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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable 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 CD8ACC433DB for ; Mon, 18 Jan 2021 15:14:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8D42C22BF3 for ; Mon, 18 Jan 2021 15:14:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2393284AbhARPNv (ORCPT ); Mon, 18 Jan 2021 10:13:51 -0500 Received: from mail.kernel.org ([198.145.29.99]:37676 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390379AbhARLmH (ORCPT ); Mon, 18 Jan 2021 06:42:07 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 5235A2223E; Mon, 18 Jan 2021 11:41:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1610970086; bh=gFezr+KIW0FwbmW6quW+HsgiqZDNUoNWDftos+HnCcc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MsjAf+A1BdwGZloSWi+9XOSGgWIkZ/vTaCj7Oib5Or+a3aP6TkK4byb2vUPmwp+GO 8kyL0PAk8bqqtL2s64iCS0PtfDG4IN0s2zpTnhlwtnTZZAO2qVJMg3gSC6JWAqbfZ+ PGUi0e6stO/iUF+i8789LNzJ9ZjZJi2Im3Br4wdo= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Anders Roxell , Nathan Chancellor , Naresh Kamboju , Nick Desaulniers , Thomas Bogendoerfer Subject: [PATCH 5.10 030/152] mips: lib: uncached: fix non-standard usage of variable sp Date: Mon, 18 Jan 2021 12:33:25 +0100 Message-Id: <20210118113354.223625171@linuxfoundation.org> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20210118113352.764293297@linuxfoundation.org> References: <20210118113352.764293297@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Anders Roxell commit 5b058973d3205578aa6c9a71392e072a11ca44ef upstream. When building mips tinyconfig with clang the following warning show up: arch/mips/lib/uncached.c:45:6: warning: variable 'sp' is uninitialized when used here [-Wuninitialized] if (sp >= (long)CKSEG0 && sp < (long)CKSEG2) ^~ arch/mips/lib/uncached.c:40:18: note: initialize the variable 'sp' to silence this warning register long sp __asm__("$sp"); ^ = 0 1 warning generated. Rework to make an explicit inline move, instead of the non-standard use of specifying registers for local variables. This is what's written from the gcc-10 manual [1] about specifying registers for local variables: "6.47.5.2 Specifying Registers for Local Variables ................................................. [...] "The only supported use for this feature is to specify registers for input and output operands when calling Extended 'asm' (*note Extended Asm::). [...]". [1] https://docs.w3cub.com/gcc~10/local-register-variables Signed-off-by: Anders Roxell Reported-by: Nathan Chancellor Reported-by: Naresh Kamboju Reviewed-by: Nick Desaulniers Signed-off-by: Thomas Bogendoerfer Signed-off-by: Greg Kroah-Hartman --- arch/mips/lib/uncached.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/arch/mips/lib/uncached.c +++ b/arch/mips/lib/uncached.c @@ -37,10 +37,12 @@ */ unsigned long run_uncached(void *func) { - register long sp __asm__("$sp"); register long ret __asm__("$2"); long lfunc = (long)func, ufunc; long usp; + long sp; + + __asm__("move %0, $sp" : "=r" (sp)); if (sp >= (long)CKSEG0 && sp < (long)CKSEG2) usp = CKSEG1ADDR(sp);