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Date: Tue, 4 Feb 2020 16:27:12 -0600
From: Frank Rowand <frowand.list@...il.com>
To: Brendan Higgins <brendanhiggins@...gle.com>, jdike@...toit.com,
richard@....at, anton.ivanov@...bridgegreys.com, arnd@...db.de,
keescook@...omium.org, skhan@...uxfoundation.org,
alan.maguire@...cle.com, yzaikin@...gle.com, davidgow@...gle.com,
akpm@...ux-foundation.org, rppt@...ux.ibm.com
Cc: gregkh@...uxfoundation.org, sboyd@...nel.org, logang@...tatee.com,
mcgrof@...nel.org, knut.omang@...cle.com,
linux-um@...ts.infradead.org, linux-arch@...r.kernel.org,
linux-kselftest@...r.kernel.org, kunit-dev@...glegroups.com,
linux-kernel@...r.kernel.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH v2 3/7] kunit: test: create a single centralized executor
for all tests
On 1/30/20 5:08 PM, Brendan Higgins wrote:
> From: Alan Maguire <alan.maguire@...cle.com>
>
> Add a centralized executor to dispatch tests rather than relying on
> late_initcall to schedule each test suite separately. Centralized
> execution is for built-in tests only; modules will execute tests
> when loaded.
>
> Signed-off-by: Alan Maguire <alan.maguire@...cle.com>
> Co-developed-by: Iurii Zaikin <yzaikin@...gle.com>
> Signed-off-by: Iurii Zaikin <yzaikin@...gle.com>
> Co-developed-by: Brendan Higgins <brendanhiggins@...gle.com>
> Signed-off-by: Brendan Higgins <brendanhiggins@...gle.com>
> Reviewed-by: Stephen Boyd <sboyd@...nel.org>
> ---
> include/kunit/test.h | 73 +++++++++++++++++++++++++++-----------------
> lib/kunit/Makefile | 3 +-
> lib/kunit/executor.c | 36 ++++++++++++++++++++++
> 3 files changed, 83 insertions(+), 29 deletions(-)
> create mode 100644 lib/kunit/executor.c
>
> diff --git a/include/kunit/test.h b/include/kunit/test.h
> index 2dfb550c6723a..8a02f93a6b505 100644
> --- a/include/kunit/test.h
> +++ b/include/kunit/test.h
The following fragment does not match the test.h in Linux 5.5 or 5.4-rc1 (as one
possible earlier version). And we are not to Linux 5.5-rc1 yet. (Simple way
to check for the mis-match - 5.5 has kunit_test_suite() instead of
kunit_test_suites().)
I know that there is an alternate tree where some of the development occurs.
Can you please add a link in MAINTAINERS? And please note (at least in
patch 0) what tree the series is developed against?
-Frank
> @@ -197,46 +197,63 @@ void kunit_init_test(struct kunit *test, const char *name);
>
> int kunit_run_tests(struct kunit_suite *suite);
>
> -/**
> - * kunit_test_suites() - used to register one or more &struct kunit_suite
> - * with KUnit.
> - *
> - * @suites: a statically allocated list of &struct kunit_suite.
> - *
> - * Registers @suites with the test framework. See &struct kunit_suite for
> - * more information.
> - *
> - * When builtin, KUnit tests are all run as late_initcalls; this means
> - * that they cannot test anything where tests must run at a different init
> - * phase. One significant restriction resulting from this is that KUnit
> - * cannot reliably test anything that is initialize in the late_init phase;
> - * another is that KUnit is useless to test things that need to be run in
> - * an earlier init phase.
> - *
> - * An alternative is to build the tests as a module. Because modules
> - * do not support multiple late_initcall()s, we need to initialize an
> - * array of suites for a module.
> - *
> - * TODO(brendanhiggins@...gle.com): Don't run all KUnit tests as
> - * late_initcalls. I have some future work planned to dispatch all KUnit
> - * tests from the same place, and at the very least to do so after
> - * everything else is definitely initialized.
> +/*
> + * If a test suite is built-in, module_init() gets translated into
> + * an initcall which we don't want as the idea is that for builtins
> + * the executor will manage execution. So ensure we do not define
> + * module_{init|exit} functions for the builtin case when registering
> + * suites via kunit_test_suites() below.
