linux-kernel - Re: [PATCH 3/3] printk: implement support for extended console drivers

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Message-ID: <CAMuHMdWwH-3kx1ma5KE=fP94by8boxM_QYqPKpU=YJw8t3hYeg@mail.gmail.com>
Date:	Mon, 29 Jun 2015 11:20:41 +0200
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	pmladek@...e.cz, Andrew Morton <akpm@...ux-foundation.org>,
	"David S. Miller" <davem@...emloft.net>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Kay Sievers <kay@...y.org>,
	Josh Triplett <josh@...htriplett.org>,
	Linux Embedded <linux-embedded@...r.kernel.org>
Subject: Re: [PATCH 3/3] printk: implement support for extended console drivers

Hi Tejun,

On Wed, Apr 29, 2015 at 4:45 PM, Tejun Heo <tj@...nel.org> wrote:
> --- a/kernel/printk/printk.c
> +++ b/kernel/printk/printk.c

> @@ -2196,6 +2227,7 @@ out:
>   */
>  void console_unlock(void)
>  {
> +       static char ext_text[CONSOLE_EXT_LOG_MAX];

Can you please
  a) make this feature optional,
  b) (de)allocate this buffer dynamically when the first/last console with
      CON_EXTENDED set is (un)registered?

Your patch is at the top of the bloat-o-meter output (against v4.1):

add/remove: 388/154 grow/shrink: 1309/269 up/down: 92366/-44878 (47488)
function                                     old     new   delta
ext_text                                       -    8192   +8192
do_con_trol                                    -    4824   +4824
path_openat                                 1416    4224   +2808
tvec_bases                                     4    2080   +2076
ip_do_fragment                                 -    1824   +1824
unix_stream_read_generic                       -    1452   +1452
ext4_ext_shift_extents                         -    1350   +1350
ext4_insert_range                              -    1174   +1174
bpf_prepare_filter                           264    1430   +1166
proc_pid_cmdline_read                          -    1020   +1020

and unlike the others, this one is not that difficult to fix.

Thanks!

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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