linux-kernel - Re: [PATCH] crypto: api - Do not create test larvals if manager is disabled

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Date:   Thu, 4 Nov 2021 08:58:16 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Damien Le Moal <Damien.LeMoal@....com>
Cc:     Herbert Xu <herbert@...dor.apana.org.au>,
        Nathan Chancellor <nathan@...nel.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Vladis Dronov <vdronov@...hat.com>,
        Simo Sorce <ssorce@...hat.com>,
        Eric Biggers <ebiggers@...nel.org>,
        "llvm@...ts.linux.dev" <llvm@...ts.linux.dev>,
        kernel test robot <lkp@...el.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] crypto: api - Do not create test larvals if manager is disabled

Hi Damien,

On Thu, Nov 4, 2021 at 8:29 AM Damien Le Moal <Damien.LeMoal@....com> wrote:
> On 2021/11/03 0:41, Geert Uytterhoeven wrote:
> > On Tue, 19 Oct 2021, Herbert Xu wrote:
> >> On Tue, Oct 05, 2021 at 07:33:28PM -0700, Nathan Chancellor wrote:
> >>> I assume this is the diff you mean? This does not resolve the issue. My
> >>> apologies if I am slow to respond, I am on vacation until the middle of
> >>> next week.
> >>
> >> Sorry for the delay.  The kernel robot figured out the problem
> >> for me.  It's the crypto_alg_tested call that causes api.c to
> >> depend on algapi.c.  This call is only invoked in the case where
> >> the crypto manager is turned off.  We could instead simply make
> >> test larvals disappear in that case.
> >>
> >> ---8<---
> >> The delayed boot-time testing patch created a dependency loop
> >> between api.c and algapi.c because it added a crypto_alg_tested
> >> call to the former when the crypto manager is disabled.
> >>
> >> We could instead avoid creating the test larvals if the crypto
> >> manager is disabled.  This avoids the dependency loop as well
> >> as saving some unnecessary work, albeit in a very unlikely case.
> >>
> >> Reported-by: Nathan Chancellor <nathan@...nel.org>
> >> Reported-by: Naresh Kamboju <naresh.kamboju@...aro.org>
> >> Reported-by: kernel test robot <lkp@...el.com>
> >> Fixes: adad556efcdd ("crypto: api - Fix built-in testing dependency failures")
> >> Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
> >
> > Thanks for your patch, which is now commit cad439fc040efe5f
> > ("crypto: api - Do not create test larvals if manager is disabled").
> >
> > I have bisected a failure to mount the root file system on k210 to this
> > commit.
> >
> > Dmesg before/after:
> >
> >       mmcblk0: mmc0:0000 SA04G 3.68 GiB
> >       random: fast init done
> >        mmcblk0: p1
> >      -EXT4-fs (mmcblk0p1): mounted filesystem with ordered data mode. Opts: (null). Quota mode: disabled.
> >      -VFS: Mounted root (ext4 filesystem) readonly on device 179:1.
> >      +EXT4-fs (mmcblk0p1): Cannot load crc32c driver.
> >      +VFS: Cannot open root device "mmcblk0p1" or unknown-block(179,1): error -80
>
> p1 exist as the message 2 lines above shows. And since the mount error is -80
> (ELIBBAD), it is really all about crypto. Since the default k210 config compile
> everything in-kernel (no modules), it should work. Was crc32c compiled as a
> module ? If yes, then the k210 will need to be booted with U-Boot and use a real
> initrd, which likely will all end-up in a no memory situation. ext4 in itself
> will consume way too much memory...

Everything is built-in, including crc32c. It worked fine, until the commit
referenced.

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