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Date: Wed, 25 Apr 2012 22:29:24 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: linux-kernel@...r.kernel.org
Cc: Ingo Molnar <mingo@...e.hu>,
Andrew Morton <akpm@...ux-foundation.org>,
Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
Frederic Weisbecker <fweisbec@...il.com>
Subject: [PATCH 2/6][RFC] ftrace: Remove extra helper functions
From: Steven Rostedt <srostedt@...hat.com>
The ftrace_record_ip() and ftrace_alloc_dyn_node() were from the
time of the ftrace daemon. Although they were still used, they
still make things a bit more complex than necessary.
Move the code into the one function that uses it, and remove the
helper functions.
Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
---
kernel/trace/ftrace.c | 61 +++++++++++++++++++------------------------------
1 file changed, 24 insertions(+), 37 deletions(-)
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index 6a19e81..4e608f8 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -1520,35 +1520,6 @@ static void ftrace_hash_rec_enable(struct ftrace_ops *ops,
__ftrace_hash_rec_update(ops, filter_hash, 1);
}
-static struct dyn_ftrace *ftrace_alloc_dyn_node(unsigned long ip)
-{
- if (ftrace_pages->index == ftrace_pages->size) {
- /* We should have allocated enough */
- if (WARN_ON(!ftrace_pages->next))
- return NULL;
- ftrace_pages = ftrace_pages->next;
- }
-
- return &ftrace_pages->records[ftrace_pages->index++];
-}
-
-static struct dyn_ftrace *
-ftrace_record_ip(unsigned long ip)
-{
- struct dyn_ftrace *rec;
-
- if (ftrace_disabled)
- return NULL;
-
- rec = ftrace_alloc_dyn_node(ip);
- if (!rec)
- return NULL;
-
- rec->ip = ip;
-
- return rec;
-}
-
static void print_ip_ins(const char *fmt, unsigned char *p)
{
int i;
@@ -3715,7 +3686,9 @@ static int ftrace_process_locs(struct module *mod,
unsigned long *start,
unsigned long *end)
{
+ struct ftrace_page *start_pg;
struct ftrace_page *pg;
+ struct dyn_ftrace *rec;
unsigned long count;
unsigned long *p;
unsigned long addr;
@@ -3730,8 +3703,8 @@ static int ftrace_process_locs(struct module *mod,
sort(start, count, sizeof(*start),
ftrace_cmp_ips, ftrace_swap_ips);
- pg = ftrace_allocate_pages(count);
- if (!pg)
+ start_pg = ftrace_allocate_pages(count);
+ if (!start_pg)
return -ENOMEM;
mutex_lock(&ftrace_lock);
@@ -3744,7 +3717,7 @@ static int ftrace_process_locs(struct module *mod,
if (!mod) {
WARN_ON(ftrace_pages || ftrace_pages_start);
/* First initialization */
- ftrace_pages = ftrace_pages_start = pg;
+ ftrace_pages = ftrace_pages_start = start_pg;
} else {
if (!ftrace_pages)
goto out;
@@ -3755,11 +3728,11 @@ static int ftrace_process_locs(struct module *mod,
ftrace_pages = ftrace_pages->next;
}
- ftrace_pages->next = pg;
- ftrace_pages = pg;
+ ftrace_pages->next = start_pg;
}
p = start;
+ pg = start_pg;
while (p < end) {
addr = ftrace_call_adjust(*p++);
/*
@@ -3770,12 +3743,26 @@ static int ftrace_process_locs(struct module *mod,
*/
if (!addr)
continue;
- if (!ftrace_record_ip(addr))
- break;
+
+ if (pg->index == pg->size) {
+ /* We should have allocated enough */
+ if (WARN_ON(!pg->next))
+ break;
+ pg = pg->next;
+ }
+
+ rec = &pg->records[pg->index++];
+ rec->ip = addr;
}
+ /* We should have used all pages */
+ WARN_ON(pg->next);
+
+ /* Assign the last page to ftrace_pages */
+ ftrace_pages = pg;
+
/* These new locations need to be initialized */
- ftrace_new_pgs = pg;
+ ftrace_new_pgs = start_pg;
/*
* We only need to disable interrupts on start up
--
1.7.9.5
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