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[2620:137:e000::1:20]) by mx.google.com with ESMTP id iy19-20020a170903131300b001a6fe422894si8673569plb.200.2023.06.07.06.01.38; Wed, 07 Jun 2023 06:01:56 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@linutronix.de header.s=2020 header.b=vmArIk+A; dkim=neutral (no key) header.i=@linutronix.de header.s=2020e; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=linutronix.de Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238716AbjFGM4D (ORCPT + 99 others); Wed, 7 Jun 2023 08:56:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33984 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235621AbjFGM4B (ORCPT ); Wed, 7 Jun 2023 08:56:01 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5E82A10DE for ; Wed, 7 Jun 2023 05:55:53 -0700 (PDT) From: Thomas Gleixner DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1686142552; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=bO4Cr3xOuSS4p6uSUWgjKuKXxBCfM0OB3C5OihkHED4=; b=vmArIk+AJKtb3HxDDiMaYwdaC++iJozeqxwax4UpIG4VX/LDEMcuG+J8jj3XpbXgLQhUH0 W8irNFkM0qmmQxOUuqdjNEK4f6kLZYLCPbsIo4RMftLAkP1VSOQh9la/iCdo0eFXrAfc4t sizdM/RYlU4nU4lnCaIF29fTyfVZnQkJkhjFr+FsolgwIKa1dYOW3uiNdl+RTp1XSsQ+Ov Pe6wbOcVO3DMy/J/ncZ9/3vN4JkoD6ru3Jqr8HWfTq0Ns9H6XXku4J5C63VR6b8ypK17IC nJbLYXm7KQ+LQpTcKRVaX9LoIik5LSdnl5LCSXCGGWs4lnXTxT2kJLKlzhHWgQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1686142552; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=bO4Cr3xOuSS4p6uSUWgjKuKXxBCfM0OB3C5OihkHED4=; b=yzOZGXRXTxAhDJ8fWqHc/m5At4P9gYrMf11BNvPDv0s5maeBU6NspdPI3/jJxjrBaKoCQk eLrUG8dKK2uxy3AQ== To: Nikolay Borisov , x86@kernel.org Cc: linux-kernel@vger.kernel.org, mhocko@suse.com, jslaby@suse.cz, Nikolay Borisov Subject: Re: [PATCH 3/3] x86: Disable running 32bit processes if ia32_disabled is passed In-Reply-To: <87legvjxat.ffs@tglx> References: <20230607072936.3766231-1-nik.borisov@suse.com> <20230607072936.3766231-4-nik.borisov@suse.com> <87legvjxat.ffs@tglx> Date: Wed, 07 Jun 2023 14:55:51 +0200 Message-ID: <87cz27juso.ffs@tglx> MIME-Version: 1.0 Content-Type: text/plain X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED,SPF_HELO_NONE, SPF_PASS,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jun 07 2023 at 14:01, Thomas Gleixner wrote: > On Wed, Jun 07 2023 at 10:29, Nikolay Borisov wrote: >> @@ -2368,4 +2373,7 @@ void arch_smt_update(void) >> cpu_bugs_smt_update(); >> /* Check whether IPI broadcasting can be enabled */ >> apic_smt_update(); >> + if (ia32_disabled) >> + on_each_cpu(remove_user32cs_from_gdt, NULL, 1); My brain based compiler tells me, that this breaks the 32bit build and the 64bit build with CONFIG_IA32_EMULATION=n. I'm pretty confident that a real compiler will agree.