[PATCH v2 0/3] tools/nolibc: Support vprintf() so we can use kselftest.h with nolibc

[PATCH v2 0/3] tools/nolibc: Support vprintf() so we can use kselftest.h with nolibc

[Mark Brown]

At present the kselftest header can't be used with nolibc since it makes
use of vprintf() which is not available in nolibc.  Fortunately nolibc
has a vfprintf() so we can just wrap that in order to allow kselftests
to be built with nolibc and still use the standard kselftest headers
with a small change to prevent the inclusion of the standard libc
headers.  This allows us to avoid open coding of KTAP output for
selftests that need to use nolibc in order to test interfaces that are
controlled by libc, we've got several open coded examples of this in the
tree already.

As an example of using this the existing za-fork test is converted to
use kselftest.h.  The changes to kselftest and nolibc don't have any
interaction until they are used by a test so could be merged separately
if desired.

Signed-off-by: Mark Brown <broonie@kernel.org>
---
Changes in v2:
- Turns out nolibc has a vfprintf() already which we can use so do that.
- Link to v1: https://lore.kernel.org/r/20230405-kselftest-nolibc-v1-0-63fbcd70b202@kernel.org

---
Mark Brown (3):
      tools/nolibc/stdio: Implement vprintf()
      kselftest: Support nolibc
      kselftest/arm64: Convert za-fork to use kselftest.h

 tools/include/nolibc/stdio.h               |  6 ++
 tools/testing/selftests/arm64/fp/Makefile  |  2 +-
 tools/testing/selftests/arm64/fp/za-fork.c | 88 ++++++------------------------
 tools/testing/selftests/kselftest.h        |  2 +
 4 files changed, 25 insertions(+), 73 deletions(-)
---
base-commit: e8d018dd0257f744ca50a729e3d042cf2ec9da65
change-id: 20230405-kselftest-nolibc-cb2ce0446d09

Best regards,
-- 
Mark Brown <broonie@kernel.org>


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[PATCH v2 1/3] tools/nolibc/stdio: Implement vprintf()

[Mark Brown]

vprintf() is equivalent to vfprintf() to stdout so implement it as a simple
wrapper for the existing vfprintf(), allowing us to build kselftest.h.

Suggested-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 tools/include/nolibc/stdio.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tools/include/nolibc/stdio.h b/tools/include/nolibc/stdio.h
index 96ac8afc5aee..6cbbb52836a0 100644
--- a/tools/include/nolibc/stdio.h
+++ b/tools/include/nolibc/stdio.h
@@ -273,6 +273,12 @@ int vfprintf(FILE *stream, const char *fmt, va_list args)
 	return written;
 }
 
+static __attribute__((unused))
+int vprintf(const char *fmt, va_list args)
+{
+	return vfprintf(stdout, fmt, args);
+}
+
 static __attribute__((unused, format(printf, 2, 3)))
 int fprintf(FILE *stream, const char *fmt, ...)
 {

-- 
2.30.2


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Re: [PATCH v2 1/3] tools/nolibc/stdio: Implement vprintf()

[Willy Tarreau]

On Thu, Apr 06, 2023 at 05:19:10PM +0100, Mark Brown wrote:
> vprintf() is equivalent to vfprintf() to stdout so implement it as a simple
> wrapper for the existing vfprintf(), allowing us to build kselftest.h.
> 
> Suggested-by: Willy Tarreau <w@1wt.eu>
> Signed-off-by: Mark Brown <broonie@kernel.org>
> ---
>  tools/include/nolibc/stdio.h | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/tools/include/nolibc/stdio.h b/tools/include/nolibc/stdio.h
> index 96ac8afc5aee..6cbbb52836a0 100644
> --- a/tools/include/nolibc/stdio.h
> +++ b/tools/include/nolibc/stdio.h
> @@ -273,6 +273,12 @@ int vfprintf(FILE *stream, const char *fmt, va_list args)
>  	return written;
>  }
>  
> +static __attribute__((unused))
> +int vprintf(const char *fmt, va_list args)
> +{
> +	return vfprintf(stdout, fmt, args);
> +}
> +
>  static __attribute__((unused, format(printf, 2, 3)))
>  int fprintf(FILE *stream, const char *fmt, ...)
>  {

Perfect, thank you Mark, I'm glad that it simplified the rest of
your series.

