554dbcb85
commit f24bb999d2
2 changed files with 0 additions and 40 deletions
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1
include/linux/ftrace.h
View File

@ -143,7 +143,6 @@ enum {
FTRACE_FL_ENABLED = (1 << 3),
FTRACE_FL_NOTRACE = (1 << 4),
FTRACE_FL_CONVERTED = (1 << 5),
FTRACE_FL_FROZEN = (1 << 6),
};
struct dyn_ftrace {

39
kernel/trace/ftrace.c
View File

@ -22,7 +22,6 @@
#include <linux/hardirq.h>
#include <linux/kthread.h>
#include <linux/uaccess.h>
#include <linux/kprobes.h>
#include <linux/ftrace.h>
#include <linux/sysctl.h>
#include <linux/ctype.h>
@ -898,36 +897,6 @@ static struct dyn_ftrace *ftrace_free_records;
} \
}
#ifdef CONFIG_KPROBES
static int frozen_record_count;
static inline void freeze_record(struct dyn_ftrace *rec)
{
if (!(rec->flags & FTRACE_FL_FROZEN)) {
rec->flags |= FTRACE_FL_FROZEN;
frozen_record_count++;
}
}
static inline void unfreeze_record(struct dyn_ftrace *rec)
{
if (rec->flags & FTRACE_FL_FROZEN) {
rec->flags &= ~FTRACE_FL_FROZEN;
frozen_record_count--;
}
}
static inline int record_frozen(struct dyn_ftrace *rec)
{
return rec->flags & FTRACE_FL_FROZEN;
}
#else
# define freeze_record(rec) ({ 0; })
# define unfreeze_record(rec) ({ 0; })
# define record_frozen(rec) ({ 0; })
#endif /* CONFIG_KPROBES */
static void ftrace_free_rec(struct dyn_ftrace *rec)
{
rec->freelist = ftrace_free_records;
@ -1091,14 +1060,6 @@ static void ftrace_replace_code(int enable)
!(rec->flags & FTRACE_FL_CONVERTED))
continue;
/* ignore updates to this record's mcount site */
if (get_kprobe((void *)rec->ip)) {
freeze_record(rec);
continue;
} else {
unfreeze_record(rec);
}
failed = __ftrace_replace_code(rec, enable);
if (failed) {
rec->flags |= FTRACE_FL_FAILED;