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Date:   Wed, 23 Mar 2022 14:44:22 -0500
From:   Daniel Latypov <>
To:     Guenter Roeck <>
Cc:     Kees Cook <>, David Gow <>,
        Rasmus Villemoes <>,
        Nick Desaulniers <>,
        Vitor Massaru Iha <>,
        Nathan Chancellor <>,
        Arnd Bergmann <>,
        "Gustavo A. R. Silva" <>,,
        KUnit Development <>,
Subject: Re: [PATCH v2] lib: overflow: Convert to Kunit

On Wed, Mar 23, 2022 at 10:29 AM Guenter Roeck <> wrote:
> Hi,
> On Wed, Feb 23, 2022 at 09:48:25PM -0800, Kees Cook wrote:
> > Convert overflow unit tests to KUnit, for better integration into the
> > kernel self test framework. Includes a rename of test_overflow.c to
> >
> This patch results in lots of test build failures
> due to large frame sizes.
> Building i386:allyesconfig ... failed
> --------------
> Error log:
> lib/overflow_kunit.c: In function 'overflow_size_helpers_test':
> lib/overflow_kunit.c:644:1: error: the frame size of 2480 bytes is larger than 2048 bytes

This is somewhat expected and should hopefully be fixed soon.

More detail:
Unless optimized away by the compiler, each KUNIT_EXPECT_* use will
add a struct to the stack.
I have a number of pending patches that will decrease that stack usage.
On UML (x86_64), they cut it down from 88 bytes => 32 bytes per

Shuah sent a PR to Linus which contains these patches,
Once those are in, hopefully all these warnings go away as we're not
over the 2048 limit by that much.


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