linux-kernel - [PATCH] selftests/riscv: fix potential build failure during the "emit

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Date:   Wed, 12 Jul 2023 12:35:14 -0700
From:   John Hubbard <jhubbard@...dia.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
CC:     Albert Ou <aou@...s.berkeley.edu>,
        Alexandre Ghiti <alexghiti@...osinc.com>,
        Anders Roxell <anders.roxell@...aro.org>,
        "Andrew Jones" <ajones@...tanamicro.com>,
        Andy Chiu <andy.chiu@...ive.com>,
        Evan Green <evan@...osinc.com>,
        Hugh Dickins <hughd@...gle.com>,
        Muhammad Usama Anjum <usama.anjum@...labora.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        "Paul Walmsley" <paul.walmsley@...ive.com>,
        Qinglin Pan <panqinglin2020@...as.ac.cn>,
        Shuah Khan <shuah@...nel.org>,
        <linux-kselftest@...r.kernel.org>,
        <linux-riscv@...ts.infradead.org>, <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        John Hubbard <jhubbard@...dia.com>
Subject: [PATCH] selftests/riscv: fix potential build failure during the "emit_tests" step

The riscv selftests (which were modeled after the arm64 selftests) are
improperly declaring the "emit_tests" target to depend upon the "all"
target. This approach, when combined with commit 9fc96c7c19df
("selftests: error out if kernel header files are not yet built"), has
caused build failures [1] on arm64, and is likely to cause similar
failures for riscv.

To fix this, simply remove the unnecessary "all" dependency from the
emit_tests target. The dependency is still effectively honored, because
again, invocation is via "install", which also depends upon "all".

An alternative approach would be to harden the emit_tests target so that
it can depend upon "all", but that's a lot more complicated and hard to
get right, and doesn't seem worth it, especially given that emit_tests
should probably not be overridden at all.

[1] https://lore.kernel.org/20230710-kselftest-fix-arm64-v1-1-48e872844f25@kernel.org

Fixes: 9fc96c7c19df ("selftests: error out if kernel header files are not yet built")
Signed-off-by: John Hubbard <jhubbard@...dia.com>
---

Andrew,

With this, and with my arm64 fix [2] that you've already put into
mm-unstable, you should be able to safely drop commit 819187ab8741
("selftests: fix arm64 test installation").

[2] https://lore.kernel.org/20230711005629.2547838-1-jhubbard@nvidia.com

thanks,
John Hubbard

 tools/testing/selftests/riscv/Makefile | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/riscv/Makefile b/tools/testing/selftests/riscv/Makefile
index 9dd629cc86aa..f4b3d5c9af5b 100644
--- a/tools/testing/selftests/riscv/Makefile
+++ b/tools/testing/selftests/riscv/Makefile
@@ -43,7 +43,7 @@ run_tests: all
 	done

 # Avoid any output on non riscv on emit_tests
-emit_tests: all
+emit_tests:
 	@for DIR in $(RISCV_SUBTARGETS); do				\
 		BUILD_TARGET=$(OUTPUT)/$$DIR;			\
 		$(MAKE) OUTPUT=$$BUILD_TARGET -C $$DIR $@;		\

base-commit: 3f01e9fed8454dcd89727016c3e5b2fbb8f8e50c
prerequisite-patch-id: 37c92f7425689ff069fb83996a25cd98e78d7242
-- 
2.41.0