From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758205Ab2CIQjh (ORCPT ); Fri, 9 Mar 2012 11:39:37 -0500 Received: from mx1.redhat.com ([209.132.183.28]:21053 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758174Ab2CIQjg (ORCPT ); Fri, 9 Mar 2012 11:39:36 -0500 From: Don Zickus To: Cc: Peter Zijlstra , LKML , Don Zickus , Thomas Mingarelli , Wim Van Sebroeck Subject: [PATCH 1/2] watchdog, hpwdt: Remove priority option for NMI callback Date: Fri, 9 Mar 2012 11:37:23 -0500 Message-Id: <1331311044-1120-1-git-send-email-dzickus@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The NMI_UNKNOWN bucket only allows for one function to register to it. The reason for that is because only functions which can not determine if the NMI belongs to them or not should register and would like to assume/swallow any NMI they see. As a result it doesn't make sense to let more than one function like this register. In fact, letting a second function fail allows us to know that more than one function is going to swallow NMIs on the current system. This is better than silently being ignored. Therefore hpwdt's priority mechanism doesn't make sense any more. They will be always first on the NMI_UNKNOWN queue, if they register. Removing this parameter cleans up the code and simplifies things for the next patch which changes how nmis are registered. Cc: Thomas Mingarelli Cc: Wim Van Sebroeck Signed-off-by: Don Zickus --- drivers/watchdog/hpwdt.c | 19 ++++--------------- 1 files changed, 4 insertions(+), 15 deletions(-) diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c index 3c166d3..deee02c8 100644 --- a/drivers/watchdog/hpwdt.c +++ b/drivers/watchdog/hpwdt.c @@ -145,7 +145,6 @@ struct cmn_registers { static unsigned int hpwdt_nmi_decoding; static unsigned int allow_kdump; -static unsigned int priority; /* hpwdt at end of die_notify list */ static unsigned int is_icru; static DEFINE_SPINLOCK(rom_lock); static void *cru_rom_addr; @@ -730,13 +729,9 @@ static int __devinit hpwdt_init_nmi_decoding(struct pci_dev *dev) } /* - * If the priority is set to 1, then we will be put first on the - * die notify list to handle a critical NMI. The default is to - * be last so other users of the NMI signal can function. + * Only one function can register for NMI_UNKNOWN */ - retval = register_nmi_handler(NMI_UNKNOWN, hpwdt_pretimeout, - (priority) ? NMI_FLAG_FIRST : 0, - "hpwdt"); + retval = register_nmi_handler(NMI_UNKNOWN, hpwdt_pretimeout, 0, "hpwdt"); if (retval != 0) { dev_warn(&dev->dev, "Unable to register a die notifier (err=%d).\n", @@ -747,10 +742,8 @@ static int __devinit hpwdt_init_nmi_decoding(struct pci_dev *dev) dev_info(&dev->dev, "HP Watchdog Timer Driver: NMI decoding initialized" - ", allow kernel dump: %s (default = 0/OFF)" - ", priority: %s (default = 0/LAST).\n", - (allow_kdump == 0) ? "OFF" : "ON", - (priority == 0) ? "LAST" : "FIRST"); + ", allow kernel dump: %s (default = 0/OFF)\n", + (allow_kdump == 0) ? "OFF" : "ON"); return 0; } @@ -888,10 +881,6 @@ MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" #ifdef CONFIG_HPWDT_NMI_DECODING module_param(allow_kdump, int, 0); MODULE_PARM_DESC(allow_kdump, "Start a kernel dump after NMI occurs"); - -module_param(priority, int, 0); -MODULE_PARM_DESC(priority, "The hpwdt driver handles NMIs first or last" - " (default = 0/Last)\n"); #endif /* !CONFIG_HPWDT_NMI_DECODING */ module_init(hpwdt_init); -- 1.7.7.6