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tracing: Reset last_boot_info if ring buffer is reset

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Commit 32dc004252 ("tracing: Reset last-boot buffers when reading
out all cpu buffers") resets the last_boot_info when user read out
all data via trace_pipe* files. But it is not reset when user
resets the buffer from other files. (e.g. write `trace` file)

Reset it when the corresponding ring buffer is reset too.

Cc: stable@vger.kernel.org
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://patch.msgid.link/177071302364.2293046.17895165659153977720.stgit@mhiramat.tok.corp.google.com
Fixes: 32dc004252 ("tracing: Reset last-boot buffers when reading out all cpu buffers")
Signed-off-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
This commit is contained in:
Masami Hiramatsu (Google) 2026-02-10 17:43:43 +09:00 committed by Steven Rostedt (Google)
parent f844282dee
commit 804c4a2209
1 changed files with 6 additions and 0 deletions
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6
kernel/trace/trace.c
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@ -4127,6 +4127,8 @@ static int tracing_single_release_tr(struct inode *inode, struct file *file)
return single_release(inode, file);
}
static bool update_last_data_if_empty(struct trace_array *tr);
static int tracing_open(struct inode *inode, struct file *file)
{
struct trace_array *tr = inode->i_private;
@ -4151,6 +4153,8 @@ static int tracing_open(struct inode *inode, struct file *file)
tracing_reset_online_cpus(trace_buf);
else
tracing_reset_cpu(trace_buf, cpu);
update_last_data_if_empty(tr);
}
if (file->f_mode & FMODE_READ) {
@ -5215,6 +5219,7 @@ tracing_set_trace_read(struct file *filp, char __user *ubuf,
int tracer_init(struct tracer *t, struct trace_array *tr)
{
tracing_reset_online_cpus(&tr->array_buffer);
update_last_data_if_empty(tr);
return t->init(tr);
}
@ -7028,6 +7033,7 @@ int tracing_set_clock(struct trace_array *tr, const char *clockstr)
ring_buffer_set_clock(tr->snapshot_buffer.buffer, trace_clocks[i].func);
tracing_reset_online_cpus(&tr->snapshot_buffer);
#endif
update_last_data_if_empty(tr);
if (tr->scratch && !(tr->flags & TRACE_ARRAY_FL_LAST_BOOT)) {
struct trace_scratch *tscratch = tr->scratch;