linux-kernel - Re: linux-next: build failure after merge of the block tree

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Date:   Wed, 15 Jul 2020 17:22:11 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Stephen Rothwell <sfr@...b.auug.org.au>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: linux-next: build failure after merge of the block tree

Hi Jens,

> On Wed, Jul 15, 2020 at 5:08 PM Jens Axboe <axboe@...nel.dk> wrote:
> > On 7/15/20 3:24 AM, Geert Uytterhoeven wrote:
> > > On Wed, Jul 15, 2020 at 4:26 AM Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> > >> After merging the block tree, today's linux-next build (arm
> > >> multi_v7_defconfig) failed like this:
> > >>
> > >> block/blk-timeout.c: In function 'blk_round_jiffies':
> > >> block/blk-timeout.c:96:14: error: 'CONFIG_HZ_ROUGH_MASK' undeclared (first use in this function)
> > >>    96 |  return (j + CONFIG_HZ_ROUGH_MASK) + 1;
> > >>       |              ^~~~~~~~~~~~~~~~~~~~
> > >>
> > >> Caused by commit
> > >>
> > >>   91ba0f529364 ("block: relax jiffies rounding for timeouts")
> > >>
> > >> CONFIG_HZ_ROUGH_MASK is not defined for this build even though
> > >> CONFIG_HZ_100 is set. The arm arch does not include kernel/Kconfig.hz.
> > >>
> > >> I have reverted that commit for today.
> > >
> > > (as I don't have the original patch in my email, I'm commenting here)
> > >
> > >     +config HZ_ROUGH_MASK
> > >     +       int
> > >     +       default 127 if HZ_100
> > >     +       default 255 if HZ_250 || HZ_300
> > >     +       default 1023 if HZ_1000
> > >
> > > What about other HZ_* values?
> >
> > Which other ones do we have?
>
> $ git grep "\<HZ_[0-9]" -- "*Kconf*"
> arch/alpha/Kconfig:     default HZ_128 if ALPHA_QEMU
> arch/alpha/Kconfig:     default HZ_1200 if ALPHA_RAWHIDE
> arch/alpha/Kconfig:     default HZ_1024

And ARC allows you to enter any integer value:

    config HZ
            int "Timer Frequency"
            default 100

So probably you want to derive something from the integer value itself.

Note that not all architectures include kernel/Kconfig.hz.

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