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 X-Spam-Level: X-Spam-Status: No, score=-8.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8C501C7618F for ; Sun, 28 Jul 2019 23:16:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4DC892077C for ; Sun, 28 Jul 2019 23:16:56 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=embeddedor.com header.i=@embeddedor.com header.b="A4rAWenD" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726308AbfG1XQz (ORCPT ); Sun, 28 Jul 2019 19:16:55 -0400 Received: from gateway34.websitewelcome.com ([192.185.148.142]:14725 "EHLO gateway34.websitewelcome.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726139AbfG1XQy (ORCPT ); Sun, 28 Jul 2019 19:16:54 -0400 Received: from cm16.websitewelcome.com (cm16.websitewelcome.com [100.42.49.19]) by gateway34.websitewelcome.com (Postfix) with ESMTP id 76B0D275C8 for ; Sun, 28 Jul 2019 18:16:53 -0500 (CDT) Received: from gator4166.hostgator.com ([108.167.133.22]) by cmsmtp with SMTP id rsPNhQkxU4FKprsPNhajJp; Sun, 28 Jul 2019 18:16:53 -0500 X-Authority-Reason: nr=8 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=embeddedor.com; s=default; h=Content-Type:MIME-Version:Message-ID:Subject: Cc:To:From:Date:Sender:Reply-To:Content-Transfer-Encoding:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:In-Reply-To:References:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=86XZTQaufMDQruzYVy1gIqXjB4PVGjUo2sh48fKeAsA=; b=A4rAWenDetBFKIVeGlJCyNGtyo zIijEdbaJQVXWvA9uEmheqhnby0Gd7mq0TSglO6C60EuF8Lb2BrxCWT10hOq9I1TRh1ynTK6EYDgC mfzt8pK5jrv3igsIpLXGHARUoib2Yk+QZDGM0FV3i11jmRO/UUDvwLQm4KfTIyqCQBBNdD4JH8IxZ dsqdCNP1hTfcD/eVxo3NQtIfZbdaLUbkQZw+o2K68FR781SbCvAeXtEVZ0QoanFF5PcdxsiUD8rHu /Lj3oXp8izpISe15xCRQ2rS7kQ3cGYc+tejScPnWq48KwF6chzQ9BZyoQ2hvX4txs2/ymkTXmRzUP aep5/ruA==; Received: from [187.192.11.120] (port=39048 helo=embeddedor) by gator4166.hostgator.com with esmtpa (Exim 4.92) (envelope-from ) id 1hrsPM-003WPA-9s; Sun, 28 Jul 2019 18:16:52 -0500 Date: Sun, 28 Jul 2019 18:16:51 -0500 From: "Gustavo A. R. Silva" To: Will Deacon , Mark Rutland , Russell King Cc: linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, "Gustavo A. R. Silva" , Kees Cook , Stephen Rothwell Subject: [PATCH] ARM/hw_breakpoint: Mark expected switch fall-throughs Message-ID: <20190728231651.GA22123@embeddedor> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.9.4 (2018-02-28) X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - gator4166.hostgator.com X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - embeddedor.com X-BWhitelist: no X-Source-IP: 187.192.11.120 X-Source-L: No X-Exim-ID: 1hrsPM-003WPA-9s X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: (embeddedor) [187.192.11.120]:39048 X-Source-Auth: gustavo@embeddedor.com X-Email-Count: 13 X-Source-Cap: Z3V6aWRpbmU7Z3V6aWRpbmU7Z2F0b3I0MTY2Lmhvc3RnYXRvci5jb20= X-Local-Domain: yes Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Mark switch cases where we are expecting to fall through. This patch fixes the following warnings: arch/arm/kernel/hw_breakpoint.c: In function 'hw_breakpoint_arch_parse': arch/arm/kernel/hw_breakpoint.c:609:6: warning: this