linux-kernel - Re: [RFC PATCH 2/2] kunit: expose ftrace-based API for stubbing out functions during tests

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Date:   Mon, 4 Apr 2022 16:13:47 -0500
From:   Daniel Latypov <dlatypov@...gle.com>
To:     David Gow <davidgow@...gle.com>
Cc:     Brendan Higgins <brendanhiggins@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Shuah Khan <skhan@...uxfoundation.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        kunit-dev@...glegroups.com, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH 2/2] kunit: expose ftrace-based API for stubbing out
 functions during tests

On Thu, Mar 17, 2022 at 9:13 PM David Gow <davidgow@...gle.com> wrote:
> +
> +/** KUNIT_STUBBABLE - marks a function as stubbable when stubbing support is
> + * enabled.
> + *
> + * Stubbing uses ftrace internally, so we can only stub out functions when they
> + * are not inlined. This macro eavlautes to noinline when stubbing support is

Just noting a couple typos lest they be forgotten:
*evaluates

> + * enabled to thus make it safe.
> + *

<snip>

> + *
> + *     void replacement_func(int n)
> + *     {
> + *             pr_info("replacement_func() called with %d", n);
> + *             return 42;
> + *     }
> + *
> + *     void example_test(struct kunit *test)
> + *     {
> + *             kunit_active_ftrace_stub(test, real_func, replacement_func);

*activate