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From: Valentin Schneider <valentin.schneider@arm.com>
To: linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com,
	linuxppc-dev@lists.ozlabs.org, linux-kbuild@vger.kernel.org
Cc: Marco Elver <elver@google.com>,
	Michal Marek <michal.lkml@markovi.net>,
	Peter Zijlstra <peterz@infradead.org>,
	Frederic Weisbecker <frederic@kernel.org>,
	Mike Galbraith <efault@gmx.de>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Paul Mackerras <paulus@samba.org>,
	Masahiro Yamada <masahiroy@kernel.org>,
	Ingo Molnar <mingo@kernel.org>,
	Dmitry Vyukov <dvyukov@google.com>
Subject: [PATCH v2 4/5] kscan: Use preemption model accessors
Date: Wed, 10 Nov 2021 20:24:47 +0000	[thread overview]
Message-ID: <20211110202448.4054153-5-valentin.schneider@arm.com> (raw)
In-Reply-To: <20211110202448.4054153-1-valentin.schneider@arm.com>

Per PREEMPT_DYNAMIC, checking CONFIG_PREEMPT doesn't tell you the actual
preemption model of the live kernel. Use the newly-introduced accessors
instead.

Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
---
 kernel/kcsan/kcsan_test.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/kcsan/kcsan_test.c b/kernel/kcsan/kcsan_test.c
index dc55fd5a36fc..14d811eb9a21 100644
--- a/kernel/kcsan/kcsan_test.c
+++ b/kernel/kcsan/kcsan_test.c
@@ -1005,13 +1005,13 @@ static const void *nthreads_gen_params(const void *prev, char *desc)
 	else
 		nthreads *= 2;
 
-	if (!IS_ENABLED(CONFIG_PREEMPT) || !IS_ENABLED(CONFIG_KCSAN_INTERRUPT_WATCHER)) {
+	if (!is_preempt_full() || !IS_ENABLED(CONFIG_KCSAN_INTERRUPT_WATCHER)) {
 		/*
 		 * Without any preemption, keep 2 CPUs free for other tasks, one
 		 * of which is the main test case function checking for
 		 * completion or failure.
 		 */
-		const long min_unused_cpus = IS_ENABLED(CONFIG_PREEMPT_NONE) ? 2 : 0;
+		const long min_unused_cpus = is_preempt_none() ? 2 : 0;
 		const long min_required_cpus = 2 + min_unused_cpus;
 
 		if (num_online_cpus() < min_required_cpus) {
-- 
2.25.1


  parent reply	other threads:[~2021-11-10 20:27 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-10 20:24 [PATCH v2 0/5] preempt: PREEMPT vs PREEMPT_DYNAMIC configs fixup Valentin Schneider
2021-11-10 20:24 ` [PATCH v2 1/5] preempt: Restore preemption model selection configs Valentin Schneider
2021-11-11  8:58   ` Marco Elver
2021-11-10 20:24 ` [PATCH v2 2/5] preempt/dynamic: Introduce preempt mode accessors Valentin Schneider
2021-11-11  3:16   ` Mike Galbraith
2021-11-11  3:35     ` Mike Galbraith
2021-11-11  3:47       ` Mike Galbraith
2021-11-11  3:55         ` Mike Galbraith
2021-11-11  9:36         ` Marco Elver
2021-11-11 10:32           ` Mike Galbraith
2021-11-11 10:56             ` Valentin Schneider
2021-11-11 11:09               ` Mike Galbraith
2021-11-11  8:54   ` Marco Elver
2021-11-11 10:56     ` Valentin Schneider
2021-11-16 13:29   ` Christophe Leroy
2021-11-22 16:37     ` Valentin Schneider
2021-11-10 20:24 ` [PATCH v2 3/5] powerpc: Use preemption model accessors Valentin Schneider
2021-11-11  4:55   ` Michael Ellerman
2021-11-15 15:29     ` Valentin Schneider
2021-11-16 13:41   ` Christophe Leroy
2021-11-22 16:44     ` Valentin Schneider
2021-11-10 20:24 ` Valentin Schneider [this message]
2021-11-11  9:11   ` [PATCH v2 4/5] kscan: " Marco Elver
2021-11-11  9:39     ` Marco Elver
2021-11-11 10:57     ` Valentin Schneider
2021-11-10 20:24 ` [PATCH v2 5/5] ftrace: Use preemption model accessors for trace header printout Valentin Schneider
2021-11-10 20:36   ` Steven Rostedt

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