linux-kernel - Re: [PATCH] riscv: defconfig: k210: Disable CONFIG

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Message-ID: <CAMuHMdW9dySq3y_Uixv8_7e+Pe2VKw4iGV36mx-DbX6-yzk-Gw@mail.gmail.com>
Date:   Wed, 25 Nov 2020 09:51:19 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Damien Le Moal <Damien.LeMoal@....com>
Cc:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        "linux-riscv@...ts.infradead.org" <linux-riscv@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] riscv: defconfig: k210: Disable CONFIG_VT

Hi Damien,

On Wed, Nov 25, 2020 at 7:14 AM Damien Le Moal <Damien.LeMoal@....com> wrote:
> On 2020/11/25 3:57, Geert Uytterhoeven wrote:
> > There is no need to enable Virtual Terminal support in the Canaan
> > Kendryte K210 defconfigs, as no terminal devices are supported and
> > enabled.  Hence disable CONFIG_VT, and remove the no longer needed
> > override for CONFIG_VGA_CONSOLE.
> >
> > This reduces kernel size by ca. 65 KiB.
>
> Indeed, nice saving. Just tested, and all is good.

I used my old script[1] to check the impact of disabling config options.

I don't see any other low-hanging fruits:

Disabling CONFIG_BLOCK saves 492890 bytes
Disabling CONFIG_EXT4_FS saves 322528 bytes
Disabling CONFIG_PRINTK saves 214612 bytes
Disabling CONFIG_SMP saves 214486 bytes
Disabling CONFIG_FRAME_POINTER saves 166368 bytes
Disabling CONFIG_TTY saves 156618 bytes
Disabling CONFIG_PROC_FS saves 110274 bytes
Disabling CONFIG_MMC saves 87656 bytes
Disabling CONFIG_VT saves 70350 bytes
Disabling CONFIG_SYSFS saves 62298 bytes
Disabling CONFIG_BUG saves 50882 bytes
Disabling CONFIG_SPI saves 34420 bytes
Disabling CONFIG_SOC_CANAAN saves 34286 bytes
Disabling CONFIG_I2C saves 34086 bytes
Disabling CONFIG_PROC_SYSCTL saves 23890 bytes
Disabling CONFIG_POSIX_TIMERS saves 18388 bytes
Disabling CONFIG_I2C_DESIGNWARE_PLATFORM saves 17530 bytes
Disabling CONFIG_MMC_BLOCK saves 17200 bytes
Disabling CONFIG_UNIX98_PTYS saves 16360 bytes
Disabling CONFIG_MULTIUSER saves 16148 bytes
Disabling CONFIG_NEW_LEDS saves 15964 bytes
Disabling CONFIG_SPI_DESIGNWARE saves 15434 bytes
Disabling CONFIG_GPIO_CDEV saves 15352 bytes
Disabling CONFIG_MMC_SPI saves 14754 bytes
Disabling CONFIG_SOC_CANAAN_K210_DTB_BUILTIN saves 13864 bytes

(Yes, I have ext4 enabled ;-)

I haven't done enough riscv kernel development yet to assess if I need
CONFIG_FRAME_POINTER or not.

[1] https://github.com/geertu/linux-scripts/blob/master/linux-analyze-marginal-sizes

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