From: Randy Dunlap <rdunlap@infradead.org>
To: Daniel Latypov <dlatypov@google.com>
Cc: Andy Shevchenko <andriy.shevchenko@intel.com>,
Trent Piepho <tpiepho@gmail.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
andy@kernel.org, Andrew Morton <akpm@linux-foundation.org>,
Oskar Schirmer <oskar@scara.com>, Yiyuan Guo <yguoaz@gmail.com>
Subject: Re: [PATCH] lib/math/rational.c: Fix divide by zero
Date: Mon, 24 May 2021 16:30:00 -0700 [thread overview]
Message-ID: <bd3fceb3-4d49-befb-ee3b-bc01ef5d6827@infradead.org> (raw)
In-Reply-To: <CAGS_qxrZAxvRD5Scvd-dMahnf-27npMjbzKKjG-+Bk7hZgZj5g@mail.gmail.com>
On 5/24/21 3:56 PM, Daniel Latypov wrote:
> On Mon, May 24, 2021 at 3:04 PM Randy Dunlap <rdunlap@infradead.org> wrote:
>>
>> On 5/24/21 9:55 AM, Daniel Latypov wrote:
>>> diff --git a/lib/math/Kconfig b/lib/math/Kconfig
>>> index f19bc9734fa7..20460b567493 100644
>>> --- a/lib/math/Kconfig
>>> +++ b/lib/math/Kconfig
>>> @@ -15,3 +15,14 @@ config PRIME_NUMBERS
>>>
>>> config RATIONAL
>>> bool
>>> +
>>> +config RATIONAL_KUNIT_TEST
>>> + tristate "KUnit test for rational number support" if !KUNIT_ALL_TESTS
>>> + # depends on KUNIT && RATIONAL # this is how it should work, but
>>> + depends on KUNIT
>>> + select RATIONAL # I don't grok kconfig enough to know why this
>>
>> Only to set the symbol CONFIG_RATIONAL.
>> Then when 'make' descends into the lib/math/ subdir and looks at its Makefile,
>> it will decide to build the binary rational.o.
>>
>> obj-$(CONFIG_RATIONAL) += rational.o
>>
>
> Ack, I understand that much.
Oh! Clearly I misunderstood the problem.
I had to look thru 60 config files before I found one where CONFIG_RATIONAL
was not set.
And I'm still not sure, but I believe that it's because it has to be set
by some other Kconfig entry doing a 'select' on it.
Here are the kconfigs that select it (on i386, where I found it not set):
- COMMON_CLK [=n] && !HAVE_LEGACY_CLK [=n]
- SERIAL_8250_LPSS [=n] && TTY [=n] && HAS_IOMEM [=y] && SERIAL_8250 [=n] && PCI [=n] && (X86 [=y] || COMPILE_TEST [=y])
- SERIAL_8250_MID [=n] && TTY [=n] && HAS_IOMEM [=y] && SERIAL_8250 [=n] && PCI [=n] && (X86 [=y] || COMPILE_TEST [=y])
- SERIAL_IMX [=n] && TTY [=n] && HAS_IOMEM [=y] && (ARCH_MXC || COMPILE_TEST [=y])
- VIDEO_V4L2 [=n] && MEDIA_SUPPORT [=n] && (I2C [=y] || I2C [=y]=n) && VIDEO_DEV [=n]
- SND_SOC_ROCKCHIP_PDM [=n] && SOUND [=n] && !UML && SND [=n] && SND_SOC [=n] && CLKDEV_LOOKUP [=n] && SND_SOC_ROCKCHIP [=n]
- COMMON_CLK_QCOM [=n] && COMMON_CLK [=n] && OF [=y] && (ARCH_QCOM || COMPILE_TEST [=y])
but my test config has none of those enabled, so I cannot set RATIONAL.
I guess the easiest solution is to have KUNIT or some sub-KUNIT test
just select RATIONAL.
> My confusion is why this doesn't work:
>
> $ ./tools/testing/kunit/kunit.py run --kunitconfig /dev/stdin <<EOF
> CONFIG_KUNIT=y
> CONFIG_RATIONAL=y
> EOF
> ...
> ERROR:root:Provided Kconfig is not contained in validated .config.
> Following fields found in kunitconfig, but not in .config:
> CONFIG_RATIONAL=y
>
> What it's complaining about is that `make ARCH=um olddefconfig` is
> leaving CONFIG_RATIONAL=y unset.
>
> Stripping out kunit.py, it's this:
>
> $ echo -e 'CONFIG_KUNIT=y\nCONFIG_RATIONAL=y' > .kunit/.config
> $ make ARCH=um olddefconfig O=.kunit
> $ grep RATIONAL .kunit/.config
>
> I'm not versed in Kconfig enough to know why CONFIG_RATIONAL=y is
> getting removed.
>
>>
>>> is necessary
>>> + default KUNIT_ALL_TESTS
>>> + help
>>> + This builds unit tests for the rational number support.
>>> +
>>> + If unsure, say N.
--
~Randy
next prev parent reply other threads:[~2021-05-24 23:30 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-23 0:18 [PATCH] lib/math/rational.c: Fix divide by zero Trent Piepho
2021-05-24 10:51 ` Andy Shevchenko
2021-05-24 16:55 ` Daniel Latypov
2021-05-24 22:04 ` Randy Dunlap
2021-05-24 22:56 ` Daniel Latypov
2021-05-24 23:30 ` Randy Dunlap [this message]
2021-05-24 23:38 ` Daniel Latypov
2021-05-25 0:42 ` David Gow
2021-05-25 1:49 ` Randy Dunlap
2021-05-25 1:57 ` David Gow
2021-05-25 5:08 ` Trent Piepho
2021-05-24 20:17 ` Trent Piepho
2021-05-24 20:35 ` Daniel Latypov
2021-05-25 9:02 ` Andy Shevchenko
2021-05-25 9:21 ` Trent Piepho
2021-05-25 12:03 ` Andy Shevchenko
2021-05-25 17:10 ` Daniel Latypov
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