linux-kernel - RE: [PATCH] Fix the race between smp_call

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Date:	Thu, 22 Mar 2012 00:59:40 +0000
From:	"Liu, Chuansheng" <chuansheng.liu@...el.com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Yanmin Zhang <yanmin_zhang@...ux.intel.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>
Subject: RE: [PATCH] Fix the race between smp_call_function and CPU booting

Below is the complete test patch. Just run the simpl_loop_onoffline.sh and simpl_loop_smpcalling.sh concurrently
to reproduce the race.

From: liu chuansheng <chuansheng.liu@...el.com>
Subject: [PATCH] Test scripts to verify the race between CPU booting and smp_call

Signed-off-by: liu chuansheng <chuansheng.liu@...el.com>
---
 drivers/misc/Makefile            |    1 +
 drivers/misc/smp_call_test.c     |   61 ++++++++++++++++++++++++++++++++++++++
 scripts/simpl_loop_onoffline.sh  |    5 +++
 scripts/simpl_loop_smpcalling.sh |    5 +++
 4 files changed, 72 insertions(+), 0 deletions(-)
 create mode 100644 drivers/misc/smp_call_test.c
 create mode 100644 scripts/simpl_loop_onoffline.sh
 create mode 100644 scripts/simpl_loop_smpcalling.sh

diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 571ffd1..003f883 100755
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -59,3 +59,4 @@ obj-$(CONFIG_MID_I2S_DEV)     += mid_i2s_dev/
 obj-$(CONFIG_EMMC_IPANIC)      += emmc_ipanic.o
 obj-$(CONFIG_SCU_LOGGING)      += intel_fabric_logging.o
 obj-$(CONFIG_UUID)     += uuid.o
+obj-y                          += smp_call_test.o
diff --git a/drivers/misc/smp_call_test.c b/drivers/misc/smp_call_test.c
new file mode 100644
index 0000000..95a14fc
--- /dev/null
+++ b/drivers/misc/smp_call_test.c
@@ -0,0 +1,61 @@
+/*
+ * drivers/misc/smp_call_test.c
+ *
+ * Author: chuansheng.liu@...el.com
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/errno.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/device.h>
+#include <linux/types.h>
+#include <linux/delay.h>
+#include <linux/sched.h>
+#include <linux/debugfs.h>
+#include <linux/fs.h>
+#include <linux/proc_fs.h>
+
+static int smp_call_dbg_get(void *data, u64 *val)
+{
+       return 0;
+}
+
+static void smp_call_func(void *info)
+{
+       return;
+}
+
+static int smp_call_dbg_set(void *data, u64 val)
+{
+       smp_call_function(smp_call_func, NULL, 1);
+       printk(KERN_ERR "test smp_call_function\n");
+       return 0;
+}
+
+
+DEFINE_SIMPLE_ATTRIBUTE(smp_call_dbg_fops, smp_call_dbg_get, smp_call_dbg_set, "%llu\n");
+
+
+int __init smp_call_test_init(void)
+{
+       debugfs_create_file("smp_call_test", 0644, NULL, NULL, &smp_call_dbg_fops);
+       return 0;
+}
+
+module_init(smp_call_test_init);
+
diff --git a/scripts/simpl_loop_onoffline.sh b/scripts/simpl_loop_onoffline.sh
new file mode 100644
index 0000000..c2c640d
--- /dev/null
+++ b/scripts/simpl_loop_onoffline.sh
@@ -0,0 +1,5 @@
+while true
+do
+ echo 0 > /sys/devices/system/cpu/cpu1/online
+ echo 1 > /sys/devices/system/cpu/cpu1/online
+done
diff --git a/scripts/simpl_loop_smpcalling.sh b/scripts/simpl_loop_smpcalling.sh
new file mode 100644
index 0000000..37cef74
--- /dev/null
+++ b/scripts/simpl_loop_smpcalling.sh
@@ -0,0 +1,5 @@
+while true
+do
+echo 1 > /sys/kernel/debug/smp_call_test
+usleep 500000
+done
-- 
1.7.0.4

> -----Original Message-----
> From: Peter Zijlstra [mailto:peterz@...radead.org]
> Sent: Wednesday, March 21, 2012 8:26 PM
> To: Liu, Chuansheng
> Cc: linux-kernel@...r.kernel.org; Yanmin Zhang; tglx@...utronix.de
> Subject: RE: [PATCH] Fix the race between smp_call_function and CPU booting
> 
> 
> Can you send me your exact kernel patch (the sysfs knob you use to trigger this)
> and test scripts?
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