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=-15.8 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 autolearn=ham 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 2965EC48BE8 for ; Fri, 18 Jun 2021 15:24:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F229160FEE for ; Fri, 18 Jun 2021 15:24:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235142AbhFRP1G (ORCPT ); Fri, 18 Jun 2021 11:27:06 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56986 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235206AbhFRPW4 (ORCPT ); Fri, 18 Jun 2021 11:22:56 -0400 Received: from galois.linutronix.de (Galois.linutronix.de [IPv6:2a0a:51c0:0:12e:550::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9538FC0619FB for ; Fri, 18 Jun 2021 08:20:11 -0700 (PDT) Message-Id: <20210618143449.189900842@linutronix.de> DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1624029610; 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: content-transfer-encoding:content-transfer-encoding: references:references; bh=kWvzMiCSpOyqgYOmKiL1zoGy0OnOopUpMNQHtzTBPHc=; b=CyDVaugWO2PC3VyMfth4/t0BL4FKbHYNpDmzIunw3rfFecTBNf99wGI7QIJpE4tbcOXUrR P4VZ+d3tHAAnO7rN0deiuweplczGv5z1tE569TRhs40pj2K+wjNDDh80bSLqmuNVXrD2MC BwTgHwHKdnQ2kanzqenFtokKJyJfwHdCt5py5OfE+MEvqhFF57zFlhdSX8vlbYHALEb3NV 9keuyccPtIr6iyN3NMf0RyWN6dDNqODJzemGzn/Pvrmj/r32YO6OxQgJHU/s6U1hIcCoxd F4VrkKeHbySRYIWyZDHK3U4b4NBSk2d/mGE6mVloJ97ZCQGhVKH/SeBxKSIFCg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1624029610; 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: content-transfer-encoding:content-transfer-encoding: references:references; bh=kWvzMiCSpOyqgYOmKiL1zoGy0OnOopUpMNQHtzTBPHc=; b=AHPBecKGKKxbgnmOxA9zyvZjQsmVL69YlkDipaoaUbpkbFZOcwAwLXEJnZUn9spdagRmNM D3/xQpMxDJyUh4AQ== Date: Fri, 18 Jun 2021 16:19:05 +0200 From: Thomas Gleixner To: LKML Cc: Andy Lutomirski , Dave Hansen , Fenghua Yu , Tony Luck , Yu-cheng Yu , Sebastian Andrzej Siewior , Borislav Petkov , Peter Zijlstra , Kan Liang Subject: [patch V3 42/66] x86/pkru: Provide pkru_get_init_value() References: <20210618141823.161158090@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-transfer-encoding: 8-bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS is disabled then the following code fails to compile: if (cpu_feature_enabled(X86_FEATURE_OSPKE)) { u32 pkru = READ_ONCE(init_pkru_value); .. } because init_pkru_value is defined as '0' which makes READ_ONCE() upset. Provide an accessor macro to avoid #ifdeffery all over the place. Signed-off-by: Thomas Gleixner --- arch/x86/include/asm/pkru.h | 2 ++ 1 file changed, 2 insertions(+) --- a/arch/x86/include/asm/pkru.h +++ b/arch/x86/include/asm/pkru.h @@ -10,8 +10,10 @@ #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS extern u32 init_pkru_value; +#define pkru_get_init_value() READ_ONCE(init_pkru_value) #else #define init_pkru_value 0 +#define pkru_get_init_value() 0 #endif static inline bool __pkru_allows_read(u32 pkru, u16 pkey)