From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EE55AC433EF for ; Tue, 1 Mar 2022 18:30:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234327AbiCASbS (ORCPT ); Tue, 1 Mar 2022 13:31:18 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54158 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232479AbiCASbQ (ORCPT ); Tue, 1 Mar 2022 13:31:16 -0500 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 53581DEDD for ; Tue, 1 Mar 2022 10:30:35 -0800 (PST) Date: Tue, 1 Mar 2022 19:30:32 +0100 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1646159433; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type; bh=X/igFnMcoOX+ydXY9MUnlr0F1iHCWfAGr8xhEWYL6WE=; b=HQWwZEwuugW2+rq5sKc02C0vnXM6Q/bO48uFSAI8sEU9vOc7Y1QR3evbhzpXApf6Y6nRMW Od5ApdEx5aawtviTZFdsljr0FPjSTQZTBnaSjtBALqVLIx6uqhSwmZ6B3p+Fi4xm54rO/4 ucKcOqSrBKaQIwj5PVxBizX7cq9hr3a6WdJBvScmI6syicfzgs/C2m1hA6zqI62PsdUdFG 5WeqM6pYXLGWymBHwCUiCkaGXZpngwXzR0qquobbjsclynCQId2NHwtMNuWBKzwgLdgqci eANAy6q6OwYF99+wn8E90MEtvI1RsbtFLiDjLBgPjHLe35OgMs5wn324hQY6vQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1646159433; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type; bh=X/igFnMcoOX+ydXY9MUnlr0F1iHCWfAGr8xhEWYL6WE=; b=nolF4nj6/9ks17p52HZyda3SYrlti8KaEWjBXcfw+0+PCGL99jyaye+DeZ8xqSTPQ7sM5n TZ5WdlP0ItvH7VCg== From: Sebastian Andrzej Siewior To: linux-kernel@vger.kernel.org Cc: Ben Segall , Daniel Bristot de Oliveira , Dietmar Eggemann , Ingo Molnar , Juri Lelli , Mel Gorman , Peter Zijlstra , Steven Rostedt , Thomas Gleixner , Vincent Guittot Subject: [PATCH] sched: Make preempt_enable_no_resched() behave like preempt_enable() on PREEMPT_RT Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Thomas Gleixner Use the distinction that has been made earlier between preempt_enable_no_resched() and sched_preempt_enable_no_resched(). sched_preempt_enable_no_resched() is used within the scheduler where an immediate schedule() follows. preempt_enable_no_resched() is used outside of the scheduler and an immediate schedule() invocation may not follow for other reasons. The lack of an immediate schedule() invocation matters on PREEMPT_RT where it will introduce latencies while the scheduler expects a context switch. Signed-off-by: Thomas Gleixner Signed-off-by: Sebastian Andrzej Siewior --- include/linux/preempt.h | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff --git a/include/linux/preempt.h b/include/linux/preempt.h index b4381f255a5ca..582e43856a532 100644 --- a/include/linux/preempt.h +++ b/include/linux/preempt.h @@ -210,7 +210,11 @@ do { \ preempt_count_dec(); \ } while (0) -#define preempt_enable_no_resched() sched_preempt_enable_no_resched() +#ifdef CONFIG_PREEMPT_RT +# define preempt_enable_no_resched() preempt_enable() +#else +# define preempt_enable_no_resched() sched_preempt_enable_no_resched() +#endif #define preemptible() (preempt_count() == 0 && !irqs_disabled()) -- 2.35.1