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=-7.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED 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 64F49C04AB6 for ; Tue, 28 May 2019 11:40:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 385A22070D for ; Tue, 28 May 2019 11:40:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726820AbfE1Lkl (ORCPT ); Tue, 28 May 2019 07:40:41 -0400 Received: from bilbo.ozlabs.org ([203.11.71.1]:47589 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726654AbfE1Lkl (ORCPT ); Tue, 28 May 2019 07:40:41 -0400 Received: from authenticated.ozlabs.org (localhost [127.0.0.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange ECDHE (P-256) server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mail.ozlabs.org (Postfix) with ESMTPSA id 45CsNQ1V3qz9s5c; Tue, 28 May 2019 21:40:38 +1000 (AEST) From: Michael Ellerman To: Mathieu Malaterre Cc: Mathieu Malaterre , Christophe Leroy , Benjamin Herrenschmidt , Paul Mackerras , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2] powerpc/32: sstep: Move variable `rc` within CONFIG_PPC64 sentinels In-Reply-To: <20190312212318.17822-1-malat@debian.org> References: <20190312202008.29681-1-malat@debian.org> <20190312212318.17822-1-malat@debian.org> Date: Tue, 28 May 2019 21:40:34 +1000 Message-ID: <87d0k2q025.fsf@concordia.ellerman.id.au> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Mathieu Malaterre writes: > Fix warnings treated as errors with W=1: > > arch/powerpc/lib/sstep.c:1172:31: error: variable 'rc' set but not used [-Werror=unused-but-set-variable] > > Suggested-by: Christophe Leroy > Signed-off-by: Mathieu Malaterre > --- > v2: as suggested prefer CONFIG_PPC64 sentinel instead of unused keyword I'd rather avoid adding more ifdefs if we can. I think this works? cheers diff --git a/arch/powerpc/lib/sstep.c b/arch/powerpc/lib/sstep.c index 3d33fb509ef4..600b036ddfda 100644 --- a/arch/powerpc/lib/sstep.c +++ b/arch/powerpc/lib/sstep.c @@ -1169,7 +1169,7 @@ static nokprobe_inline int trap_compare(long v1, long v2) int analyse_instr(struct instruction_op *op, const struct pt_regs *regs, unsigned int instr) { - unsigned int opcode, ra, rb, rc, rd, spr, u; + unsigned int opcode, ra, rb, rd, spr, u; unsigned long int imm; unsigned long int val, val2; unsigned int mb, me, sh; @@ -1292,7 +1292,6 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs, rd = (instr >> 21) & 0x1f; ra = (instr >> 16) & 0x1f; rb = (instr >> 11) & 0x1f; - rc = (instr >> 6) & 0x1f; switch (opcode) { #ifdef __powerpc64__ @@ -1307,10 +1306,14 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs, return 1; #ifdef __powerpc64__ - case 4: + case 4: { + unsigned int rc; + if (!cpu_has_feature(CPU_FTR_ARCH_300)) return -1; + rc = (instr >> 6) & 0x1f; + switch (instr & 0x3f) { case 48: /* maddhd */ asm volatile(PPC_MADDHD(%0, %1, %2, %3) : @@ -1336,6 +1339,7 @@ int analyse_instr(struct instruction_op *op, const struct pt_regs *regs, * primary opcode which do not have emulation support yet. */ return -1; + } #endif case 7: /* mulli */