From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from serv2.oss.ntt.co.jp ([222.151.198.100]) by bombadil.infradead.org with esmtp (Exim 4.76 #1 (Red Hat Linux)) id 1S5WOv-0007Xc-9W for kexec@lists.infradead.org; Thu, 08 Mar 2012 06:00:34 +0000 Message-ID: <4F584AFC.9070300@oss.ntt.co.jp> Date: Thu, 08 Mar 2012 15:00:28 +0900 From: =?UTF-8?B?RmVybmFuZG8gTHVpcyBWw6F6cXVleiBDYW8=?= MIME-Version: 1.0 Subject: Re: [PATCH 2/2] boot: add early NMI counter References: <20120216172735.GX9751@redhat.com> <20120216215603.GH9751@redhat.com> <20120217195430.GO9751@redhat.com> <20120220151419.GU9751@redhat.com> <20120221135934.GF26998@redhat.com> <4F573E1C.2060909@oss.ntt.co.jp> <4F573E74.5040504@oss.ntt.co.jp> <4F573EF0.1080501@oss.ntt.co.jp> In-Reply-To: List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: base64 Content-Type: text/plain; charset="utf-8"; Format="flowed" Sender: kexec-bounces@lists.infradead.org Errors-To: kexec-bounces+dwmw2=infradead.org@lists.infradead.org To: "Eric W. Biederman" Cc: Don Zickus , akpm@linux-foundation.org, linux-tip-commits@vger.kernel.org, Yinghai Lu , kexec@lists.infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, hpa@zytor.com, tglx@linutronix.de, torvalds@linux-foundation.org, mingo@elte.hu, vgoyal@redhat.com T24gMDMvMDgvMjAxMiAwMTo1MCBQTSwgRXJpYyBXLiBCaWVkZXJtYW4gd3JvdGU6Cj4gRmVybmFu ZG8gTHVpcyBWw6F6cXVleiBDYW88ZmVybmFuZG9Ab3NzLm50dC5jby5qcD4gIHdyaXRlczoKPgo+ PiBTdWJqZWN0OiBbUEFUQ0hdIGJvb3Q6IGFkZCBlYXJseSBOTUkgY291bnRlcgo+Pgo+PiBGcm9t OiBGZXJuYW5kbyBMdWlzIFZhenF1ZXogQ2FvPGZlcm5hbmRvQG9zcy5udHQuY28uanA+Cj4+Cj4+ IFdlIGN1cnJlbnRseSBpZ25vcmUgZWFybHkgTk1JcyBidXQgaXQgd291bGQgYmUgbmljZSB0byBi ZSBhYmxlIHRvCj4+IGtub3cgd2hldGhlciB0aGV5IGFjdHVhbGx5IG9jY3VycmVkLgo+Pgo+PiBU aGlzIHBhdGNoIGFkZHMgYW4gZWFybHkgTk1JIGNvdW50ZXIgYW5kIGV4cG9ydHMgaXQgdHJvdWdo Cj4+IC9wcm9jL2ludGVycnVwdHMgd2l0aCB0aGUgbmFtZSBvZiBFTk0gKEVhcmx5IE5NSSkuCj4g Rm9yIGEgdXNlcnNwYWNlIGludGVyZmFjZSBJIHN1c3BlY3Qgd2UganVzdCB3YW50IHRvIGR1bXAg dGhlIGNvdW50Cj4gaW50byB0aGUgTk1JIGNvdW50ZXIuCj4KPiBJdCBwcm9iYWJseSBtYWtlcyBz ZW5zZSB0byBoYXZlIGEgc2VwYXJhdGUgdmFyaWFibGUgaW4gZWFybHkgYm9vdCBsaWtlCj4geW91 IGRvLCBidXQgdGhlbiBhYm91dCB0aGUgdGltZSB3ZSBzZXR1cCB0aGUgbm9ybWFsIE5NSSBoYW5k bGVyIG1vdmUgdGhlCj4gTk1JIGNvdW50IG92ZXIgYW5kIHBvc3NpYmx5IGRvIHNvbWV0aGluZyBs aWtlIHJlYm9vdCBpZiB0aGF0IGlzIG91cgo+IHBvbGljeS4KCkkgYW0gZmluZSB3aXRoIGVpdGhl ciBhcHByb2FjaC4gSSBndWVzcyB0aGF0IGlzIHRoZSB4ODYgbWFpbnRhaW5lcnMnCmNhbGwuIElu Z28sIFRob21hcywgUGV0ZXIsIHdoYXQgZG8geW91IHRoaW5rPyBTaG91bGQgSSBhZGQgYSBuZXcK