linux-kernel - Re: [PATCH printk v1 07/10] console: add write

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Date:   Fri, 6 Aug 2021 14:18:05 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     John Ogness <john.ogness@...utronix.de>
Cc:     Petr Mladek <pmladek@...e.com>,
        Sergey Senozhatsky <senozhatsky@...omium.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Vitor Massaru Iha <vitor@...saru.org>,
        Sedat Dilek <sedat.dilek@...il.com>,
        Changbin Du <changbin.du@...el.com>
Subject: Re: [PATCH printk v1 07/10] console: add write_atomic interface

On Fri, Aug 06, 2021 at 01:02:40PM +0206, John Ogness wrote:
> On 2021-08-03, Andy Shevchenko <andriy.shevchenko@...ux.intel.com> wrote:

...

> >> +			if (!(con->flags & CON_ENABLED))	\
> >> +				continue;			\
> >
> > What about
> >
> > #define console_is_enabled(con)		(!!(con->flags & CON_ENABLED))
> >
> > or inliner equivalent
> >
> > static inline bool console_is_enabled(struct console *con)
> > {
> > 	return !!(con->flags & CON_ENABLED);
> > }
> 
> Generally kernel code uses the console flags directly. A quick check for
> CON_ENABLED shows direct flag queries all over:
> 
> $ git grep -l -e 'flags.*& .*CON_ENABLED' | wc -c
> 16
> 
> Are you suggesting I replace this usage in all of these files? Or just
> the one macro in console.h for now? And since there are 6 more console
> flags, they should probably also have equivalent wrappers?

Introduce it now and reuse in new code, but somebody may clean up the rest in
the future.

-- 
With Best Regards,
Andy Shevchenko