Acked-by: Willy Tarreau <w@1wt.eu>

Paul, feel free to directly queue this one for 6.5. If you prefer I
can as well queue it on my side and send it later, it's just that I
have exactly zero extra value on top of this one ;-)

Thanks,
Willy

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Re: [PATCH v2 1/3] tools/nolibc/stdio: Implement vprintf()

[Paul E. McKenney]

On Thu, Apr 06, 2023 at 08:26:09PM +0200, Willy Tarreau wrote:
> On Thu, Apr 06, 2023 at 05:19:10PM +0100, Mark Brown wrote:
> > vprintf() is equivalent to vfprintf() to stdout so implement it as a simple
> > wrapper for the existing vfprintf(), allowing us to build kselftest.h.
> > 
> > Suggested-by: Willy Tarreau <w@1wt.eu>
> > Signed-off-by: Mark Brown <broonie@kernel.org>
> > ---
> >  tools/include/nolibc/stdio.h | 6 ++++++
> >  1 file changed, 6 insertions(+)
> > 
> > diff --git a/tools/include/nolibc/stdio.h b/tools/include/nolibc/stdio.h
> > index 96ac8afc5aee..6cbbb52836a0 100644
> > --- a/tools/include/nolibc/stdio.h
> > +++ b/tools/include/nolibc/stdio.h
> > @@ -273,6 +273,12 @@ int vfprintf(FILE *stream, const char *fmt, va_list args)
> >  	return written;
> >  }
> >  
> > +static __attribute__((unused))
> > +int vprintf(const char *fmt, va_list args)
> > +{
> > +	return vfprintf(stdout, fmt, args);
> > +}
> > +
> >  static __attribute__((unused, format(printf, 2, 3)))
> >  int fprintf(FILE *stream, const char *fmt, ...)
> >  {
> 
> Perfect, thank you Mark, I'm glad that it simplified the rest of
> your series.
> 
> Acked-by: Willy Tarreau <w@1wt.eu>
> 
> Paul, feel free to directly queue this one for 6.5. If you prefer I
> can as well queue it on my side and send it later, it's just that I
> have exactly zero extra value on top of this one ;-)

Alternatively, if it would be more convenient for Mark to send this
up via kselftest:

Acked-by: Paul E. McKenney <paulmck@kernel.org>

It currently merges cleanly with the -rcu tree's dev branch, so this
should not be a problem.

Either way, please let me know, Mark!

							Thanx, Paul

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Re: [PATCH v2 1/3] tools/nolibc/stdio: Implement vprintf()

[Shuah Khan]

On 4/6/23 12:43, Paul E. McKenney wrote:
> On Thu, Apr 06, 2023 at 08:26:09PM +0200, Willy Tarreau wrote:
>> On Thu, Apr 06, 2023 at 05:19:10PM +0100, Mark Brown wrote:
>>> vprintf() is equivalent to vfprintf() to stdout so implement it as a simple
>>> wrapper for the existing vfprintf(), allowing us to build kselftest.h.
>>>
>>> Suggested-by: Willy Tarreau <w@1wt.eu>
>>> Signed-off-by: Mark Brown <broonie@kernel.org>
>>> ---
>>>   tools/include/nolibc/stdio.h | 6 ++++++
>>>   1 file changed, 6 insertions(+)
>>>
>>> diff --git a/tools/include/nolibc/stdio.h b/tools/include/nolibc/stdio.h
>>> index 96ac8afc5aee..6cbbb52836a0 100644
>>> --- a/tools/include/nolibc/stdio.h
>>> +++ b/tools/include/nolibc/stdio.h
>>> @@ -273,6 +273,12 @@ int vfprintf(FILE *stream, const char *fmt, va_list args)
>>>   	return written;
>>>   }
>>>   
>>> +static __attribute__((unused))
>>> +int vprintf(const char *fmt, va_list args)
>>> +{
>>> +	return vfprintf(stdout, fmt, args);
>>> +}
>>> +
>>>   static __attribute__((unused, format(printf, 2, 3)))
>>>   int fprintf(FILE *stream, const char *fmt, ...)
>>>   {
>>
>> Perfect, thank you Mark, I'm glad that it simplified the rest of
>> your series.
>>
>> Acked-by: Willy Tarreau <w@1wt.eu>
>>
>> Paul, feel free to directly queue this one for 6.5. If you prefer I
>> can as well queue it on my side and send it later, it's just that I
>> have exactly zero extra value on top of this one ;-)
> 
> Alternatively, if it would be more convenient for Mark to send this
> up via kselftest:
> 
> Acked-by: Paul E. McKenney <paulmck@kernel.org>
> 
> It currently merges cleanly with the -rcu tree's dev branch, so this
> should not be a problem.
> 
> Either way, please let me know, Mark!
> 
> 						

I can take these through kselftest or can go through arm64

Acked-by: Shuah Khan <skhan@linuxfoundation.org>

thanks,
-- Shuah

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Re: [PATCH v2 1/3] tools/nolibc/stdio: Implement vprintf()

[Mark Brown]

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On Mon, Apr 10, 2023 at 12:30:04PM -0600, Shuah Khan wrote:
> On 4/6/23 12:43, Paul E. McKenney wrote:

> > Alternatively, if it would be more convenient for Mark to send this
> > up via kselftest:

> > Acked-by: Paul E. McKenney <paulmck@kernel.org>

> > It currently merges cleanly with the -rcu tree's dev branch, so this
> > should not be a problem.

