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ftrace: fix updating of ftrace_update_cnt

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Hi Ingo/Steven,

Ftrace currently maintains an update count which includes false updates,
i.e, updates which failed. If anything, such failures should be tracked
by some separate variable, but this patch provides a minimal fix.

Signed-off-by: Abhishek Sagar <sagar.abhishek@gmail.com>
Cc: rostedt@goodmis.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Abhishek Sagar 2008-05-25 00:10:04 +05:30 • committed by Thomas Gleixner
parent ffdaa3582b
commit 492a7ea5bc
1 changed files with 5 additions and 3 deletions
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6
kernel/trace/ftrace.c
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@ -453,7 +453,7 @@ static void ftrace_shutdown_replenish(void)
ftrace_pages->next = (void *)get_zeroed_page(GFP_KERNEL); ftrace_pages->next = (void *)get_zeroed_page(GFP_KERNEL);
} }
static void static int
ftrace_code_disable(struct dyn_ftrace *rec) ftrace_code_disable(struct dyn_ftrace *rec)
{ {
unsigned long ip; unsigned long ip;
@ -469,7 +469,9 @@ ftrace_code_disable(struct dyn_ftrace *rec)
if (failed) { if (failed) {
rec->flags |= FTRACE_FL_FAILED; rec->flags |= FTRACE_FL_FAILED;
ftrace_free_rec(rec); ftrace_free_rec(rec);
return 0;
} }
return 1;
} }
static int __ftrace_modify_code(void *data) static int __ftrace_modify_code(void *data)
@ -617,7 +619,7 @@ static int __ftrace_update_code(void *ignore)
/* all CPUS are stopped, we are safe to modify code */ /* all CPUS are stopped, we are safe to modify code */
hlist_for_each_entry(p, t, &head, node) { hlist_for_each_entry(p, t, &head, node) {
ftrace_code_disable(p); if (ftrace_code_disable(p))
ftrace_update_cnt++; ftrace_update_cnt++;
} }