linux-kernel - [PATCH RFT v16 5/8] selftests/clone3: Remove redundant flushes of output streams

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Message-Id: <20250416-clone3-shadow-stack-v16-5-2ffc9ca3917b@kernel.org>
Date: Wed, 16 Apr 2025 00:31:12 +0100
From: Mark Brown <broonie@...nel.org>
To: "Rick P. Edgecombe" <rick.p.edgecombe@...el.com>, 
 Deepak Gupta <debug@...osinc.com>, Szabolcs Nagy <Szabolcs.Nagy@....com>, 
 "H.J. Lu" <hjl.tools@...il.com>, Florian Weimer <fweimer@...hat.com>, 
 Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, 
 Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>, 
 x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>, 
 Peter Zijlstra <peterz@...radead.org>, Juri Lelli <juri.lelli@...hat.com>, 
 Vincent Guittot <vincent.guittot@...aro.org>, 
 Dietmar Eggemann <dietmar.eggemann@....com>, 
 Steven Rostedt <rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>, 
 Mel Gorman <mgorman@...e.de>, Valentin Schneider <vschneid@...hat.com>, 
 Christian Brauner <brauner@...nel.org>, Shuah Khan <shuah@...nel.org>
Cc: linux-kernel@...r.kernel.org, Catalin Marinas <catalin.marinas@....com>, 
 Will Deacon <will@...nel.org>, jannh@...gle.com, bsegall@...gle.com, 
 Yury Khrustalev <yury.khrustalev@....com>, 
 Wilco Dijkstra <wilco.dijkstra@....com>, linux-kselftest@...r.kernel.org, 
 linux-api@...r.kernel.org, Mark Brown <broonie@...nel.org>, 
 Kees Cook <kees@...nel.org>, Kees Cook <kees@...nel.org>, 
 Shuah Khan <skhan@...uxfoundation.org>
Subject: [PATCH RFT v16 5/8] selftests/clone3: Remove redundant flushes of
 output streams

Since there were widespread issues with output not being flushed the
kselftest framework was modified to explicitly set the output streams
unbuffered in commit 58e2847ad2e6 ("selftests: line buffer test
program's stdout") so there is no need to explicitly flush in the clone3
tests.

Reviewed-by: Kees Cook <kees@...nel.org>
Tested-by: Kees Cook <kees@...nel.org>
Acked-by: Shuah Khan <skhan@...uxfoundation.org>
Reviewed-by: Catalin Marinas <catalin.marinas@....com>
Signed-off-by: Mark Brown <broonie@...nel.org>
---
 tools/testing/selftests/clone3/clone3_selftests.h | 2 --
 1 file changed, 2 deletions(-)

diff --git a/tools/testing/selftests/clone3/clone3_selftests.h b/tools/testing/selftests/clone3/clone3_selftests.h
index eeca8005723f..939b26c86d42 100644
--- a/tools/testing/selftests/clone3/clone3_selftests.h
+++ b/tools/testing/selftests/clone3/clone3_selftests.h
@@ -35,8 +35,6 @@ struct __clone_args {

 static pid_t sys_clone3(struct __clone_args *args, size_t size)
 {
-	fflush(stdout);
-	fflush(stderr);
 	return syscall(__NR_clone3, args, size);
 }

-- 
2.39.5