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Re: armel/marvell kernel size

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Dear Ben, and other arm/kernel folks,

On Wed, Jan 24, 2018 at 3:30 AM, Ben Hutchings <ben@decadent.org.uk> wrote:
> On Mon, 2018-01-22 at 22:38 +0900, Roger Shimizu wrote:
>
> There's an upstream change in cfg80211 that enables direct-loading of
> wireless rules, which requires public key crypto in the kernel.  There
> doesn't appear to be any option to disable that mode, even though we
> don't need it because crda still works.  Maybe you could disable
> wireless networking completely?

I finally settled a solution, by introducing a new armel flavour:
mini, which doesn't support wireless.
There're still some users that need wireless, so I didn't remove
wireless from armel/marvell directly.

So here I propose to have:
- marvell to support all generic feature and being able to tuned for
performance.
- mini without wireless and being minimum.

Patches are all enclosed, and pushed to salsa rosh/armel_mini branch.
- 0001: Bring back qnap support by a new armel flavour: mini (Disable
WIRELESS, WLAN, etc)
- 0002: [armel/mini] Add flavour mini to installer
- 0003: [armel/mini] Further change a few features as module (I2C,
I2C_CHARDEV, I2C_MV64XXX,
  MTD, MTD_CMDLINE_PARTS, RTC_DRV_MV, and SPI_ORION)

I tested on stretch by cross compiling, here's generated kernel size.
- original 4.16~rc6-1~exp2: 2142704
- After patch 0001: 2017088
- After patch 0002: 2017088
- After patch 0003: 1985896

Here's my testing result regarding those features that changed to module:
(tested under stretch)

> Some options that could possibly be changed from y to m:
>
> - I2C, I2C_CHARDEV, I2C_MV64XXX.  initramfs-tools should include I2C
> drivers to the initramfs if needed, but I'm not certain.

No, i2c nor i2c_mv64xxx will be loaded. But my armel box seems fine
without them.
Of course, manually "modprobe i2c_mv64xxx" will load the module well.

> - MTD, MTD_CMDLINE_PARTS, etc.  But I'm pretty sure this will break
> some systems unless initramfs-tools is updated to include and load the
> cmdlinepart module.
>
> - RTC_DRV_MV (and disable RTC_HCTOSYS).  There's a udev rule that
> should load the system clock from the first RTC if its driver is a
> module.
>
> - SPI_ORION.  initramfs-tools should include this in the initramfs if
> needed, but I'm not certain.

Yes, above 3 modules are loaded without glitch.

> Some options that could possibly be disabled:
>
> - AUDIT.  This is quite a niche feature.

I tried, but couldn't. Maybe next time.

So armel/mini image now reduced 150KB compared to marvell, which now
has enough room for Buster.

Any concern for merging these patches?

Cheers,
-- 
Roger Shimizu, GMT +9 Tokyo
PGP/GPG: 4096R/6C6ACD6417B3ACB1

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Thread

Re: armel/marvell kernel size Ben Hutchings <ben@decadent.org.uk> - 2018-01-18 05:30 +0100
  Re: armel/marvell kernel size Roger Shimizu <rogershimizu@gmail.com> - 2018-01-22 15:00 +0100
    Re: armel/marvell kernel size Ben Hutchings <ben@decadent.org.uk> - 2018-01-23 19:40 +0100
      Re: armel/marvell kernel size Ben Hutchings <ben@decadent.org.uk> - 2018-01-26 19:00 +0100
      Re: armel/marvell kernel size Salvatore Bonaccorso <carnil@debian.org> - 2018-02-17 13:50 +0100
        Re: armel/marvell kernel size Bastian Blank <waldi@debian.org> - 2018-02-17 14:20 +0100
          Re: armel/marvell kernel size Roger Shimizu <rogershimizu@gmail.com> - 2018-03-22 13:00 +0100
        Re: armel/marvell kernel size Roger Shimizu <rogershimizu@gmail.com> - 2018-03-22 13:00 +0100
          Re: armel/marvell kernel size Rogério Brito <rbrito@gmail.com> - 2018-03-22 19:20 +0100
        Re: armel/marvell kernel size Ben Hutchings <ben@decadent.org.uk> - 2018-03-23 00:10 +0100
        Re: armel/marvell kernel size Ben Hutchings <ben@decadent.org.uk> - 2018-03-24 03:00 +0100
          Re: armel/marvell kernel size Rogério Brito <rbrito@gmail.com> - 2018-03-27 07:50 +0200
            Re: armel/marvell kernel size Stefan Monnier <monnier@iro.umontreal.ca> - 2018-03-27 14:40 +0200
              Re: armel/marvell kernel size Rogério Brito <rbrito@ime.usp.br> - 2018-03-27 22:30 +0200
                Re: armel/marvell kernel size Rick Thomas <rbthomas@pobox.com> - 2018-03-27 22:50 +0200
                Re: armel/marvell kernel size Rogério Brito <rbrito@ime.usp.br> - 2018-03-27 23:30 +0200
                Re: armel/marvell kernel size Rick Thomas <rbthomas@pobox.com> - 2018-03-28 11:30 +0200
                Re: armel/marvell kernel size Federico Pietro Briata <federico@briata.org> - 2018-03-28 14:30 +0200
                Re: armel/marvell kernel size Roger Shimizu <rogershimizu@gmail.com> - 2018-04-01 15:30 +0200
                Re: armel/marvell kernel size Rogério Brito <rbrito@ime.usp.br> - 2018-04-03 08:00 +0200
                Re: armel/marvell kernel size Roger Shimizu <rogershimizu@gmail.com> - 2018-04-07 16:20 +0200
                Re: armel/marvell kernel size Roger Shimizu <rogershimizu@gmail.com> - 2018-04-07 17:00 +0200
                Re: armel/marvell kernel size Roger Shimizu <rogershimizu@gmail.com> - 2018-04-13 02:10 +0200
                Re: armel/marvell kernel size Roger Shimizu <rogershimizu@gmail.com> - 2018-04-15 18:30 +0200
                Re: armel/marvell kernel size Rick Thomas <rbthomas@pobox.com> - 2018-04-02 01:50 +0200
                Re: armel/marvell kernel size Stefan Monnier <monnier@iro.umontreal.ca> - 2018-03-27 23:30 +0200
            Re: armel/marvell kernel size Ben Hutchings <ben@decadent.org.uk> - 2018-03-27 21:10 +0200
              Re: armel not to be released anymore? (was: armel/marvell kernel  size) Ben Hutchings <ben@decadent.org.uk> - 2018-03-27 21:30 +0200
              armel not to be released anymore? (was: armel/marvell kernel size) "W. Martin Borgert" <debacle@debian.org> - 2018-03-27 21:40 +0200
                Re: armel not to be released anymore? (was: armel/marvell kernel size) Paul Wise <pabs@debian.org> - 2018-03-28 06:40 +0200
              Re: armel/marvell kernel size Rogério Brito <rbrito@ime.usp.br> - 2018-03-27 22:50 +0200

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