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SubjectRe: [RFC PATCH 2/3] Generic Trace Setup and Control (GTSC) code
* Tom Zanussi (zanussi@us.ibm.com) wrote:
> The Generic Tracing and Control Interface (GTSC) code.
>
> Signed-off-by: Tom Zanussi <zanussi@us.ibm.com>
> Signed-off-by: David Wilder <dwilder@us.ibm.com>
> ---
> include/linux/gtsc.h | 104 +++++++++
> lib/Kconfig | 10
> lib/Makefile | 2
> lib/gtsc.c | 558 +++++++++++++++++++++++++++++++++++++++++++++++++++
> 4 files changed, 674 insertions(+)
>
....
> +static ssize_t reset_consumed_write(struct file *filp,
> + const char __user *buffer,
> + size_t count,
> + loff_t *ppos)
> +{
> + struct trace_info *trace = filp->private_data;
> +
> + relay_reset_consumed(trace->rchan);
> +
> + return count;
> +}
> +
> +struct file_operations reset_consumed_fops = {
> + .owner = THIS_MODULE,
> + .open = reset_consumed_open,
> + .write = reset_consumed_write
> +};
> +

Quoting the header of relay_reset_consumed:

+ * NOTE: Care should be taken that the channel isn't actually
+ * being used by anything when this call is made.

I can imagine relay saying "locking is not my problem", while GTSC
whistle and looks away... ;)


--
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68
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