From patchwork Sun Sep 6 19:29:24 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Cercueil X-Patchwork-Id: 11759679 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 41167618 for ; Sun, 6 Sep 2020 19:30:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 24A8C20C09 for ; Sun, 6 Sep 2020 19:30:31 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=crapouillou.net header.i=@crapouillou.net header.b="VUmf7L24" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726511AbgIFTaa (ORCPT ); Sun, 6 Sep 2020 15:30:30 -0400 Received: from crapouillou.net ([89.234.176.41]:35806 "EHLO crapouillou.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725773AbgIFTa3 (ORCPT ); Sun, 6 Sep 2020 15:30:29 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=crapouillou.net; s=mail; t=1599420588; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=AyGUD/j8DvKbTVq8zvcMLRaB6iYfy1kwUhVCXGle+00=; b=VUmf7L24ZSer5mF5iF3s0d2OSHpShS6bXAIAK4IGK/iuZI07+UL4D3a57SvnwxdWQXFDus JToRAl+ui7DR5rjDLN3ZX0S3Af8bmljXqVplaCJj55QHbveUwsEY67gUax2uoz1bcmcw4t jqoAfnTkLEofb3Z2wsu1zr6phWmQfe8= From: Paul Cercueil To: Thomas Bogendoerfer Cc: "Maciej W . Rozycki" , Paul Burton , Zhou Yanjie , od@zcrc.me, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, Paul Cercueil Subject: [PATCH v3 04/15] MIPS: cpu-probe: ingenic: Fix broken BUG_ON Date: Sun, 6 Sep 2020 21:29:24 +0200 Message-Id: <20200906192935.107086-5-paul@crapouillou.net> In-Reply-To: <20200906192935.107086-1-paul@crapouillou.net> References: <20200906192935.107086-1-paul@crapouillou.net> MIME-Version: 1.0 Sender: linux-mips-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org The previous code was doing: BUG_ON(!__builtin_constant_p(cpu_has_counter) || cpu_has_counter); This only worked as the "cpu_has_counter" macro was overridden in . The default "cpu_has_counter" macro is non-constant, which triggered the BUG_ON() independently of the value returned by the macro. What we want to check here, is that *if* the macro was overridden to a compile-time constant, then must be defined to zero, otherwise it's a bug. So the correct check is: BUG_ON(__builtin_constant_p(cpu_has_counter) && cpu_has_counter); Signed-off-by: Paul Cercueil --- Notes: v2-v3: No change arch/mips/kernel/cpu-probe.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c index a07e66a6e063..6be23f205e74 100644 --- a/arch/mips/kernel/cpu-probe.c +++ b/arch/mips/kernel/cpu-probe.c @@ -2123,7 +2123,7 @@ static inline void cpu_probe_ingenic(struct cpuinfo_mips *c, unsigned int cpu) /* XBurst does not implement the CP0 counter. */ c->options &= ~MIPS_CPU_COUNTER; - BUG_ON(!__builtin_constant_p(cpu_has_counter) || cpu_has_counter); + BUG_ON(__builtin_constant_p(cpu_has_counter) && cpu_has_counter); /* XBurst has virtually tagged icache */ c->icache.flags |= MIPS_CACHE_VTAG;