linux-kernel - Re: [PATCH] binder: log transaction code on failure

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Message-ID: <CAH5fLghAiwkADXOpXgtq2GOdNUnE3k4T_+Q2XaH2=2HZW8c50Q@mail.gmail.com>
Date: Fri, 10 Jan 2025 13:11:32 +0100
From: Alice Ryhl <aliceryhl@...gle.com>
To: Carlos Llamas <cmllamas@...gle.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Arve Hjønnevåg <arve@...roid.com>, 
	Todd Kjos <tkjos@...roid.com>, Martijn Coenen <maco@...roid.com>, 
	Joel Fernandes <joel@...lfernandes.org>, Christian Brauner <brauner@...nel.org>, 
	Suren Baghdasaryan <surenb@...gle.com>, linux-kernel@...r.kernel.org, kernel-team@...roid.com, 
	Steven Moreland <smoreland@...gle.com>
Subject: Re: [PATCH] binder: log transaction code on failure

On Fri, Jan 10, 2025 at 1:05 AM Carlos Llamas <cmllamas@...gle.com> wrote:
>
> When a transaction fails, log the 'tr->code' to help indentify the
> problematic userspace call path. This additional information will
> simplify debugging efforts.
>
> Cc: Steven Moreland <smoreland@...gle.com>
> Signed-off-by: Carlos Llamas <cmllamas@...gle.com>
> ---
>  drivers/android/binder.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/android/binder.c b/drivers/android/binder.c
> index ef353ca13c35..cb4187a4e595 100644
> --- a/drivers/android/binder.c
> +++ b/drivers/android/binder.c
> @@ -3801,13 +3801,13 @@ static void binder_transaction(struct binder_proc *proc,
>         }
>
>         binder_debug(BINDER_DEBUG_FAILED_TRANSACTION,
> -                    "%d:%d transaction %s to %d:%d failed %d/%d/%d, size %lld-%lld line %d\n",
> +                    "%d:%d transaction %s to %d:%d failed %d/%d/%d, code %d size %lld-%lld line %d\n",

Shouldn't this by %u instead?

Alice