From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 7FC1660555 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 S932963AbeFFQYP (ORCPT + 25 others); Wed, 6 Jun 2018 12:24:15 -0400 Received: from mga17.intel.com ([192.55.52.151]:61009 "EHLO mga17.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752952AbeFFQXe (ORCPT ); Wed, 6 Jun 2018 12:23:34 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.49,483,1520924400"; d="scan'208";a="62323479" 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 v2 6/8] x86/segments/64: Rename PER_CPU segment to CPU_NUMBER Date: Wed, 6 Jun 2018 09:23:17 -0700 Message-Id: <1528302199-29619-7-git-send-email-chang.seok.bae@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1528302199-29619-1-git-send-email-chang.seok.bae@intel.com> References: <1528302199-29619-1-git-send-email-chang.seok.bae@intel.com> Sender: linux-kernel-owner@vger.kernel.org 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: Andy Lutomirski Cc: Andi Kleen Cc: Dave Hansen Cc: Thomas Gleixner Cc: Ingo Molnar --- 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