Messages in this thread Patch in this message | | | From | Uwe Kleine-König <> | Subject | [PATCH] pstore/ftrace: add a kernel parameter to start pstore recording | Date | Thu, 10 Jun 2021 10:21:34 +0200 |
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With this knob you can enable pstore recording early enough to debug hangs happening during the boot process before userspace is up enough to enable it via sysfs.
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> --- fs/pstore/ftrace.c | 13 +++++++++++++ 1 file changed, 13 insertions(+)
diff --git a/fs/pstore/ftrace.c b/fs/pstore/ftrace.c index 5939595f0115..92d35ee83c95 100644 --- a/fs/pstore/ftrace.c +++ b/fs/pstore/ftrace.c @@ -117,13 +117,26 @@ static const struct file_operations pstore_knob_fops = { static struct dentry *pstore_ftrace_dir; +static unsigned int record_ftrace_init; +module_param(record_ftrace_init, uint, 0400); + void pstore_register_ftrace(void) { + int ret; + if (!psinfo->write) return; pstore_ftrace_dir = debugfs_create_dir("pstore", NULL); + if (record_ftrace_init) { + ret = register_ftrace_function(&pstore_ftrace_ops); + if (ret) + return; + + pstore_ftrace_enabled = 1; + } + debugfs_create_file("record_ftrace", 0600, pstore_ftrace_dir, NULL, &pstore_knob_fops); } -- 2.29.2
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