linux-kernel - Re: [PATCH] selftests/landlock: fix broken include of linux/landlock.h

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Date:   Thu, 4 Aug 2022 12:36:13 +0200
From:   Mickaël Salaün <mic@...ikod.net>
To:     Guillaume Tucker <guillaume.tucker@...labora.com>,
        Guillaume <guillaume.tucker@...il.com>,
        Shuah Khan <shuah@...nel.org>
Cc:     Anders Roxell <anders.roxell@...aro.org>, Tim.Bird@...y.com,
        kernel@...labora.com, linux-kernel@...r.kernel.org,
        linux-kselftest@...r.kernel.org,
        linux-security-module@...r.kernel.org
Subject: Re: [PATCH] selftests/landlock: fix broken include of
 linux/landlock.h


On 03/08/2022 22:13, Guillaume Tucker wrote:
> Revert part of the earlier changes to fix the kselftest build when
> using a sub-directory from the top of the tree as this broke the
> landlock test build as a side-effect when building with "make -C
> tools/testing/selftests/landlock".
> 
> Reported-by: Mickaël Salaün <mic@...ikod.net>
> Fixes: a917dd94b832 ("selftests/landlock: drop deprecated headers dependency")
> Fixes: f2745dc0ba3d ("selftests: stop using KSFT_KHDR_INSTALL")
> Signed-off-by: Guillaume Tucker <guillaume.tucker@...labora.com>
> ---
>   tools/testing/selftests/landlock/Makefile | 7 +++++--
>   1 file changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/testing/selftests/landlock/Makefile b/tools/testing/selftests/landlock/Makefile
> index a6959df28eb0..02868ac3bc71 100644
> --- a/tools/testing/selftests/landlock/Makefile
> +++ b/tools/testing/selftests/landlock/Makefile
> @@ -9,10 +9,13 @@ TEST_GEN_PROGS := $(src_test:.c=)
>   TEST_GEN_PROGS_EXTENDED := true
>   
>   OVERRIDE_TARGETS := 1
> +top_srcdir := ../../../..

Not sure it changes much, but most other selftests Makefiles use 
"top_srcdir = ../../../.." (without ":="). Why this change?


>   include ../lib.mk
>   
> +khdr_dir = $(top_srcdir)/usr/include
> +
>   $(OUTPUT)/true: true.c
>   	$(LINK.c) $< $(LDLIBS) -o $@ -static
>   
> -$(OUTPUT)/%_test: %_test.c ../kselftest_harness.h common.h
> -	$(LINK.c) $< $(LDLIBS) -o $@ -lcap
> +$(OUTPUT)/%_test: %_test.c $(khdr_dir)/linux/landlock.h ../kselftest_harness.h common.h
> +	$(LINK.c) $< $(LDLIBS) -o $@ -lcap -I$(khdr_dir)