Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754506AbdIGHmq (ORCPT ); Thu, 7 Sep 2017 03:42:46 -0400 Received: from mx1.redhat.com ([209.132.183.28]:48482 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754443AbdIGHmo (ORCPT ); Thu, 7 Sep 2017 03:42:44 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 578AE4A70A Authentication-Results: ext-mx09.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx09.extmail.prod.ext.phx2.redhat.com; spf=fail smtp.mailfrom=bhe@redhat.com From: Baoquan He To: linux-kernel@vger.kernel.org, x86@kernel.org Cc: mingo@redhat.com, tglx@linutronix.de, hpa@zytor.com, thgarnie@google.com, keescook@chromium.org, akpm@linux-foundation.org, yamada.masahiro@socionext.com, rja@hpe.com, frank.ramsay@hpe.com, Baoquan He Subject: [PATCH v2 RESEND 1/2] x86/UV: Introduce a helper function to check UV system at earlier stage Date: Thu, 7 Sep 2017 15:42:29 +0800 Message-Id: <1504770150-25456-2-git-send-email-bhe@redhat.com> In-Reply-To: <1504770150-25456-1-git-send-email-bhe@redhat.com> References: <1504770150-25456-1-git-send-email-bhe@redhat.com> X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.38]); Thu, 07 Sep 2017 07:42:44 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1425 Lines: 41 The BIOS on SGI UV system will report a UV system table which describes specific firmware capabilities available to the Linux kernel at runtime. This UV system table only exists on SGI UV system. And it's detected in efi_init() which is at very early stage. So introduce a new helper function is_early_uv_system() to identify if a system is UV system. Later we will use it to check if the running system is UV system in mm KASLR code. Signed-off-by: Baoquan He Acked-by: Mike Travis --- arch/x86/include/asm/uv/uv.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/x86/include/asm/uv/uv.h b/arch/x86/include/asm/uv/uv.h index b5a32231abd8..93d7ad8763ba 100644 --- a/arch/x86/include/asm/uv/uv.h +++ b/arch/x86/include/asm/uv/uv.h @@ -18,6 +18,11 @@ extern void uv_nmi_init(void); extern void uv_system_init(void); extern const struct cpumask *uv_flush_tlb_others(const struct cpumask *cpumask, const struct flush_tlb_info *info); +#include +static inline int is_early_uv_system(void) +{ + return !((efi.uv_systab == EFI_INVALID_TABLE_ADDR) || !efi.uv_systab); +} #else /* X86_UV */ @@ -30,6 +35,7 @@ static inline const struct cpumask * uv_flush_tlb_others(const struct cpumask *cpumask, const struct flush_tlb_info *info) { return cpumask; } +static inline int is_early_uv_system(void) { return 0; } #endif /* X86_UV */ -- 2.5.5