> */
> -#define kunit_test_suites(...) \
> - static struct kunit_suite *suites[] = { __VA_ARGS__, NULL}; \
> - static int kunit_test_suites_init(void) \
> +#ifdef MODULE
> +#define kunit_test_suites_for_module(__suites) \
> + static int __init kunit_test_suites_init(void) \
> { \
> + struct kunit_suite *suites[] = (__suites); \
> unsigned int i; \
> + \
> for (i = 0; suites[i] != NULL; i++) \
> kunit_run_tests(suites[i]); \
> return 0; \
> } \
> - late_initcall(kunit_test_suites_init); \
> + module_init(kunit_test_suites_init); \
> + \
> static void __exit kunit_test_suites_exit(void) \
> { \
> return; \
> } \
> module_exit(kunit_test_suites_exit)
> +#else
> +#define kunit_test_suites_for_module(__suites)
> +#endif /* MODULE */
> +
> +#define __kunit_test_suites(unique_array, unique_suites, ...) \
> + static struct kunit_suite *unique_array[] = { __VA_ARGS__, NULL }; \
> + kunit_test_suites_for_module(unique_array); \
> + static struct kunit_suite **unique_suites \
> + __used __aligned(8) __section(.kunit_test_suites) = unique_array
> +
> +/**
> + * kunit_test_suites() - used to register one or more &struct kunit_suite
> + * with KUnit.
> + *
> + * @suites: a statically allocated list of &struct kunit_suite.
> + *
> + * Registers @suites with the test framework. See &struct kunit_suite for
> + * more information.
> + *
> + * When builtin, KUnit tests are all run via executor; this is done
> + * by placing the array of struct kunit_suite * in the .kunit_test_suites
> + * ELF section.
> + *
> + * An alternative is to build the tests as a module. Because modules do not
> + * support multiple initcall()s, we need to initialize an array of suites for a
> + * module.
> + *
> + */
> +#define kunit_test_suites(...) \
> + __kunit_test_suites(__UNIQUE_ID(array), \
> + __UNIQUE_ID(suites), \
> + __VA_ARGS__)
>
> #define kunit_test_suite(suite) kunit_test_suites(&suite)
>
> diff --git a/lib/kunit/Makefile b/lib/kunit/Makefile
> index fab55649b69a5..c282f02ca066b 100644
> --- a/lib/kunit/Makefile
> +++ b/lib/kunit/Makefile
> @@ -3,7 +3,8 @@ obj-$(CONFIG_KUNIT) += kunit.o
> kunit-objs += test.o \
> string-stream.o \
> assert.o \
> - try-catch.o
> + try-catch.o \
> + executor.o
>
> obj-$(CONFIG_KUNIT_TEST) += kunit-test.o
>
> diff --git a/lib/kunit/executor.c b/lib/kunit/executor.c
> new file mode 100644
> index 0000000000000..6429927d598a5
> --- /dev/null
> +++ b/lib/kunit/executor.c
> @@ -0,0 +1,36 @@
> +// SPDX-License-Identifier: GPL-2.0
> +
> +#include <kunit/test.h>
> +
> +/*
> + * These symbols point to the .kunit_test_suites section and are defined in
> + * include/asm-generic/vmlinux.lds.h, and consequently must be extern.
> + */
> +extern struct kunit_suite * const * const __kunit_suites_start[];
> +extern struct kunit_suite * const * const __kunit_suites_end[];
> +
> +#if IS_BUILTIN(CONFIG_KUNIT)
> +
> +static int kunit_run_all_tests(void)
> +{
> + struct kunit_suite * const * const *suites, * const *subsuite;
> + bool has_test_failed = false;
> +
> + for (suites = __kunit_suites_start;
> + suites < __kunit_suites_end;
> + suites++) {
> + for (subsuite = *suites; *subsuite != NULL; subsuite++) {
> + if (kunit_run_tests(*subsuite))
> + has_test_failed = true;
> + }
> + }
> +
> + if (has_test_failed)
> + return -EFAULT;
> +
> + return 0;
> +}
> +
> +late_initcall(kunit_run_all_tests);
> +
> +#endif /* IS_BUILTIN(CONFIG_KUNIT) */
>
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