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SubjectRe: [PATCH] pstore/ftrace: add a kernel parameter to start pstore recording
On Thu, 10 Jun 2021 10:21:34 +0200
Uwe Kleine-König <u.kleine-koenig@pengutronix.de> wrote:

> 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.
>

Is this still needed? It's still in my internal patchwork, and I haven't
seen any responses.

-- Steve


> 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);
> }

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