linux-kernel - Re: [PATCH 06/10] selftests: landlock: Add the uapi headers include variable

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Date:   Tue, 18 Jan 2022 13:35:46 +0100
From:   Mickaël Salaün <mic@...ikod.net>
To:     Muhammad Usama Anjum <usama.anjum@...labora.com>,
        Shuah Khan <shuah@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Darren Hart <dvhart@...radead.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        André Almeida <andrealmeid@...labora.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Mat Martineau <mathew.j.martineau@...ux.intel.com>,
        Matthieu Baerts <matthieu.baerts@...sares.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        chiminghao <chi.minghao@....com.cn>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:KERNEL VIRTUAL MACHINE (KVM)" <kvm@...r.kernel.org>,
        "open list:LANDLOCK SECURITY MODULE" 
        <linux-security-module@...r.kernel.org>,
        "open list:NETWORKING [GENERAL]" <netdev@...r.kernel.org>,
        "open list:NETWORKING [MPTCP]" <mptcp@...ts.linux.dev>,
        "open list:MEMORY MANAGEMENT" <linux-mm@...ck.org>
Cc:     kernel@...labora.com
Subject: Re: [PATCH 06/10] selftests: landlock: Add the uapi headers include
 variable


On 18/01/2022 12:29, Muhammad Usama Anjum wrote:
> Out of tree build of this test fails if relative path of the output
> directory is specified. Remove the un-needed include paths and use
> KHDR_INCLUDES to correctly reach the headers.
> 
> Signed-off-by: Muhammad Usama Anjum <usama.anjum@...labora.com>
> ---
>   tools/testing/selftests/landlock/Makefile | 11 +++--------
>   1 file changed, 3 insertions(+), 8 deletions(-)
> 
> diff --git a/tools/testing/selftests/landlock/Makefile b/tools/testing/selftests/landlock/Makefile
> index a99596ca9882..44c724b38a37 100644
> --- a/tools/testing/selftests/landlock/Makefile
> +++ b/tools/testing/selftests/landlock/Makefile
> @@ -1,6 +1,6 @@
>   # SPDX-License-Identifier: GPL-2.0
>   
> -CFLAGS += -Wall -O2
> +CFLAGS += -Wall -O2 $(KHDR_INCLUDES)
>   
>   src_test := $(wildcard *_test.c)
>   
> @@ -12,13 +12,8 @@ KSFT_KHDR_INSTALL := 1
>   OVERRIDE_TARGETS := 1
>   include ../lib.mk
>   
> -khdr_dir = $(top_srcdir)/usr/include

This should be updated to:
khdr_dir = ${abs_srctree}/usr/include

Using a global KHDR_DIR instead of khdr_dir could be useful for others too.

> -
> -$(khdr_dir)/linux/landlock.h: khdr
> -	@:

This should be kept as is, otherwise we loose this check to rebuild the 
headers if linux/landlock.h is updated, which is handy for development.
KVM lost a similar behavior with this patch series.

> -
>   $(OUTPUT)/true: true.c
>   	$(LINK.c) $< $(LDLIBS) -o $@ -static
>   
> -$(OUTPUT)/%_test: %_test.c $(khdr_dir)/linux/landlock.h ../kselftest_harness.h common.h

This should not be changed.

> -	$(LINK.c) $< $(LDLIBS) -o $@ -lcap -I$(khdr_dir)
> +$(OUTPUT)/%_test: %_test.c ../kselftest_harness.h common.h
> +	$(LINK.c) $< $(LDLIBS) -o $@ -lcap

This doesn't work when building in the local directory because 
$abs_srctree and $KHDR_INCLUDES are empty:
cd tools/testing/selftests/landlock && make