From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752157Ab0CRJIl (ORCPT ); Thu, 18 Mar 2010 05:08:41 -0400 Received: from mail-yw0-f201.google.com ([209.85.211.201]:38353 "EHLO mail-yw0-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752000Ab0CRJIW (ORCPT ); Thu, 18 Mar 2010 05:08:22 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:to:cc:subject:date:message-id:x-mailer:in-reply-to:references; b=TRkSMKOL7+ri+AOX4skm0WsNY3t5EB1jWJnIEoWVJJ6nka4wCMtPt93qk91ZuzGVEN l/sNKFVWvrjmRSAPo514ai/6gA7u+Bg4vGpUN9UgQjgUxfrw1qLN6h6Ej6gYUtN6EXbR MAqtFN4Brej2SlO8UE4Uyid4sZZmrmcXtDhKc= From: Akinobu Mita To: linux-kernel@vger.kernel.org, akpm@linux-foundation.org Cc: Akinobu Mita Subject: [PATCH 12/12] add CPU notifier error injection module Date: Thu, 18 Mar 2010 18:05:24 +0900 Message-Id: <1268903124-10237-12-git-send-email-akinobu.mita@gmail.com> X-Mailer: git-send-email 1.6.0.6 In-Reply-To: <1268903124-10237-1-git-send-email-akinobu.mita@gmail.com> References: <1268903124-10237-1-git-send-email-akinobu.mita@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org I used this module to test the series of modification to the cpu notifiers code. Example1: inject CPU offline error (-1 == -EPERM) # modprobe cpu-notifier-error-inject cpu_down_prepare_error=-1 # echo 0 > /sys/devices/system/cpu/cpu1/online0 bash: echo: write error: Operation not permitted Example2: inject CPU online error (-2 == -ENOENT) # modprobe cpu-notifier-error-inject cpu_up_prepare_error=-2 # echo 1 > /sys/devices/system/cpu/cpu1/online0 bash: echo: write error: No such file or directory Signed-off-by: Akinobu Mita --- lib/Kconfig.debug | 12 +++++++ lib/Makefile | 1 + lib/cpu-notifier-error-inject.c | 63 +++++++++++++++++++++++++++++++++++++++ 3 files changed, 76 insertions(+), 0 deletions(-) create mode 100644 lib/cpu-notifier-error-inject.c diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 8e5ec5e..ae467ed 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -885,6 +885,18 @@ config LKDTM Documentation on how to use the module can be found in Documentation/fault-injection/provoke-crashes.txt +config CPU_NOTIFIER_ERROR_INJECT + tristate "CPU notifier error injection module" + depends on HOTPLUG_CPU && DEBUG_KERNEL + help + This option provides a kernel module that can be used to test + the error handling of the cpu notifiers + + To compile this code as a module, choose M here: the module will + be called cpu-notify-inject. + + If unsure, say N. + config FAULT_INJECTION bool "Fault-injection framework" depends on DEBUG_KERNEL diff --git a/lib/Makefile b/lib/Makefile index 2e152ae..9e34be2 100644 --- a/lib/Makefile +++ b/lib/Makefile @@ -82,6 +82,7 @@ obj-$(CONFIG_AUDIT_GENERIC) += audit.o obj-$(CONFIG_SWIOTLB) += swiotlb.o obj-$(CONFIG_IOMMU_HELPER) += iommu-helper.o obj-$(CONFIG_FAULT_INJECTION) += fault-inject.o +obj-$(CONFIG_CPU_NOTIFIER_ERROR_INJECT) += cpu-notifier-error-inject.o lib-$(CONFIG_GENERIC_BUG) += bug.o diff --git a/lib/cpu-notifier-error-inject.c b/lib/cpu-notifier-error-inject.c new file mode 100644 index 0000000..4dc2032 --- /dev/null +++ b/lib/cpu-notifier-error-inject.c @@ -0,0 +1,63 @@ +#include +#include +#include +#include + +static int priority; +static int cpu_up_prepare_error; +static int cpu_down_prepare_error; + +module_param(priority, int, 0); +MODULE_PARM_DESC(priority, "specify cpu notifier priority"); + +module_param(cpu_up_prepare_error, int, 0644); +MODULE_PARM_DESC(cpu_up_prepare_error, + "specify error code to inject CPU_UP_PREPARE action"); + +module_param(cpu_down_prepare_error, int, 0644); +MODULE_PARM_DESC(cpu_down_prepare_error, + "specify error code to inject CPU_DOWN_PREPARE action"); + +static int err_inject_cpu_callback(struct notifier_block *nfb, + unsigned long action, void *hcpu) +{ + int err = 0; + + switch (action) { + case CPU_UP_PREPARE: + case CPU_UP_PREPARE_FROZEN: + err = cpu_up_prepare_error; + break; + case CPU_DOWN_PREPARE: + case CPU_DOWN_PREPARE_FROZEN: + err = cpu_down_prepare_error; + break; + } + if (err) + printk(KERN_INFO "Injecting error (%d) at cpu notifier\n", err); + + return notifier_from_errno(err); +} + +static struct notifier_block err_inject_cpu_notifier = { + .notifier_call = err_inject_cpu_callback, +}; + +static int err_inject_init(void) +{ + err_inject_cpu_notifier.priority = priority; + + return register_hotcpu_notifier(&err_inject_cpu_notifier); +} + +static void err_inject_exit(void) +{ + unregister_hotcpu_notifier(&err_inject_cpu_notifier); +} + +module_init(err_inject_init); +module_exit(err_inject_exit); + +MODULE_DESCRIPTION("CPU notifier error injection module"); +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Akinobu Mita "); -- 1.6.0.6