From nobody Mon Feb 9 06:48:51 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 35EACEB64DD for ; Tue, 11 Jul 2023 16:11:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233368AbjGKQLV (ORCPT ); Tue, 11 Jul 2023 12:11:21 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45846 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233364AbjGKQLE (ORCPT ); Tue, 11 Jul 2023 12:11:04 -0400 Received: from pegase1.c-s.fr (pegase1.c-s.fr [93.17.236.30]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 774951BC3 for ; Tue, 11 Jul 2023 09:10:45 -0700 (PDT) Received: from localhost (mailhub3.si.c-s.fr [192.168.12.233]) by localhost (Postfix) with ESMTP id 4R0m5T0t1nz9sFN; Tue, 11 Jul 2023 18:09:01 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from pegase1.c-s.fr ([192.168.12.234]) by localhost (pegase1.c-s.fr [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id cb6bd6PfmnXE; Tue, 11 Jul 2023 18:09:01 +0200 (CEST) Received: from messagerie.si.c-s.fr (messagerie.si.c-s.fr [192.168.25.192]) by pegase1.c-s.fr (Postfix) with ESMTP id 4R0m5C5dMsz9sFQ; Tue, 11 Jul 2023 18:08:47 +0200 (CEST) Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id BC9D08B77A; Tue, 11 Jul 2023 18:08:47 +0200 (CEST) X-Virus-Scanned: amavisd-new at c-s.fr Received: from messagerie.si.c-s.fr ([127.0.0.1]) by localhost (messagerie.si.c-s.fr [127.0.0.1]) (amavisd-new, port 10023) with ESMTP id F972A_zmHncX; Tue, 11 Jul 2023 18:08:47 +0200 (CEST) Received: from PO20335.IDSI0.si.c-s.fr (unknown [192.168.233.184]) by messagerie.si.c-s.fr (Postfix) with ESMTP id E0E7D8B781; Tue, 11 Jul 2023 18:08:46 +0200 (CEST) Received: from PO20335.IDSI0.si.c-s.fr (localhost [127.0.0.1]) by PO20335.IDSI0.si.c-s.fr (8.17.1/8.16.1) with ESMTPS id 36BG8k5Y3696856 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NOT); Tue, 11 Jul 2023 18:08:46 +0200 Received: (from chleroy@localhost) by PO20335.IDSI0.si.c-s.fr (8.17.1/8.17.1/Submit) id 36BG8kEP3696855; Tue, 11 Jul 2023 18:08:46 +0200 X-Authentication-Warning: PO20335.IDSI0.si.c-s.fr: chleroy set sender to christophe.leroy@csgroup.eu using -f From: Christophe Leroy To: Michael Ellerman , Nicholas Piggin , Josh Poimboeuf , Peter Zijlstra , Sathvika Vasireddy , Naveen N Rao Cc: Christophe Leroy , linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Subject: [PATCH v4 14/15] powerpc/bug: Annotate reachable after warning trap Date: Tue, 11 Jul 2023 18:08:40 +0200 Message-ID: <1d0c74a6106d5fecfd8f239321ba2da617dee670.1689091394.git.christophe.leroy@csgroup.eu> X-Mailer: git-send-email 2.41.0 In-Reply-To: References: MIME-Version: 1.0 X-Developer-Signature: v=1; a=ed25519-sha256; t=1689091706; l=2316; i=christophe.leroy@csgroup.eu; s=20211009; h=from:subject:message-id; bh=Q4KoEmfRU5YGxWGaGueViyifVjWCMOMZMztPFWckfcQ=; b=Z4VKe0ry8lBipzOg6VJFLZuidr4j8nhCjOrfMebsrUEgIofqyeNOahLy1bn14jlt51SCs83Kn yHDafrf+qqJBxsDAcTnnwuarbxzmXAbOzHiQHatc92yccydDPFtkMA6 X-Developer-Key: i=christophe.leroy@csgroup.eu; a=ed25519; pk=HIzTzUj91asvincQGOFx6+ZF5AoUuP9GdOtQChs7Mm0= Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" This commit is copied from commit bfb1a7c91fb7 ("x86/bug: Merge annotate_reachable() into _BUG_FLAGS() asm") 'twi 31,0,0' is a BUG instruction, which is by default a dead end. But the same instruction is used for WARNINGs and the execution resumes with the following instruction. Mark it reachable so that objtool knows that it is not a dead end in that case. Also change the unreachable() annotation by __builtin_unreachable() since objtool already knows that a BUG instruction is a dead end. Signed-off-by: Christophe Leroy --- arch/powerpc/include/asm/bug.h | 14 ++++++++------ 1 file changed, 8 insertions(+), 6 deletions(-) diff --git a/arch/powerpc/include/asm/bug.h b/arch/powerpc/include/asm/bug.h index abb608dff15a..1c204ee4cc03 100644 --- a/arch/powerpc/include/asm/bug.h +++ b/arch/powerpc/include/asm/bug.h @@ -4,6 +4,7 @@ #ifdef __KERNEL__ =20 #include +#include =20 #ifdef CONFIG_BUG =20 @@ -51,10 +52,11 @@ ".previous\n" #endif =20 -#define BUG_ENTRY(insn, flags, ...) \ +#define BUG_ENTRY(insn, flags, extra, ...) \ __asm__ __volatile__( \ "1: " insn "\n" \ _EMIT_BUG_ENTRY \ + extra \ : : "i" (__FILE__), "i" (__LINE__), \ "i" (flags), \ "i" (sizeof(struct bug_entry)), \ @@ -67,12 +69,12 @@ */ =20 #define BUG() do { \ - BUG_ENTRY("twi 31, 0, 0", 0); \ - unreachable(); \ + BUG_ENTRY("twi 31, 0, 0", 0, ""); \ + __builtin_unreachable(); \ } while (0) #define HAVE_ARCH_BUG =20 -#define __WARN_FLAGS(flags) BUG_ENTRY("twi 31, 0, 0", BUGFLAG_WARNING | (f= lags)) +#define __WARN_FLAGS(flags) BUG_ENTRY("twi 31, 0, 0", BUGFLAG_WARNING | (f= lags), ASM_REACHABLE) =20 #ifdef CONFIG_PPC64 #define BUG_ON(x) do { \ @@ -80,7 +82,7 @@ if (x) \ BUG(); \ } else { \ - BUG_ENTRY(PPC_TLNEI " %4, 0", 0, "r" ((__force long)(x))); \ + BUG_ENTRY(PPC_TLNEI " %4, 0", 0, "", "r" ((__force long)(x))); \ } \ } while (0) =20 @@ -92,7 +94,7 @@ } else { \ BUG_ENTRY(PPC_TLNEI " %4, 0", \ BUGFLAG_WARNING | BUGFLAG_TAINT(TAINT_WARN), \ - "r" (__ret_warn_on)); \ + "", "r" (__ret_warn_on)); \ } \ unlikely(__ret_warn_on); \ }) --=20 2.41.0