Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751365AbaGMHIZ (ORCPT ); Sun, 13 Jul 2014 03:08:25 -0400 Received: from primary.scalemp.com ([174.37.253.146]:40846 "EHLO primary.scalemp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751774AbaGMHIS (ORCPT ); Sun, 13 Jul 2014 03:08:18 -0400 X-Greylist: delayed 975 seconds by postgrey-1.27 at vger.kernel.org; Sun, 13 Jul 2014 03:08:18 EDT Message-ID: <53C22C8A.2010406@scalemp.com> Date: Sun, 13 Jul 2014 09:51:54 +0300 From: Oren Twaig User-Agent: Mozilla/5.0 (X11; Linux i686; rv:24.0) Gecko/20100101 Thunderbird/24.5.0 MIME-Version: 1.0 To: Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , David Rientjes , Yoshihiro YUNOMAE , Paul Gortmaker , Jan Kiszka , Andi Kleen , HATAYAMA Daisuke , Richard Weinberger CC: x86@kernel.org, linux-kernel@vger.kernel.org Subject: Ping: Re: [PATCH v2] x86, vsmp: Remove is_vsmp_box() from apic_is_clustered_box() References: <1404036068-11674-1-git-send-email-oren@scalemp.com> <53B8EDA6.5020704@scalemp.com> In-Reply-To: <53B8EDA6.5020704@scalemp.com> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - primary.scalemp.com X-AntiAbuse: Original Domain - vger.kernel.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - scalemp.com X-Get-Message-Sender-Via: primary.scalemp.com: authenticated_id: oren+scalemp.com/only user confirmed/virtual account not confirmed X-Source: X-Source-Args: X-Source-Dir: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org ping On 07/06/2014 09:33 AM, Oren Twaig wrote: > Hi, > > Quick question: As I'm new at this (submitting patches), what is a reasonable > time to wait before ping-ing a patch ? > > Oren. > > On 06/29/2014 01:01 PM, Oren Twaig wrote: >> When a vSMP Foundation box is detected, the function apic_cluster_num() counts >> the number of APIC clusters found. If more than one found, a multi board >> configuration is assumed, and TSC marked as unstable. This behavior is >> incorrect as vSMP Foundation may use processors from single node only, attached >> to memory of other nodes - and such node may have more than one APIC cluster >> (typically any recent intel box has more than single APIC_CLUSTERID(x)). >> >> To fix this, we simply remove the code which detects a vSMP Foundation box and >> affects apic_is_clusted_box() return value. This can be done because later the >> kernel checks by itself if the TSC is stable using the >> check_tsc_sync_[source|target]() functions and marks TSC as unstable if needed. >> >> Acked-by: Shai Fultheim >> Signed-off-by: Oren Twaig >> --- >> diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h >> index 19b0eba..c100694 100644 >> --- a/arch/x86/include/asm/apic.h >> +++ b/arch/x86/include/asm/apic.h >> @@ -85,14 +85,6 @@ static inline bool apic_from_smp_config(void) >> #include >> #endif >> >> -#ifdef CONFIG_X86_64 >> -extern int is_vsmp_box(void); >> -#else >> -static inline int is_vsmp_box(void) >> -{ >> - return 0; >> -} >> -#endif >> extern int setup_profiling_timer(unsigned int); >> >> static inline void native_apic_mem_write(u32 reg, u32 v) >> diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c >> index ad28db7..2b85bb9 100644 >> --- a/arch/x86/kernel/apic/apic.c >> +++ b/arch/x86/kernel/apic/apic.c >> @@ -2451,51 +2451,6 @@ static void apic_pm_activate(void) { } >> >> #ifdef CONFIG_X86_64 >> >> -static int apic_cluster_num(void) >> -{ >> - int i, clusters, zeros; >> - unsigned id; >> - u16 *bios_cpu_apicid; >> - DECLARE_BITMAP(clustermap, NUM_APIC_CLUSTERS); >> - >> - bios_cpu_apicid = early_per_cpu_ptr(x86_bios_cpu_apicid); >> - bitmap_zero(clustermap, NUM_APIC_CLUSTERS); >> - >> - for (i = 0; i < nr_cpu_ids; i++) { >> - /* are we being called early in kernel startup? */ >> - if (bios_cpu_apicid) { >> - id = bios_cpu_apicid[i]; >> - } else if (i < nr_cpu_ids) { >> - if (cpu_present(i)) >> - id = per_cpu(x86_bios_cpu_apicid, i); >> - else >> - continue; >> - } else >> - break; >> - >> - if (id != BAD_APICID) >> - __set_bit(APIC_CLUSTERID(id), clustermap); >> - } >> - >> - /* Problem: Partially populated chassis may not have CPUs in some of >> - * the APIC clusters they have been allocated. Only present CPUs have >> - * x86_bios_cpu_apicid entries, thus causing zeroes in the bitmap. >> - * Since clusters are allocated sequentially, count zeros only if >> - * they are bounded by ones. >> - */ >> - clusters = 0; >> - zeros = 0; >> - for (i = 0; i < NUM_APIC_CLUSTERS; i++) { >> - if (test_bit(i, clustermap)) { >> - clusters += 1 + zeros; >> - zeros = 0; >> - } else >> - ++zeros; >> - } >> - >> - return clusters; >> -} >> - >> static int multi_checked; >> static int multi; >> >> @@ -2540,20 +2495,7 @@ static void dmi_check_multi(void) >> int apic_is_clustered_box(void) >> { >> dmi_check_multi(); >> - if (multi) >> - return 1; >> - >> - if (!is_vsmp_box()) >> - return 0; >> - >> - /* >> - * ScaleMP vSMPowered boxes have one cluster per board and TSCs are >> - * not guaranteed to be synced between boards >> - */ >> - if (apic_cluster_num() > 1) >> - return 1; >> - >> - return 0; >> + return multi; >> } >> #endif >> >> > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/