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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: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000001, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Le 17/10/2019 =C3=A0 09:36, Andrew Donnellan a =C3=A9crit=C2=A0: > On 10/9/19 7:16 pm, Christophe Leroy wrote: >> +#if defined(CONFIG_VMAP_STACK) && CONFIG_THREAD_SHIFT < PAGE_SHIFT >> +#define THREAD_SHIFT=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 PAGE_S= HIFT >> +#else >> =C2=A0 #define THREAD_SHIFT=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 = CONFIG_THREAD_SHIFT >> +#endif >> >> =C2=A0 #define THREAD_SIZE=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 (= 1 << THREAD_SHIFT) >> >=20 > Looking at 64-bit book3s: with 64K pages, this results in a THREAD_SIZE= =20 > that's too large for immediate mode arithmetic operations, which is=20 > annoying. Hmm. >=20 Which operation are you thinking about ? For instance, 'addi' can't be used anymore, but 'addis' can. Christophe