Fix build errors on kernel/trace/ftrace.c:
‘ops_references_rec’ defined but not used.
Fixes: 53cd885bc5c3 ("ftrace: Allow IPMODIFY and DIRECT ops on the same function")
Signed-off-by: Wang Jingjin <[email protected]>
---
kernel/trace/ftrace.c | 30 +++++++++++++++---------------
1 file changed, 15 insertions(+), 15 deletions(-)
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index bc921a3f7ea8..16d3d3884e17 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -1861,8 +1861,6 @@ static void ftrace_hash_rec_enable_modify(struct ftrace_ops *ops,
ftrace_hash_rec_update_modify(ops, filter_hash, 1);
}
-static bool ops_references_ip(struct ftrace_ops *ops, unsigned long ip);
-
/*
* Try to update IPMODIFY flag on each ftrace_rec. Return 0 if it is OK
* or no-needed to update, -EBUSY if it detects a conflict of the flag
@@ -3108,6 +3106,7 @@ static inline int ops_traces_mod(struct ftrace_ops *ops)
ftrace_hash_empty(ops->func_hash->notrace_hash);
}
+#if defined(CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS) || defined(CONFIG_MODULES)
/*
* Check if the current ops references the given ip.
*
@@ -3137,19 +3136,7 @@ ops_references_ip(struct ftrace_ops *ops, unsigned long ip)
return true;
}
-
-/*
- * Check if the current ops references the record.
- *
- * If the ops traces all functions, then it was already accounted for.
- * If the ops does not trace the current record function, skip it.
- * If the ops ignores the function via notrace filter, skip it.
- */
-static bool
-ops_references_rec(struct ftrace_ops *ops, struct dyn_ftrace *rec)
-{
- return ops_references_ip(ops, rec->ip);
-}
+#endif
static int ftrace_update_code(struct module *mod, struct ftrace_page *new_pgs)
{
@@ -6818,6 +6805,19 @@ static int ftrace_get_trampoline_kallsym(unsigned int symnum,
static LIST_HEAD(ftrace_mod_maps);
+/*
+ * Check if the current ops references the record.
+ *
+ * If the ops traces all functions, then it was already accounted for.
+ * If the ops does not trace the current record function, skip it.
+ * If the ops ignores the function via notrace filter, skip it.
+ */
+static bool
+ops_references_rec(struct ftrace_ops *ops, struct dyn_ftrace *rec)
+{
+ return ops_references_ip(ops, rec->ip);
+}
+
static int referenced_filters(struct dyn_ftrace *rec)
{
struct ftrace_ops *ops;
--
2.25.1
On Tue, 26 Jul 2022 19:35:38 +0800
WangJingjin <[email protected]> wrote:
> Fix build errors on kernel/trace/ftrace.c:
> ‘ops_references_rec’ defined but not used.
>
> Fixes: 53cd885bc5c3 ("ftrace: Allow IPMODIFY and DIRECT ops on the same function")
> Signed-off-by: Wang Jingjin <[email protected]>
> ---
> kernel/trace/ftrace.c | 30 +++++++++++++++---------------
> 1 file changed, 15 insertions(+), 15 deletions(-)
>
> diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
> index bc921a3f7ea8..16d3d3884e17 100644
> --- a/kernel/trace/ftrace.c
> +++ b/kernel/trace/ftrace.c
> @@ -1861,8 +1861,6 @@ static void ftrace_hash_rec_enable_modify(struct ftrace_ops *ops,
> ftrace_hash_rec_update_modify(ops, filter_hash, 1);
> }
>
> -static bool ops_references_ip(struct ftrace_ops *ops, unsigned long ip);
> -
> /*
> * Try to update IPMODIFY flag on each ftrace_rec. Return 0 if it is OK
> * or no-needed to update, -EBUSY if it detects a conflict of the flag
> @@ -3108,6 +3106,7 @@ static inline int ops_traces_mod(struct ftrace_ops *ops)
> ftrace_hash_empty(ops->func_hash->notrace_hash);
> }
>
> +#if defined(CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS) || defined(CONFIG_MODULES)
Honesly, this block needs to be moved down to closer to where it is
first used (just above the #ifdef CONFIG_MODULES).
> /*
> * Check if the current ops references the given ip.
> *
> @@ -3137,19 +3136,7 @@ ops_references_ip(struct ftrace_ops *ops, unsigned long ip)
>
> return true;
> }
> -
> -/*
> - * Check if the current ops references the record.
> - *
> - * If the ops traces all functions, then it was already accounted for.
> - * If the ops does not trace the current record function, skip it.
> - * If the ops ignores the function via notrace filter, skip it.
> - */
> -static bool
> -ops_references_rec(struct ftrace_ops *ops, struct dyn_ftrace *rec)
> -{
> - return ops_references_ip(ops, rec->ip);
> -}
> +#endif
>
> static int ftrace_update_code(struct module *mod, struct ftrace_page *new_pgs)
> {
> @@ -6818,6 +6805,19 @@ static int ftrace_get_trampoline_kallsym(unsigned int symnum,
>
> static LIST_HEAD(ftrace_mod_maps);
>
> +/*
> + * Check if the current ops references the record.
> + *
> + * If the ops traces all functions, then it was already accounted for.
> + * If the ops does not trace the current record function, skip it.
> + * If the ops ignores the function via notrace filter, skip it.