> > Either way, please let me know, Mark!

> I can take these through kselftest or can go through arm64

> Acked-by: Shuah Khan <skhan@linuxfoundation.org>

It seems like more of a kselftest change than anything else so probably
makes sense for it to go that way?  The example user isn't really even
needed.

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Re: [PATCH v2 1/3] tools/nolibc/stdio: Implement vprintf()

[Will Deacon]

On Tue, Apr 11, 2023 at 03:31:10PM +0100, Mark Brown wrote:
> On Mon, Apr 10, 2023 at 12:30:04PM -0600, Shuah Khan wrote:
> > On 4/6/23 12:43, Paul E. McKenney wrote:
> 
> > > Alternatively, if it would be more convenient for Mark to send this
> > > up via kselftest:
> 
> > > Acked-by: Paul E. McKenney <paulmck@kernel.org>
> 
> > > It currently merges cleanly with the -rcu tree's dev branch, so this
> > > should not be a problem.
> 
> > > Either way, please let me know, Mark!
> 
> > I can take these through kselftest or can go through arm64
> 
> > Acked-by: Shuah Khan <skhan@linuxfoundation.org>
> 
> It seems like more of a kselftest change than anything else so probably
> makes sense for it to go that way?  The example user isn't really even
> needed.

Fine by me, as long as it doesn't conflict with any other arm64 selftest
changes you hope to land for 6.4.

Will

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Re: [PATCH v2 1/3] tools/nolibc/stdio: Implement vprintf()

[Mark Brown]

[-- Attachment #1.1: Type: text/plain, Size: 428 bytes --]

On Tue, Apr 11, 2023 at 04:03:21PM +0100, Will Deacon wrote:
> On Tue, Apr 11, 2023 at 03:31:10PM +0100, Mark Brown wrote:

> > It seems like more of a kselftest change than anything else so probably
> > makes sense for it to go that way?  The example user isn't really even
> > needed.

> Fine by me, as long as it doesn't conflict with any other arm64 selftest
> changes you hope to land for 6.4.

That shouldn't be an issue.

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Re: [PATCH v2 1/3] tools/nolibc/stdio: Implement vprintf()

[Paul E. McKenney]

On Tue, Apr 11, 2023 at 04:13:11PM +0100, Mark Brown wrote:
> On Tue, Apr 11, 2023 at 04:03:21PM +0100, Will Deacon wrote:
> > On Tue, Apr 11, 2023 at 03:31:10PM +0100, Mark Brown wrote:
> 
> > > It seems like more of a kselftest change than anything else so probably
> > > makes sense for it to go that way?  The example user isn't really even
> > > needed.
> 
> > Fine by me, as long as it doesn't conflict with any other arm64 selftest
> > changes you hope to land for 6.4.
> 
> That shouldn't be an issue.

Shuah, looks to me like this one is yours in kselftest, then.  ;-)

							Thanx, Paul

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Re: [PATCH v2 1/3] tools/nolibc/stdio: Implement vprintf()

[Shuah Khan]

On 4/11/23 10:44, Paul E. McKenney wrote:
> On Tue, Apr 11, 2023 at 04:13:11PM +0100, Mark Brown wrote:
>> On Tue, Apr 11, 2023 at 04:03:21PM +0100, Will Deacon wrote:
>>> On Tue, Apr 11, 2023 at 03:31:10PM +0100, Mark Brown wrote:
>>
>>>> It seems like more of a kselftest change than anything else so probably
>>>> makes sense for it to go that way?  The example user isn't really even
>>>> needed.
>>
>>> Fine by me, as long as it doesn't conflict with any other arm64 selftest
>>> changes you hope to land for 6.4.
>>
>> That shouldn't be an issue.
> 
> Shuah, looks to me like this one is yours in kselftest, then.  ;-)
> 
> 							Thanx, Paul

I will pick these up for Linux 6.4
thanks,
-- Shuah

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Re: [PATCH v2 1/3] tools/nolibc/stdio: Implement vprintf()

[Will Deacon]

