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[209.132.180.67]) by mx.google.com with ESMTP id o22si4569469ejb.285.2019.10.18.16.35.41; Fri, 18 Oct 2019 16:36:03 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@c-s.fr header.s=mail header.b=DxDL2E1z; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2504488AbfJRGqi (ORCPT + 99 others); Fri, 18 Oct 2019 02:46:38 -0400 Received: from pegase1.c-s.fr ([93.17.236.30]:4012 "EHLO pegase1.c-s.fr" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729874AbfJRGqh (ORCPT ); Fri, 18 Oct 2019 02:46:37 -0400 Received: from localhost (mailhub1-int [192.168.12.234]) by localhost (Postfix) with ESMTP id 46vc575gL6z9tx5X; Fri, 18 Oct 2019 08:46:35 +0200 (CEST) Authentication-Results: localhost; dkim=pass reason="1024-bit key; insecure key" header.d=c-s.fr header.i=@c-s.fr header.b=DxDL2E1z; dkim-adsp=pass; dkim-atps=neutral X-Virus-Scanned: Debian amavisd-new at c-s.fr Received: from pegase1.c-s.fr ([192.168.12.234]) by localhost (pegase1.c-s.fr [192.168.12.234]) (amavisd-new, port 10024) with ESMTP id 5bIBQRCKtIeI; Fri, 18 Oct 2019 08:46:35 +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 46vc573HzLz9tx5W; Fri, 18 Oct 2019 08:46:35 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=c-s.fr; s=mail; t=1571381195; bh=WX90bdaoMzCs8xgA6+HCzypTGmxEze3UiLIKlr3SbAk=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=DxDL2E1zMxM1TWOEpFPlwlooaWacpBagZemhaeBhio5n+GGv9qMDxq16uNOQE26PL k00ZABQ6t1TiRuJiRhsa7L7IE+eV7lgtxBHM9F6YiFJXEXvavOCVzL0sC3179JXwYh l6Sm893qB4b4UcnvtyU7FL31sfNHktTKQ3JuikHA= Received: from localhost (localhost [127.0.0.1]) by messagerie.si.c-s.fr (Postfix) with ESMTP id 68C658B7E5; Fri, 18 Oct 2019 08:46:36 +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 hZxqJFrAxSt1; Fri, 18 Oct 2019 08:46:36 +0200 (CEST) Received: from [192.168.4.90] (unknown [192.168.4.90]) by messagerie.si.c-s.fr (Postfix) with ESMTP id A888B8B7DE; Fri, 18 Oct 2019 08:46:35 +0200 (CEST) Subject: Re: [PATCH v3 06/15] powerpc/32: prepare for CONFIG_VMAP_STACK To: Andrew Donnellan , Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , npiggin@gmail.com, dja@axtens.net Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org References: <7e9771a56539c58dcd8a871c3dfbe7a932e427b0.1568106758.git.christophe.leroy@c-s.fr> From: Christophe Leroy Message-ID: Date: Fri, 18 Oct 2019 08:46:35 +0200 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.9.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: fr Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Le 17/10/2019 à 09:36, Andrew Donnellan a écrit : > On 10/9/19 7:16 pm, Christophe Leroy wrote: >> +#if defined(CONFIG_VMAP_STACK) && CONFIG_THREAD_SHIFT < PAGE_SHIFT >> +#define THREAD_SHIFT        PAGE_SHIFT >> +#else >>   #define THREAD_SHIFT        CONFIG_THREAD_SHIFT >> +#endif >> >>   #define THREAD_SIZE        (1 << THREAD_SHIFT) >> > > Looking at 64-bit book3s: with 64K pages, this results in a THREAD_SIZE > that's too large for immediate mode arithmetic operations, which is > annoying. Hmm. > Which operation are you thinking about ? For instance, 'addi' can't be used anymore, but 'addis' can. Christophe