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Diffstat (limited to 'kernel/trace/trace.c')
-rw-r--r--kernel/trace/trace.c86
1 files changed, 69 insertions, 17 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 3050892d1812..f4de111fa18f 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -185,6 +185,7 @@ static char bootup_tracer_buf[MAX_TRACER_SIZE] __initdata;
static char *default_bootup_tracer;
static bool allocate_snapshot;
+static bool snapshot_at_boot;
static int __init set_cmdline_ftrace(char *str)
{
@@ -230,12 +231,21 @@ static int __init boot_alloc_snapshot(char *str)
__setup("alloc_snapshot", boot_alloc_snapshot);
+static int __init boot_snapshot(char *str)
+{
+ snapshot_at_boot = true;
+ boot_alloc_snapshot(str);
+ return 1;
+}
+__setup("ftrace_boot_snapshot", boot_snapshot);
+
+
static char trace_boot_options_buf[MAX_TRACER_SIZE] __initdata;
static int __init set_trace_boot_options(char *str)
{
strlcpy(trace_boot_options_buf, str, MAX_TRACER_SIZE);
- return 0;
+ return 1;
}
__setup("trace_options=", set_trace_boot_options);
@@ -246,7 +256,7 @@ static int __init set_trace_boot_clock(char *str)
{
strlcpy(trace_boot_clock_buf, str, MAX_TRACER_SIZE);
trace_boot_clock = trace_boot_clock_buf;
- return 0;
+ return 1;
}
__setup("trace_clock=", set_trace_boot_clock);
@@ -3663,12 +3673,17 @@ static char *trace_iter_expand_format(struct trace_iterator *iter)
}
/* Returns true if the string is safe to dereference from an event */
-static bool trace_safe_str(struct trace_iterator *iter, const char *str)
+static bool trace_safe_str(struct trace_iterator *iter, const char *str,
+ bool star, int len)
{
unsigned long addr = (unsigned long)str;
struct trace_event *trace_event;
struct trace_event_call *event;
+ /* Ignore strings with no length */
+ if (star && !len)
+ return true;
+
/* OK if part of the event data */
if ((addr >= (unsigned long)iter->ent) &&
(addr < (unsigned long)iter->ent + iter->ent_size))
@@ -3854,7 +3869,7 @@ void trace_check_vprintf(struct trace_iterator *iter, const char *fmt,
* instead. See samples/trace_events/trace-events-sample.h
* for reference.
*/
- if (WARN_ONCE(!trace_safe_str(iter, str),
+ if (WARN_ONCE(!trace_safe_str(iter, str, star, len),
"fmt: '%s' current_buffer: '%s'",
fmt, show_buffer(&iter->seq))) {
int ret;
@@ -7725,7 +7740,7 @@ const struct file_operations trace_min_max_fops = {
struct err_info {
const char **errs; /* ptr to loc-specific array of err strings */
u8 type; /* index into errs -> specific err string */
- u8 pos; /* MAX_FILTER_STR_VAL = 256 */
+ u16 pos; /* caret position */
u64 ts;
};
@@ -7733,26 +7748,52 @@ struct tracing_log_err {
struct list_head list;
struct err_info info;
char loc[TRACING_LOG_LOC_MAX]; /* err location */
- char cmd[MAX_FILTER_STR_VAL]; /* what caused err */
+ char *cmd; /* what caused err */
};
static DEFINE_MUTEX(tracing_err_log_lock);
-static struct tracing_log_err *get_tracing_log_err(struct trace_array *tr)
+static struct tracing_log_err *alloc_tracing_log_err(int len)
+{
+ struct tracing_log_err *err;
+
+ err = kzalloc(sizeof(*err), GFP_KERNEL);
+ if (!err)
+ return ERR_PTR(-ENOMEM);
+
+ err->cmd = kzalloc(len, GFP_KERNEL);
+ if (!err->cmd) {
+ kfree(err);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ return err;
+}
+
+static void free_tracing_log_err(struct tracing_log_err *err)
+{
+ kfree(err->cmd);
+ kfree(err);
+}
+
+static struct tracing_log_err *get_tracing_log_err(struct trace_array *tr,
+ int len)
{
struct tracing_log_err *err;
if (tr->n_err_log_entries < TRACING_LOG_ERRS_MAX) {
- err = kzalloc(sizeof(*err), GFP_KERNEL);
- if (!err)
- err = ERR_PTR(-ENOMEM);
- else
+ err = alloc_tracing_log_err(len);
+ if (PTR_ERR(err) != -ENOMEM)
tr->n_err_log_entries++;
return err;
}
err = list_first_entry(&tr->err_log, struct tracing_log_err, list);
+ kfree(err->cmd);
+ err->cmd = kzalloc(len, GFP_KERNEL);
+ if (!err->cmd)
+ return ERR_PTR(-ENOMEM);
list_del(&err->list);
return err;
@@ -7813,22 +7854,25 @@ unsigned int err_pos(char *cmd, const char *str)
*/
void tracing_log_err(struct trace_array *tr,
const char *loc, const char *cmd,
- const char **errs, u8 type, u8 pos)
+ const char **errs, u8 type, u16 pos)
{
struct tracing_log_err *err;
+ int len = 0;
if (!tr)
tr = &global_trace;
+ len += sizeof(CMD_PREFIX) + 2 * sizeof("\n") + strlen(cmd) + 1;
+
mutex_lock(&tracing_err_log_lock);
- err = get_tracing_log_err(tr);
+ err = get_tracing_log_err(tr, len);
if (PTR_ERR(err) == -ENOMEM) {
mutex_unlock(&tracing_err_log_lock);
return;
}
snprintf(err->loc, TRACING_LOG_LOC_MAX, "%s: error: ", loc);
- snprintf(err->cmd, MAX_FILTER_STR_VAL,"\n" CMD_PREFIX "%s\n", cmd);
+ snprintf(err->cmd, len, "\n" CMD_PREFIX "%s\n", cmd);
err->info.errs = errs;
err->info.type = type;
@@ -7846,7 +7890,7 @@ static void clear_tracing_err_log(struct trace_array *tr)
mutex_lock(&tracing_err_log_lock);
list_for_each_entry_safe(err, next, &tr->err_log, list) {
list_del(&err->list);
- kfree(err);
+ free_tracing_log_err(err);
}
tr->n_err_log_entries = 0;
@@ -7874,9 +7918,9 @@ static void tracing_err_log_seq_stop(struct seq_file *m, void *v)
mutex_unlock(&tracing_err_log_lock);
}
-static void tracing_err_log_show_pos(struct seq_file *m, u8 pos)
+static void tracing_err_log_show_pos(struct seq_file *m, u16 pos)
{
- u8 i;
+ u16 i;
for (i = 0; i < sizeof(CMD_PREFIX) - 1; i++)
seq_putc(m, ' ');
@@ -10122,6 +10166,14 @@ out:
return ret;
}
+void __init ftrace_boot_snapshot(void)
+{
+ if (snapshot_at_boot) {
+ tracing_snapshot();
+ internal_trace_puts("** Boot snapshot taken **\n");
+ }
+}
+
void __init early_trace_init(void)
{
if (tracepoint_printk) {
generated by cgit (git 2.34.1) at 2025-06-04 19:45:17 +0000