ZW50cnkgdG8gL3Byb2MvaW50ZXJydXB0cyBvciBtb3ZlIG92ZXIgdGhlIGVhcmx5IE5NSSBjb3Vu dCB0byB0aGUKZXhpc3RpbmcgcGVyLWNwdSBOTUkgY291bnRlcj8KClRoYW5rcywKRmVybmFuZG8K Cl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fCmtleGVjIG1h aWxpbmcgbGlzdAprZXhlY0BsaXN0cy5pbmZyYWRlYWQub3JnCmh0dHA6Ly9saXN0cy5pbmZyYWRl YWQub3JnL21haWxtYW4vbGlzdGluZm8va2V4ZWMK From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752914Ab2CHGAc (ORCPT ); Thu, 8 Mar 2012 01:00:32 -0500 Received: from serv2.oss.ntt.co.jp ([222.151.198.100]:46818 "EHLO serv2.oss.ntt.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751376Ab2CHGAa (ORCPT ); Thu, 8 Mar 2012 01:00:30 -0500 Message-ID: <4F584AFC.9070300@oss.ntt.co.jp> Date: Thu, 08 Mar 2012 15:00:28 +0900 From: =?UTF-8?B?RmVybmFuZG8gTHVpcyBWw6F6cXVleiBDYW8=?= User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:10.0.2) Gecko/20120216 Thunderbird/10.0.2 MIME-Version: 1.0 To: "Eric W. Biederman" CC: Don Zickus , linux-tip-commits@vger.kernel.org, torvalds@linux-foundation.org, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, mingo@redhat.com, tglx@linutronix.de, hpa@zytor.com, mingo@elte.hu, Yinghai Lu , akpm@linux-foundation.org, vgoyal@redhat.com Subject: Re: [PATCH 2/2] boot: add early NMI counter References: <20120216172735.GX9751@redhat.com> <20120216215603.GH9751@redhat.com> <20120217195430.GO9751@redhat.com> <20120220151419.GU9751@redhat.com> <20120221135934.GF26998@redhat.com> <4F573E1C.2060909@oss.ntt.co.jp> <4F573E74.5040504@oss.ntt.co.jp> <4F573EF0.1080501@oss.ntt.co.jp> In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 03/08/2012 01:50 PM, Eric W. Biederman wrote: > Fernando Luis Vázquez Cao writes: > >> Subject: [PATCH] boot: add early NMI counter >> >> From: Fernando Luis Vazquez Cao >> >> We currently ignore early NMIs but it would be nice to be able to >> know whether they actually occurred. >> >> This patch adds an early NMI counter and exports it trough >> /proc/interrupts with the name of ENM (Early NMI). > For a userspace interface I suspect we just want to dump the count > into the NMI counter. > > It probably makes sense to have a separate variable in early boot like > you do, but then about the time we setup the normal NMI handler move the > NMI count over and possibly do something like reboot if that is our > policy. I am fine with either approach. I guess that is the x86 maintainers' call. Ingo, Thomas, Peter, what do you think? Should I add a new entry to /proc/interrupts or move over the early NMI count to the existing per-cpu NMI counter? Thanks, Fernando