On Tue, Apr 11, 2023 at 12:54:29PM -0600, Shuah Khan wrote:
> On 4/11/23 10:44, Paul E. McKenney wrote:
> > On Tue, Apr 11, 2023 at 04:13:11PM +0100, Mark Brown wrote:
> > > On Tue, Apr 11, 2023 at 04:03:21PM +0100, Will Deacon wrote:
> > > > On Tue, Apr 11, 2023 at 03:31:10PM +0100, Mark Brown wrote:
> > > 
> > > > > It seems like more of a kselftest change than anything else so probably
> > > > > makes sense for it to go that way?  The example user isn't really even
> > > > > needed.
> > > 
> > > > Fine by me, as long as it doesn't conflict with any other arm64 selftest
> > > > changes you hope to land for 6.4.
> > > 
> > > That shouldn't be an issue.
> > 
> > Shuah, looks to me like this one is yours in kselftest, then.  ;-)
> > 
> > 							Thanx, Paul
> 
> I will pick these up for Linux 6.4

Cheers, Shuah!

Will

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[PATCH v2 2/3] kselftest: Support nolibc

[Mark Brown]

Rather than providing headers for inclusion which replace any offered by
the system nolibc is provided in the form of a header which should be added
to the build via the compiler command line. In order to build with nolibc
we need to not include the standard C headers, especially not stdio.h where
the definitions of stdout, stdin and stderr will actively conflict with
nolibc.

Add an include guard which suppresses the inclusion of the standard headers
when building with nolibc, allowing us to build tests using the nolibc
headers.  This allows us to avoid open coding of KTAP output for
selftests that need to use nolibc in order to test interfaces that are
controlled by libc.

Signed-off-by: Mark Brown <broonie@kernel.org>
---
 tools/testing/selftests/kselftest.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/testing/selftests/kselftest.h b/tools/testing/selftests/kselftest.h
index 33a0dbd26bd3..829be379545a 100644
--- a/tools/testing/selftests/kselftest.h
+++ b/tools/testing/selftests/kselftest.h
@@ -43,11 +43,13 @@
 #ifndef __KSELFTEST_H
 #define __KSELFTEST_H
 
+#ifndef NOLIBC
 #include <errno.h>
 #include <stdlib.h>
 #include <unistd.h>
 #include <stdarg.h>
 #include <stdio.h>
+#endif
 
 #ifndef ARRAY_SIZE
 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))

-- 
2.30.2


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[PATCH v2 3/3] kselftest/arm64: Convert za-fork to use kselftest.h

[Mark Brown]

Now that kselftest.h can be used with nolibc convert the za-fork test to
use it. We do still have to open code ksft_print_msg() but that's not the
end of the world. Some of the advantage comes from using printf() which we
could have been using already.

This does change the output when tests are skipped, bringing it in line
with the standard kselftest output by removing the test name - we move
from

    ok 0 skipped

to

    ok 1 # SKIP fork_test

The old output was not following KTAP format for skips, and the
numbering was not standard or consistent with the reported plan.

Signed-off-by: Mark Brown <broonie@kernel.org>
---
 tools/testing/selftests/arm64/fp/Makefile  |  2 +-
 tools/testing/selftests/arm64/fp/za-fork.c | 88 ++++++------------------------
 2 files changed, 17 insertions(+), 73 deletions(-)

diff --git a/tools/testing/selftests/arm64/fp/Makefile b/tools/testing/selftests/arm64/fp/Makefile
index 48f56c86ad45..b413b0af07f9 100644
--- a/tools/testing/selftests/arm64/fp/Makefile
+++ b/tools/testing/selftests/arm64/fp/Makefile
@@ -38,7 +38,7 @@ $(OUTPUT)/vec-syscfg: vec-syscfg.c $(OUTPUT)/rdvl.o
 $(OUTPUT)/vlset: vlset.c
 $(OUTPUT)/za-fork: za-fork.c $(OUTPUT)/za-fork-asm.o
 	$(CC) -fno-asynchronous-unwind-tables -fno-ident -s -Os -nostdlib \
-		-include ../../../../include/nolibc/nolibc.h \
+		-include ../../../../include/nolibc/nolibc.h -I../..\
 		-static -ffreestanding -Wall $^ -o $@
 $(OUTPUT)/za-ptrace: za-ptrace.c
 $(OUTPUT)/za-test: za-test.S $(OUTPUT)/asm-utils.o
diff --git a/tools/testing/selftests/arm64/fp/za-fork.c b/tools/testing/selftests/arm64/fp/za-fork.c
index ff475c649e96..b86cb1049497 100644
--- a/tools/testing/selftests/arm64/fp/za-fork.c
+++ b/tools/testing/selftests/arm64/fp/za-fork.c
@@ -9,42 +9,9 @@
 #include <linux/sched.h>
 #include <linux/wait.h>
 
