From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AB8JxZonNZ6M0NhH2960w3Xw3F8A6Ro2djlVqqWFLXCpaiSaSJGnKB64gY9KdnP61dzqS6ae5Yuv ARC-Seal: i=1; a=rsa-sha256; t=1525941704; cv=none; d=google.com; s=arc-20160816; b=tKJ5Mq7nF5HSFLpOX83GCaRKddvwLsxQXuO6f+t0G3CTtsh7ZyI+b9Ynt+FhXYXV8Z khoSbrOwwER/XKYBrryzgrTB2BZnM+AQjYfIFQu6arjCGBKjLneDrNk+6fJQLZ7tgHXF 0hNGXYtfSsgmiLiuk5u26XoIsrmG9ZZVjw9ycbiWcBLHJhD5m7Hh2632lAdok5ZwkkIQ qR3PRYmLenzC+MPYwdrVl817ewEOeTX3GMFSe3lfjy1RtSw3kSdaSuayNl0e+Ter7ADf 5P9HGIFfFxYdESHAoTDmjlyXclHZt/SdcqhRhvrHxpt+jEwSLfcvy3sbzhOIz4Ah1KAc Fsrw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=user-agent:in-reply-to:content-disposition:mime-version:references :message-id:subject:cc:to:from:date:dkim-signature :arc-authentication-results; bh=pVSPTtiOskpCaBKUUvbktT7zYihHor7vfp1Z60bv67o=; b=wpBKpINEfnhFb4tStp98XTd1ka0akTZ5Z4462hXEVgtWhrRvXLDUsFpqLJHEPbev3D 4dz3hif11jFVfN2O86Yh9Xv3bj/2Mitxu3OURQCHSYEwkb/uCSup44DP96An/KzRpdke BVfLjxezeWeyM5PZGtTul7E0hWk9WXcOxeFn+bPzwmoEOhVlD7oEqKA607uZsz/hFf8e Y/8/wm2dHbmmKd+tugAcDm+fJS60Niy/e3nSNYDQUx6pKwvSwcZgsQn02pKjF9Eg2qIr XcCg6/EzL+Pa3P9kdojXi8iVrZOZvtszdUstVhzLkyq4rzunXKvSkO6wS8bLzclke/3K xdJA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@infradead.org header.s=merlin.20170209 header.b=xmgCWq5c; spf=pass (google.com: best guess record for domain of peterz@infradead.org designates 2001:8b0:10b:1231::1 as permitted sender) smtp.mailfrom=peterz@infradead.org Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=merlin.20170209 header.b=xmgCWq5c; spf=pass (google.com: best guess record for domain of peterz@infradead.org designates 2001:8b0:10b:1231::1 as permitted sender) smtp.mailfrom=peterz@infradead.org Date: Thu, 10 May 2018 10:41:25 +0200 From: Peter Zijlstra To: Josh Poimboeuf Cc: x86@kernel.org, linux-kernel@vger.kernel.org, Randy Dunlap , Arnd Bergmann , Ingo Molnar , Thomas Gleixner , Greg KH , David Laight , damian Subject: Re: [PATCH 3/3] objtool: Support GCC 8 switch tables Message-ID: <20180510084125.GY12217@hirez.programming.kicks-ass.net> References: <60ba92277204856ced0723f7d7ca52c691baace3.1525923412.git.jpoimboe@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <60ba92277204856ced0723f7d7ca52c691baace3.1525923412.git.jpoimboe@redhat.com> User-Agent: Mutt/1.9.5 (2018-04-13) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1600046846156782249?= X-GMAIL-MSGID: =?utf-8?q?1600065848921937638?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On Wed, May 09, 2018 at 10:39:16PM -0500, Josh Poimboeuf wrote: > Add some additional checks to the switch jump table logic. This fixes > the following warnings with GCC 8: > > drivers/block/virtio_blk.o: warning: objtool: virtio_queue_rq()+0x0: stack state mismatch: cfa1=7+8 cfa2=7+72 > net/ipv6/icmp.o: warning: objtool: icmpv6_rcv()+0x0: stack state mismatch: cfa1=7+8 cfa2=7+64 > drivers/usb/core/quirks.o: warning: objtool: quirks_param_set()+0x0: stack state mismatch: cfa1=7+8 cfa2=7+48 > drivers/mtd/nand/raw/nand_hynix.o: warning: objtool: hynix_nand_decode_id()+0x0: stack state mismatch: cfa1=7+8 cfa2=7+24 > drivers/mtd/nand/raw/nand_samsung.o: warning: objtool: samsung_nand_decode_id()+0x0: stack state mismatch: cfa1=7+8 cfa2=7+32 > drivers/gpu/drm/nouveau/nvkm/subdev/top/gk104.o: warning: objtool: gk104_top_oneinit()+0x0: stack state mismatch: cfa1=7+8 cfa2=7+64 Could you maybe detail how the GCC8 switch tables are different? And thus what needed fixing?