> + */
> +static bool
> +ops_references_rec(struct ftrace_ops *ops, struct dyn_ftrace *rec)
> +{
> + return ops_references_ip(ops, rec->ip);
> +}
And we should just nuke this function, and call the ops_references_ip()
directly, as it is only used in one location.
static int referenced_filters(struct dyn_ftrace *rec)
{
struct ftrace_ops *ops;
int cnt = 0;
for (ops = ftrace_ops_list; ops != &ftrace_list_end; ops = ops->next) {
- if (ops_references_rec(ops, rec)) {
+ if (ops_references_ip(ops, rec->ip)) {
if (WARN_ON_ONCE(ops->flags & FTRACE_OPS_FL_DIRECT))
continue;
if (WARN_ON_ONCE(ops->flags & FTRACE_OPS_FL_IPMODIFY))
-- Steve
> +
> static int referenced_filters(struct dyn_ftrace *rec)
> {
> struct ftrace_ops *ops;
> --
> 2.25.1
Fix build errors on kernel/trace/ftrace.c:
‘ops_references_rec’ defined but not used.
Fixes: 53cd885bc5c3 ("ftrace: Allow IPMODIFY and DIRECT ops on the same function")
Signed-off-by: Wang Jingjin <[email protected]>
---
v2:
- delete function - ops_references_rec
- move function - ops_references_ip above the "#ifdef CONFIG_MODULES"
kernel/trace/ftrace.c | 79 ++++++++++++++++++-------------------------
1 file changed, 33 insertions(+), 46 deletions(-)
diff --git a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
index bc921a3f7ea8..aa5e29e40da8 100644
--- a/kernel/trace/ftrace.c
+++ b/kernel/trace/ftrace.c
@@ -1861,8 +1861,6 @@ static void ftrace_hash_rec_enable_modify(struct ftrace_ops *ops,
ftrace_hash_rec_update_modify(ops, filter_hash, 1);
}
-static bool ops_references_ip(struct ftrace_ops *ops, unsigned long ip);
-
/*
* Try to update IPMODIFY flag on each ftrace_rec. Return 0 if it is OK
* or no-needed to update, -EBUSY if it detects a conflict of the flag
@@ -3108,49 +3106,6 @@ static inline int ops_traces_mod(struct ftrace_ops *ops)
ftrace_hash_empty(ops->func_hash->notrace_hash);
}
-/*
- * Check if the current ops references the given ip.
- *
- * If the ops traces all functions, then it was already accounted for.
- * If the ops does not trace the current record function, skip it.
- * If the ops ignores the function via notrace filter, skip it.
- */
-static bool
-ops_references_ip(struct ftrace_ops *ops, unsigned long ip)
-{
- /* If ops isn't enabled, ignore it */
- if (!(ops->flags & FTRACE_OPS_FL_ENABLED))
- return false;
-
- /* If ops traces all then it includes this function */
- if (ops_traces_mod(ops))
- return true;
-
- /* The function must be in the filter */
- if (!ftrace_hash_empty(ops->func_hash->filter_hash) &&
- !__ftrace_lookup_ip(ops->func_hash->filter_hash, ip))
- return false;
-
- /* If in notrace hash, we ignore it too */
- if (ftrace_lookup_ip(ops->func_hash->notrace_hash, ip))
- return false;
-
- return true;
-}
-
-/*
- * Check if the current ops references the record.
- *
- * If the ops traces all functions, then it was already accounted for.
- * If the ops does not trace the current record function, skip it.
- * If the ops ignores the function via notrace filter, skip it.
- */
-static bool
-ops_references_rec(struct ftrace_ops *ops, struct dyn_ftrace *rec)
-{
- return ops_references_ip(ops, rec->ip);
-}
-
static int ftrace_update_code(struct module *mod, struct ftrace_page *new_pgs)
{
bool init_nop = ftrace_need_init_nop();
@@ -6812,6 +6767,38 @@ static int ftrace_get_trampoline_kallsym(unsigned int symnum,
return -ERANGE;
}
+#if defined(CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS) || defined(CONFIG_MODULES)
+/*
+ * Check if the current ops references the given ip.
+ *
+ * If the ops traces all functions, then it was already accounted for.
+ * If the ops does not trace the current record function, skip it.
+ * If the ops ignores the function via notrace filter, skip it.
+ */
+static bool
+ops_references_ip(struct ftrace_ops *ops, unsigned long ip)
+{
+ /* If ops isn't enabled, ignore it */
+ if (!(ops->flags & FTRACE_OPS_FL_ENABLED))
+ return false;
+
+ /* If ops traces all then it includes this function */
+ if (ops_traces_mod(ops))
+ return true;
+
+ /* The function must be in the filter */
+ if (!ftrace_hash_empty(ops->func_hash->filter_hash) &&
+ !__ftrace_lookup_ip(ops->func_hash->filter_hash, ip))
+ return false;
+
+ /* If in notrace hash, we ignore it too */
+ if (ftrace_lookup_ip(ops->func_hash->notrace_hash, ip))
+ return false;
+
+ return true;
+}
+#endif
+
#ifdef CONFIG_MODULES
#define next_to_ftrace_page(p) container_of(p, struct ftrace_page, next)
@@ -6824,7 +6811,7 @@ static int referenced_filters(struct dyn_ftrace *rec)
int cnt = 0;
for (ops = ftrace_ops_list; ops != &ftrace_list_end; ops = ops->next) {
- if (ops_references_rec(ops, rec)) {
+ if (ops_references_ip(ops, rec->ip)) {
if (WARN_ON_ONCE(ops->flags & FTRACE_OPS_FL_DIRECT))
continue;
if (WARN_ON_ONCE(ops->flags & FTRACE_OPS_FL_IPMODIFY))
--
2.25.1