-#define EXPECTED_TESTS 1
-
-static void putstr(const char *str)
-{
-	write(1, str, strlen(str));
-}
-
-static void putnum(unsigned int num)
-{
-	char c;
-
-	if (num / 10)
-		putnum(num / 10);
-
-	c = '0' + (num % 10);
-	write(1, &c, 1);
-}
+#include "kselftest.h"
 
-static int tests_run;
-static int tests_passed;
-static int tests_failed;
-static int tests_skipped;
-
-static void print_summary(void)
-{
-	if (tests_passed + tests_failed + tests_skipped != EXPECTED_TESTS)
-		putstr("# UNEXPECTED TEST COUNT: ");
-
-	putstr("# Totals: pass:");
-	putnum(tests_passed);
-	putstr(" fail:");
-	putnum(tests_failed);
-	putstr(" xfail:0 xpass:0 skip:");
-	putnum(tests_skipped);
-	putstr(" error:0\n");
-}
+#define EXPECTED_TESTS 1
 
 int fork_test(void);
 int verify_fork(void);
@@ -63,22 +30,21 @@ int fork_test_c(void)
 	if (newpid == 0) {
 		/* In child */
 		if (!verify_fork()) {
-			putstr("# ZA state invalid in child\n");
+			ksft_print_msg("ZA state invalid in child\n");
 			exit(0);
 		} else {
 			exit(1);
 		}
 	}
 	if (newpid < 0) {
-		putstr("# fork() failed: -");
-		putnum(-newpid);
-		putstr("\n");
+		ksft_print_msg("fork() failed: %d\n", newpid);
+
 		return 0;
 	}
 
 	parent_result = verify_fork();
 	if (!parent_result)
-		putstr("# ZA state invalid in parent\n");
+		ksft_print_msg("ZA state invalid in parent\n");
 
 	for (;;) {
 		waiting = waitpid(newpid, &child_status, 0);
@@ -86,18 +52,16 @@ int fork_test_c(void)
 		if (waiting < 0) {
 			if (errno == EINTR)
 				continue;
-			putstr("# waitpid() failed: ");
-			putnum(errno);
-			putstr("\n");
+			ksft_print_msg("waitpid() failed: %d\n", errno);
 			return 0;
 		}
 		if (waiting != newpid) {
-			putstr("# waitpid() returned wrong PID\n");
+			ksft_print_msg("waitpid() returned wrong PID\n");
 			return 0;
 		}
 
 		if (!WIFEXITED(child_status)) {
-			putstr("# child did not exit\n");
+			ksft_print_msg("child did not exit\n");
 			return 0;
 		}
 
@@ -105,29 +69,14 @@ int fork_test_c(void)
 	}
 }
 
-#define run_test(name)			     \
-	if (name()) {			     \
-		tests_passed++;		     \
-	} else {			     \
-		tests_failed++;		     \
-		putstr("not ");		     \
-	}				     \
-	putstr("ok ");			     \
-	putnum(++tests_run);		     \
-	putstr(" " #name "\n");
-
 int main(int argc, char **argv)
 {
 	int ret, i;
 
-	putstr("TAP version 13\n");
-	putstr("1..");
-	putnum(EXPECTED_TESTS);
-	putstr("\n");
+	ksft_print_header();
+	ksft_set_plan(EXPECTED_TESTS);
 
-	putstr("# PID: ");
-	putnum(getpid());
-	putstr("\n");
+	ksft_print_msg("PID: %d\n", getpid());
 
 	/*
 	 * This test is run with nolibc which doesn't support hwcap and
@@ -136,21 +85,16 @@ int main(int argc, char **argv)
 	 */
 	ret = open("/proc/sys/abi/sme_default_vector_length", O_RDONLY, 0);
 	if (ret >= 0) {
-		run_test(fork_test);
+		ksft_test_result(fork_test(), "fork_test");
 
 	} else {
-		putstr("# SME support not present\n");
-
+		ksft_print_msg("SME not supported\n");
 		for (i = 0; i < EXPECTED_TESTS; i++) {
-			putstr("ok ");
-			putnum(i);
-			putstr(" skipped\n");
+			ksft_test_result_skip("fork_test\n");
 		}
-
-		tests_skipped += EXPECTED_TESTS;
 	}
 
-	print_summary();
+	ksft_finished();
 
 	return 0;
 }

-- 
2.30.2


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