statement may fall through [-Wimplicit-fallthrough=] if (hw->ctrl.len == ARM_BREAKPOINT_LEN_2) ^ arch/arm/kernel/hw_breakpoint.c:611:2: note: here case 3: ^~~~ arch/arm/kernel/hw_breakpoint.c:613:6: warning: this statement may fall through [-Wimplicit-fallthrough=] if (hw->ctrl.len == ARM_BREAKPOINT_LEN_1) ^ arch/arm/kernel/hw_breakpoint.c:615:2: note: here default: ^~~~~~~ arch/arm/kernel/hw_breakpoint.c: In function 'arch_build_bp_info': arch/arm/kernel/hw_breakpoint.c:544:6: warning: this statement may fall through [-Wimplicit-fallthrough=] if ((hw->ctrl.type != ARM_BREAKPOINT_EXECUTE) ^ arch/arm/kernel/hw_breakpoint.c:547:2: note: here default: ^~~~~~~ In file included from include/linux/kernel.h:11, from include/linux/list.h:9, from include/linux/preempt.h:11, from include/linux/hardirq.h:5, from arch/arm/kernel/hw_breakpoint.c:16: arch/arm/kernel/hw_breakpoint.c: In function 'hw_breakpoint_pending': include/linux/compiler.h:78:22: warning: this statement may fall through [-Wimplicit-fallthrough=] # define unlikely(x) __builtin_expect(!!(x), 0) ^~~~~~~~~~~~~~~~~~~~~~~~~~ include/asm-generic/bug.h:136:2: note: in expansion of macro 'unlikely' unlikely(__ret_warn_on); \ ^~~~~~~~ arch/arm/kernel/hw_breakpoint.c:863:3: note: in expansion of macro 'WARN' WARN(1, "Asynchronous watchpoint exception taken. Debugging results may be unreliable\n"); ^~~~ arch/arm/kernel/hw_breakpoint.c:864:2: note: here case ARM_ENTRY_SYNC_WATCHPOINT: ^~~~ arch/arm/kernel/hw_breakpoint.c: In function 'core_has_os_save_restore': arch/arm/kernel/hw_breakpoint.c:910:6: warning: this statement may fall through [-Wimplicit-fallthrough=] if (oslsr & ARM_OSLSR_OSLM0) ^ arch/arm/kernel/hw_breakpoint.c:912:2: note: here default: ^~~~~~~ Reported-by: Stephen Rothwell Signed-off-by: Gustavo A. R. Silva --- arch/arm/kernel/hw_breakpoint.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/arm/kernel/hw_breakpoint.c b/arch/arm/kernel/hw_breakpoint.c index af8b8e15f589..b0c195e3a06d 100644 --- a/arch/arm/kernel/hw_breakpoint.c +++ b/arch/arm/kernel/hw_breakpoint.c @@ -544,6 +544,7 @@ static int arch_build_bp_info(struct perf_event *bp, if ((hw->ctrl.type != ARM_BREAKPOINT_EXECUTE) && max_watchpoint_len >= 8) break; + /* Else, fall through */ default: return -EINVAL; } @@ -608,10 +609,12 @@ int hw_breakpoint_arch_parse(struct perf_event *bp, /* Allow halfword watchpoints and breakpoints. */ if (hw->ctrl.len == ARM_BREAKPOINT_LEN_2) break; + /* Else, fall through */ case 3: /* Allow single byte watchpoint. */ if (hw->ctrl.len == ARM_BREAKPOINT_LEN_1) break; + /* Else, fall through */ default: ret = -EINVAL; goto out; @@ -861,6 +864,7 @@ static int hw_breakpoint_pending(unsigned long addr, unsigned int fsr, break; case ARM_ENTRY_ASYNC_WATCHPOINT: WARN(1, "Asynchronous watchpoint exception taken. Debugging results may be unreliable\n"); + /* Fall through */ case ARM_ENTRY_SYNC_WATCHPOINT: watchpoint_handler(addr, fsr, regs); break; @@ -909,6 +913,7 @@ static bool core_has_os_save_restore(void) ARM_DBG_READ(c1, c1, 4, oslsr); if (oslsr & ARM_OSLSR_OSLM0) return true; + /* Else, fall through */ default: return false; } -- 2.22.0