linux-kernel - Re: [PATCH] lib/math/rational.c: Fix divide by zero

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Date:   Mon, 24 May 2021 15:04:21 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     Daniel Latypov <dlatypov@...gle.com>,
        Andy Shevchenko <andriy.shevchenko@...el.com>
Cc:     Trent Piepho <tpiepho@...il.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        andy@...nel.org, Andrew Morton <akpm@...ux-foundation.org>,
        oskar@...ra.com, Yiyuan Guo <yguoaz@...il.com>
Subject: Re: [PATCH] lib/math/rational.c: Fix divide by zero

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


> is necessary
> +       default KUNIT_ALL_TESTS
> +       help
> +               This builds unit tests for the rational number support.
> +
> +               If unsure, say N.


-- 
~Randy