From nobody Fri Feb 13 14:10:32 2026 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 1E733CE7A88 for ; Sat, 23 Sep 2023 12:20:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231688AbjIWMUb (ORCPT ); Sat, 23 Sep 2023 08:20:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32784 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231592AbjIWMUS (ORCPT ); Sat, 23 Sep 2023 08:20:18 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B8D5519E; Sat, 23 Sep 2023 05:20:11 -0700 (PDT) Date: Sat, 23 Sep 2023 12:20:08 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1695471609; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Kh91L5ZDwFn9HB7mIljVlaeZY3ao0w8gMQ62BPYMZds=; b=fm+fE2VWPeqOyUplDOR7nCqCyzmLXcGxsGivyKoZSF2eHvYFQTKgrKAQvNrSQYG2inlxLw VQCs2tciUE2kUX2agGdCHu1jBu36zVcK3osK732leCQe/Pcw8mkGcO50DimhrF4hwFloWp IqbKBtuI0CN+ZTDAxivv1HZkVKkY8oxyCMzu3X591bgk2JuNdJ1Ohr2WezV91jnW3sx3ks wDeFJrKzaBBeXBGo/gNgHLkPiEs/h/nhUGv+lLSzjrq/A9eqGejlBYUQaLDhlcfKXCrRC+ VaV/+4I+LhGBEbgmYx40xAGVXtmah1kD/NOxMQCabkoudjI+VYckeao8Er9OVA== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1695471609; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Kh91L5ZDwFn9HB7mIljVlaeZY3ao0w8gMQ62BPYMZds=; b=p0+cG3TUBep8ycm2KRkcFcy2yJ4MIM+e/igO7ABMT/iNhOf7G879F9y7KF1HBlN9Dkh4PU gFlHBf9fVcLXc5Aw== From: "tip-bot2 for Josh Poimboeuf" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: x86/bugs] x86/bugs: Remove default case for fully switched enums Cc: Josh Poimboeuf , Ingo Molnar , "Borislav Petkov (AMD)" , x86@kernel.org, linux-kernel@vger.kernel.org In-Reply-To: References: MIME-Version: 1.0 Message-ID: <169547160881.27769.4772445455882672034.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The following commit has been merged into the x86/bugs branch of tip: Commit-ID: 365d8a5f4fe4faa88a813b849ea8eac58645289b Gitweb: https://git.kernel.org/tip/365d8a5f4fe4faa88a813b849ea8eac58= 645289b Author: Josh Poimboeuf AuthorDate: Mon, 04 Sep 2023 22:04:58 -07:00 Committer: Ingo Molnar CommitterDate: Sat, 23 Sep 2023 14:13:03 +02:00 x86/bugs: Remove default case for fully switched enums For enum switch statements which handle all possible cases, remove the default case so a compiler warning gets printed if one of the enums gets accidentally omitted from the switch statement. Signed-off-by: Josh Poimboeuf Signed-off-by: Ingo Molnar Acked-by: Borislav Petkov (AMD) Link: https://lore.kernel.org/r/fcf6feefab991b72e411c2aed688b18e65e06aed.16= 93889988.git.jpoimboe@kernel.org --- arch/x86/kernel/cpu/bugs.c | 17 +++++++---------- 1 file changed, 7 insertions(+), 10 deletions(-) diff --git a/arch/x86/kernel/cpu/bugs.c b/arch/x86/kernel/cpu/bugs.c index 4f1ad23..941ac94 100644 --- a/arch/x86/kernel/cpu/bugs.c +++ b/arch/x86/kernel/cpu/bugs.c @@ -1019,7 +1019,6 @@ static void __init retbleed_select_mitigation(void) =20 do_cmd_auto: case RETBLEED_CMD_AUTO: - default: if (boot_cpu_data.x86_vendor =3D=3D X86_VENDOR_AMD || boot_cpu_data.x86_vendor =3D=3D X86_VENDOR_HYGON) { if (IS_ENABLED(CONFIG_CPU_UNRET_ENTRY)) @@ -1290,6 +1289,8 @@ spectre_v2_user_select_mitigation(void) =20 spectre_v2_user_ibpb =3D mode; switch (cmd) { + case SPECTRE_V2_USER_CMD_NONE: + break; case SPECTRE_V2_USER_CMD_FORCE: case SPECTRE_V2_USER_CMD_PRCTL_IBPB: case SPECTRE_V2_USER_CMD_SECCOMP_IBPB: @@ -1301,8 +1302,6 @@ spectre_v2_user_select_mitigation(void) case SPECTRE_V2_USER_CMD_SECCOMP: static_branch_enable(&switch_mm_cond_ibpb); break; - default: - break; } =20 pr_info("mitigation: Enabling %s Indirect Branch Prediction Barrier\n", @@ -2160,6 +2159,10 @@ static int l1d_flush_prctl_get(struct task_struct *t= ask) static int ssb_prctl_get(struct task_struct *task) { switch (ssb_mode) { + case SPEC_STORE_BYPASS_NONE: + if (boot_cpu_has_bug(X86_BUG_SPEC_STORE_BYPASS)) + return PR_SPEC_ENABLE; + return PR_SPEC_NOT_AFFECTED; case SPEC_STORE_BYPASS_DISABLE: return PR_SPEC_DISABLE; case SPEC_STORE_BYPASS_SECCOMP: @@ -2171,11 +2174,8 @@ static int ssb_prctl_get(struct task_struct *task) if (task_spec_ssb_disable(task)) return PR_SPEC_PRCTL | PR_SPEC_DISABLE; return PR_SPEC_PRCTL | PR_SPEC_ENABLE; - default: - if (boot_cpu_has_bug(X86_BUG_SPEC_STORE_BYPASS)) - return PR_SPEC_ENABLE; - return PR_SPEC_NOT_AFFECTED; } + BUG(); } =20 static int ib_prctl_get(struct task_struct *task) @@ -2504,9 +2504,6 @@ static void __init srso_select_mitigation(void) pr_err("WARNING: kernel not compiled with CPU_SRSO.\n"); } break; - - default: - break; } =20 out: