linux-kernel - Re: [PATCH v10 14/27] vsprintf: add new `%pA` format specifier

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Message-ID: <YzMQCwxYr3rMxa5U@kroah.com>
Date:   Tue, 27 Sep 2022 17:00:27 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Miguel Ojeda <ojeda@...nel.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, patches@...ts.linux.dev,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Gary Guo <gary@...yguo.net>, Kees Cook <keescook@...omium.org>,
        Petr Mladek <pmladek@...e.com>,
        Alex Gaynor <alex.gaynor@...il.com>,
        Wedson Almeida Filho <wedsonaf@...gle.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Jonathan Corbet <corbet@....net>, linux-doc@...r.kernel.org
Subject: Re: [PATCH v10 14/27] vsprintf: add new `%pA` format specifier

On Tue, Sep 27, 2022 at 03:14:45PM +0200, Miguel Ojeda wrote:
> From: Gary Guo <gary@...yguo.net>
> 
> This patch adds a format specifier `%pA` to `vsprintf` which formats
> a pointer as `core::fmt::Arguments`. Doing so allows us to directly
> format to the internal buffer of `printf`, so we do not have to use
> a temporary buffer on the stack to pre-assemble the message on
> the Rust side.
> 
> This specifier is intended only to be used from Rust and not for C, so
> `checkpatch.pl` is intentionally unchanged to catch any misuse.
> 
> Reviewed-by: Kees Cook <keescook@...omium.org>
> Acked-by: Petr Mladek <pmladek@...e.com>
> Co-developed-by: Alex Gaynor <alex.gaynor@...il.com>
> Signed-off-by: Alex Gaynor <alex.gaynor@...il.com>
> Co-developed-by: Wedson Almeida Filho <wedsonaf@...gle.com>
> Signed-off-by: Wedson Almeida Filho <wedsonaf@...gle.com>
> Signed-off-by: Gary Guo <gary@...yguo.net>
> Co-developed-by: Miguel Ojeda <ojeda@...nel.org>
> Signed-off-by: Miguel Ojeda <ojeda@...nel.org>
> ---
>  Documentation/core-api/printk-formats.rst | 10 ++++++++++
>  lib/vsprintf.c                            | 13 +++++++++++++
>  2 files changed, 23 insertions(+)

Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>