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Message-ID: <CAGS_qxqhhu=Jy+vwWZGZLRG4qW5=ZJ8t7QbjtL54onc4-NFnrw@mail.gmail.com>
Date: Mon, 10 Jan 2022 14:32:49 -0800
From: Daniel Latypov <dlatypov@...gle.com>
To: Brendan Higgins <brendanhiggins@...gle.com>
Cc: davidgow@...gle.com, linux-kernel@...r.kernel.org,
kunit-dev@...glegroups.com, linux-kselftest@...r.kernel.org,
skhan@...uxfoundation.org, torvalds@...ux-foundation.org
Subject: Re: [PATCH 2/6] kunit: move check if assertion passed into the macros
On Mon, Jan 10, 2022 at 2:21 PM Brendan Higgins
<brendanhiggins@...gle.com> wrote:
>
> On Fri, Jan 7, 2022 at 8:23 PM Daniel Latypov <dlatypov@...gle.com> wrote:
> >
> > Currently the code always calls kunit_do_assertion() even though it does
> > nothing when `pass` is true.
> >
> > This change moves the `if(!(pass))` check into the macro instead
> > and renames the function to kunit_failed_assertion().
> > I feel this a bit easier to read and understand.
> >
> > This has the potential upside of avoiding a function call that does
> > nothing most of the time (assuming your tests are passing) but comes
> > with the downside of generating a bit more code and branches.
> >
> > This also means we don't have to initialize structs that we don't need,
> > which will become a tiny bit more expensive if we switch over to using
> > static variables to try and reduce stack usage. (There's runtime code
> > to check if the variable has been initialized yet or not).
> >
> > Signed-off-by: Daniel Latypov <dlatypov@...gle.com>
>
> Tiny nit, see below. Otherwise:
>
> Reviewed-by: Brendan Higgins <brendanhiggins@...gle.com>
>
> > ---
> > include/kunit/test.h | 20 ++++++++++----------
> > lib/kunit/test.c | 13 ++++---------
> > 2 files changed, 14 insertions(+), 19 deletions(-)
> >
> > diff --git a/include/kunit/test.h b/include/kunit/test.h
> > index b26400731c02..690a28dfc795 100644
> > --- a/include/kunit/test.h
> > +++ b/include/kunit/test.h
> > @@ -770,18 +770,18 @@ void __printf(2, 3) kunit_log_append(char *log, const char *fmt, ...);
> > */
> > #define KUNIT_SUCCEED(test) do {} while (0)
> >
> > -void kunit_do_assertion(struct kunit *test,
> > - struct kunit_assert *assert,
> > - bool pass,
> > - const char *fmt, ...);
> > +void kunit_failed_assertion(struct kunit *test,
> > + struct kunit_assert *assert,
> > + const char *fmt, ...);
>
> Tiny nit: I think this should be kunit_fail_assertion. I think
> functions should be in the active tense, imperative mood since when
> you call a function you are telling it to do something.
>
> Also, do we need to worry about this getting confused with KUNIT_FAIL,
> or KUNIT_FAIL_ASSERTION:
So do we want to try and pick a different name from
kunit_fail_assertion() to avoid confusion with the macro?
That's partly why I went with past tense.
Perhaps: "kunit_do_assertion() => kunit_do_failed_assertion()" instead?
Tangent: we have some similar confusing names, e.g. KUNIT_ASSERTION is
both the name of a macro and an enum (kunit_assert_type), and those
have the exact same case.
>
> https://elixir.bootlin.com/linux/v5.16/source/include/kunit/test.h#L788
>
> ?
>
> > #define KUNIT_ASSERTION(test, pass, assert_class, INITIALIZER, fmt, ...) do { \
> > - struct assert_class __assertion = INITIALIZER; \
> > - kunit_do_assertion(test, \
> > - &__assertion.assert, \
> > - pass, \
> > - fmt, \
> > - ##__VA_ARGS__); \
> > + if (!(pass)) { \
> > + struct assert_class __assertion = INITIALIZER; \
> > + kunit_failed_assertion(test, \
> > + &__assertion.assert, \
> > + fmt, \
> > + ##__VA_ARGS__); \
> > + } \
> > } while (0)
> >
> >
> > diff --git a/lib/kunit/test.c b/lib/kunit/test.c
> > index c7ed4aabec04..5ad671745483 100644
> > --- a/lib/kunit/test.c
> > +++ b/lib/kunit/test.c
> > @@ -275,16 +275,11 @@ static void __noreturn kunit_abort(struct kunit *test)
> > WARN_ONCE(true, "Throw could not abort from test!\n");
> > }
> >
> > -void kunit_do_assertion(struct kunit *test,
> > - struct kunit_assert *assert,
> > - bool pass,
> > - const char *fmt, ...)
> > +void kunit_failed_assertion(struct kunit *test,
> > + struct kunit_assert *assert,
> > + const char *fmt, ...)
> > {
> > va_list args;
> > -
> > - if (pass)
> > - return;
> > -
> > va_start(args, fmt);
> >
> > assert->message.fmt = fmt;
> > @@ -297,7 +292,7 @@ void kunit_do_assertion(struct kunit *test,
> > if (assert->type == KUNIT_ASSERTION)
> > kunit_abort(test);
> > }
> > -EXPORT_SYMBOL_GPL(kunit_do_assertion);
> > +EXPORT_SYMBOL_GPL(kunit_failed_assertion);
> >
> > void kunit_init_test(struct kunit *test, const char *name, char *log)
> > {
> > --
> > 2.34.1.575.g55b058a8bb-goog
> >
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