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 4CCFBC6FD1D for ; Wed, 15 Mar 2023 12:31:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232605AbjCOMbb (ORCPT ); Wed, 15 Mar 2023 08:31:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39600 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232623AbjCOMbM (ORCPT ); Wed, 15 Mar 2023 08:31:12 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2377B51C87 for ; Wed, 15 Mar 2023 05:30:16 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id BDBC6B81E0A for ; Wed, 15 Mar 2023 12:30:14 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1A839C4339B; Wed, 15 Mar 2023 12:30:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1678883413; bh=TBlpEnTSCU3V6LeGvXbRTeA8LzZEfDzjzls42LkK9sc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZxFiOhkN5J48Saerj0xUGcLCBNvHWRiVjpkF/ga4PnN+RxJwo/xDYjMnETfuhGRxD ikCbM8ANhMNOHvz7PnC8rnzezoTRfzH66Ab9/Y+yttMDXx5BZwAX4xSDeVtKi9sbRv nvvWtTEmGzEt0eivaZCu9mheOGblfguyOlVqQQQs= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Christophe Leroy , Michael Ellerman , Sasha Levin Subject: [PATCH 5.15 107/145] powerpc: Check !irq instead of irq == NO_IRQ and remove NO_IRQ Date: Wed, 15 Mar 2023 13:12:53 +0100 Message-Id: <20230315115742.506375747@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230315115738.951067403@linuxfoundation.org> References: <20230315115738.951067403@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Christophe Leroy [ Upstream commit bab537805a10bdbf55b31324ba4a9599e0651e5e ] NO_IRQ is a relic from the old days. It is not used anymore in core functions. By the way, function irq_of_parse_and_map() returns value 0 on error. In some drivers, NO_IRQ is erroneously used to check the return of irq_of_parse_and_map(). It is not a real bug today because the only architectures using the drivers being fixed by this patch define NO_IRQ as 0, but there are architectures which define NO_IRQ as -1. If one day those architectures start using the non fixed drivers, there will be a problem. Long time ago Linus advocated for not using NO_IRQ, see https://lore.kernel.org/all/Pine.LNX.4.64.0511211150040.13959@g5.osdl.org He re-iterated the same view recently in https://lore.kernel.org/all/CAHk-=wg2Pkb9kbfbstbB91AJA2SF6cySbsgHG-iQMq56j3VTcA@mail.gmail.com So test !irq instead of tesing irq == NO_IRQ. All other usage of NO_IRQ for powerpc were removed in previous cycles so the time has come to remove NO_IRQ completely for powerpc. Signed-off-by: Christophe Leroy Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/4b8d4f96140af01dec3a3330924dda8b2451c316.1674476798.git.christophe.leroy@csgroup.eu Signed-off-by: Sasha Levin --- arch/powerpc/include/asm/irq.h | 3 --- arch/powerpc/platforms/44x/fsp2.c | 2 +- 2 files changed, 1 insertion(+), 4 deletions(-) diff --git a/arch/powerpc/include/asm/irq.h b/arch/powerpc/include/asm/irq.h index 2b3278534bc14..858393f7fd7d7 100644 --- a/arch/powerpc/include/asm/irq.h +++ b/arch/powerpc/include/asm/irq.h @@ -16,9 +16,6 @@ extern atomic_t ppc_n_lost_interrupts; -/* This number is used when no interrupt has been assigned */ -#define NO_IRQ (0) - /* Total number of virq in the platform */ #define NR_IRQS CONFIG_NR_IRQS diff --git a/arch/powerpc/platforms/44x/fsp2.c b/arch/powerpc/platforms/44x/fsp2.c index 823397c802def..f8bbe05d9ef29 100644 --- a/arch/powerpc/platforms/44x/fsp2.c +++ b/arch/powerpc/platforms/44x/fsp2.c @@ -205,7 +205,7 @@ static void node_irq_request(const char *compat, irq_handler_t errirq_handler) for_each_compatible_node(np, NULL, compat) { irq = irq_of_parse_and_map(np, 0); - if (irq == NO_IRQ) { + if (!irq) { pr_err("device tree node %pOFn is missing a interrupt", np); of_node_put(np); -- 2.39.2