Re: [PATCH v2 0/7] rust_binder : Implement dynamic debug logging mask

[Jahnavi Nitheesha Mandava <jahnavimn@google.com>]

On Fri, Jul 10, 2026 at 8:31 PM Greg Kroah-Hartman
<gregkh@linuxfoundation.org> wrote:
>
> On Fri, Jul 10, 2026 at 02:32:51PM +0000, Jahnavi MN via B4 Relay wrote:
> > When a user-space application sends malformed data or makes a
> > lifecycle mistake, the driver rejects it with a generic error code
> > (like -EINVAL). Without internal logs, the driver acts as a
> > "black box," forcing developers to guess which check failed.
> >
> > In the legacy C Binder driver, this issue is solved using a dynamic
> > debug_mask module parameter that toggles verbose logs for specific
> > subsystems. This series brings the same critical capability to the
> > Rust Binder driver to provide developers with clear, real-time
> > feedback.
> >
> > Instead of rebuilds, reboots, or guessing:
> > - Developers can enable logs instantly on a running device by writing to
> >   `/sys/module/rust_binder/parameters/debug_mask`.
> > - It prints the exact reason for failures (such as alignment errors,
> >   mismatched call stacks, or invalid handle references) directly into
> >   `dmesg`, reducing debugging time from hours to seconds.
> > - It protects system logs by keeping logging off by default and only
> >   enabling it when developers are actively troubleshooting.
> >
> > Based on top of:
> > https://lore.kernel.org/rust-for-linux/20260707-upgrade-poll-v6-0-4b8fae7bf1d9@google.com/
> >
> > Signed-off-by: Jahnavi MN <jahnavimn@google.com>
>
> Patches 5 and 7 did not apply to my tree, can you rebase against the
> char-misc-testing branch and send just those?  Other ones are now all
> queued up, nice work!
>
> thanks,
>
> greg k-h

Hi Greg,

Thanks! I will rebase and resubmit only patches 5 and 7 as a new
version (v3) of this series shortly.

Regarding the feedback I received on Patch 1 (using the BIT macro
and Atomic<u32>), since Patch 1 is already queued, I will send those
cleanups as a separate, follow-up patch. Does that sound good?

Thanks,
Jahnavi