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ftrace: Add ftrace_rec_counter() macro to simplify the code 

The ftrace dynamic record has a flags element that also has a counter.
Instead of hard coding "rec->flags & ~FTRACE_FL_MASK" all over the
place. Use a macro instead.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (Red Hat) 2014-05-07 13:46:45 -04:00 committed by Steven Rostedt
parent cf2cb0b271
commit 0376bde11b
2 changed files with 8 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
include/linux/ftrace.h
View File

@ -328,6 +328,8 @@ enum {
#define FTRACE_FL_MASK (FTRACE_FL_MASKED_BITS << FTRACE_REF_MAX_SHIFT)
#define FTRACE_REF_MAX ((1UL << FTRACE_REF_MAX_SHIFT) - 1)
#define ftrace_rec_count(rec) ((rec)->flags & ~FTRACE_FL_MASK)
struct dyn_ftrace {
unsigned long ip; /* address of mcount call-site */
unsigned long flags;

12
kernel/trace/ftrace.c
View File

@ -1592,7 +1592,7 @@ static void __ftrace_hash_rec_update(struct ftrace_ops *ops,
if (inc) {
rec->flags++;
if (FTRACE_WARN_ON((rec->flags & ~FTRACE_FL_MASK) == FTRACE_REF_MAX))
if (FTRACE_WARN_ON(ftrace_rec_count(rec) == FTRACE_REF_MAX))
return;
/*
* If any ops wants regs saved for this function
@ -1601,7 +1601,7 @@ static void __ftrace_hash_rec_update(struct ftrace_ops *ops,
if (ops->flags & FTRACE_OPS_FL_SAVE_REGS)
rec->flags |= FTRACE_FL_REGS;
} else {
if (FTRACE_WARN_ON((rec->flags & ~FTRACE_FL_MASK) == 0))
if (FTRACE_WARN_ON(ftrace_rec_count(rec) == 0))
return;
rec->flags--;
/*
@ -1610,7 +1610,7 @@ static void __ftrace_hash_rec_update(struct ftrace_ops *ops,
* still any ops for this record that wants regs.
* If not, we can stop recording them.
*/
if ((rec->flags & ~FTRACE_FL_MASK) > 0 &&
if (ftrace_rec_count(rec) > 0 &&
rec->flags & FTRACE_FL_REGS &&
ops->flags & FTRACE_OPS_FL_SAVE_REGS) {
if (!test_rec_ops_needs_regs(rec))
@ -1700,7 +1700,7 @@ static int ftrace_check_record(struct dyn_ftrace *rec, int enable, int update)
* If we are disabling calls, then disable all records that
* are enabled.
*/
if (enable && (rec->flags & ~FTRACE_FL_MASK))
if (enable && ftrace_rec_count(rec))
flag = FTRACE_FL_ENABLED;
/*
@ -1746,7 +1746,7 @@ static int ftrace_check_record(struct dyn_ftrace *rec, int enable, int update)
if (update) {
/* If there's no more users, clear all flags */
if (!(rec->flags & ~FTRACE_FL_MASK))
if (!ftrace_rec_count(rec))
rec->flags = 0;
else
/* Just disable the record (keep REGS state) */
@ -2685,7 +2685,7 @@ static int t_show(struct seq_file *m, void *v)
seq_printf(m, "%ps", (void *)rec->ip);
if (iter->flags & FTRACE_ITER_ENABLED)
seq_printf(m, " (%ld)%s",
rec->flags & ~FTRACE_FL_MASK,
ftrace_rec_count(rec),
rec->flags & FTRACE_FL_REGS ? " R" : "");
seq_printf(m, "\n");