From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from smtp.codeaurora.org by pdx-caf-mail.web.codeaurora.org (Dovecot) with LMTP id jPGjA0JmGVuXDQAAmS7hNA ; Thu, 07 Jun 2018 17:07:32 +0000 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id F2570607E7; Thu, 7 Jun 2018 17:07:31 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on pdx-caf-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI autolearn=ham autolearn_force=no version=3.4.0 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by smtp.codeaurora.org (Postfix) with ESMTP id 66E1560115; Thu, 7 Jun 2018 17:07:31 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 66E1560115 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934651AbeFGRG0 (ORCPT + 25 others); Thu, 7 Jun 2018 13:06:26 -0400 Received: from mga12.intel.com ([192.55.52.136]:32208 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932789AbeFGRGY (ORCPT ); Thu, 7 Jun 2018 13:06:24 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga106.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 07 Jun 2018 10:06:23 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.49,487,1520924400"; d="scan'208";a="206183224" Received: from chang-linux-2.sc.intel.com ([10.3.52.139]) by orsmga004.jf.intel.com with ESMTP; 07 Jun 2018 10:06:23 -0700 From: "Chang S. Bae" To: Andy Lutomirski , "H . Peter Anvin" , Thomas Gleixner , Ingo Molnar Cc: Andi Kleen , Dave Hansen , Markus T Metzger , "Ravi V . Shankar" , "Chang S . Bae" , LKML Subject: [PATCH v3 5/7] x86/segments/64: Rename PER_CPU segment to CPU_NUMBER Date: Thu, 7 Jun 2018 10:06:06 -0700 Message-Id: <1528391168-22224-6-git-send-email-chang.seok.bae@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1528391168-22224-1-git-send-email-chang.seok.bae@intel.com> References: <1528391168-22224-1-git-send-email-chang.seok.bae@intel.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 64-bit doesn't use the entry for per CPU data, but for CPU numbers. The change will clarify the real usage of this entry in GDT. Suggested-by: H. Peter Anvin Signed-off-by: Chang S. Bae Cc: Andi Kleen Cc: Dave Hansen Cc: Thomas Gleixner Cc: Ingo Molnar Acked-by: Andy Lutomirski --- arch/x86/entry/vdso/vma.c | 5 ++++- arch/x86/include/asm/segment.h | 5 ++--- arch/x86/include/asm/vgtod.h | 2 +- 3 files changed, 7 insertions(+), 5 deletions(-) diff --git a/arch/x86/entry/vdso/vma.c b/arch/x86/entry/vdso/vma.c index 5b8b556..833e229 100644 --- a/arch/x86/entry/vdso/vma.c +++ b/arch/x86/entry/vdso/vma.c @@ -359,7 +359,10 @@ static void vgetcpu_cpu_init(void *arg) d.p = 1; /* Present */ d.d = 1; /* 32-bit */ - write_gdt_entry(get_cpu_gdt_rw(cpu), GDT_ENTRY_PER_CPU, &d, DESCTYPE_S); + write_gdt_entry(get_cpu_gdt_rw(cpu), + GDT_ENTRY_CPU_NUMBER, + &d, + DESCTYPE_S); } static int vgetcpu_online(unsigned int cpu) diff --git a/arch/x86/include/asm/segment.h b/arch/x86/include/asm/segment.h index 8f09012b..492e3d1 100644 --- a/arch/x86/include/asm/segment.h +++ b/arch/x86/include/asm/segment.h @@ -186,8 +186,7 @@ #define GDT_ENTRY_TLS_MIN 12 #define GDT_ENTRY_TLS_MAX 14 -/* Abused to load per CPU data from limit */ -#define GDT_ENTRY_PER_CPU 15 +#define GDT_ENTRY_CPU_NUMBER 15 /* * Number of entries in the GDT table: @@ -207,7 +206,7 @@ #define __USER_DS (GDT_ENTRY_DEFAULT_USER_DS*8 + 3) #define __USER32_DS __USER_DS #define __USER_CS (GDT_ENTRY_DEFAULT_USER_CS*8 + 3) -#define __PER_CPU_SEG (GDT_ENTRY_PER_CPU*8 + 3) +#define __CPU_NUMBER_SEG (GDT_ENTRY_CPU_NUMBER*8 + 3) #endif diff --git a/arch/x86/include/asm/vgtod.h b/arch/x86/include/asm/vgtod.h index fb856c9..9cd9036 100644 --- a/arch/x86/include/asm/vgtod.h +++ b/arch/x86/include/asm/vgtod.h @@ -96,7 +96,7 @@ static inline unsigned int __getcpu(void) alternative_io ("lsl %[p],%[seg]", ".byte 0xf3,0x0f,0xc7,0xf8", /* RDPID %eax/rax */ X86_FEATURE_RDPID, - [p] "=a" (p), [seg] "r" (__PER_CPU_SEG)); + [p] "=a" (p), [seg] "r" (__CPU_NUMBER_SEG)); return p; } -- 2.7.4