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-rw-r--r--Documentation/ABI/testing/sysfs-devices-system-cpu12
-rw-r--r--drivers/base/bus.c8
-rw-r--r--drivers/base/core.c9
-rw-r--r--drivers/base/cpu.c14
-rw-r--r--drivers/base/platform.c24
-rw-r--r--fs/sysfs/dir.c17
-rw-r--r--include/linux/device.h12
-rw-r--r--include/linux/platform_device.h25
-rw-r--r--kernel/rtmutex-tester.c4
9 files changed, 73 insertions, 52 deletions
diff --git a/Documentation/ABI/testing/sysfs-devices-system-cpu b/Documentation/ABI/testing/sysfs-devices-system-cpu
index 9c978dc..2447698 100644
--- a/Documentation/ABI/testing/sysfs-devices-system-cpu
+++ b/Documentation/ABI/testing/sysfs-devices-system-cpu
@@ -173,3 +173,15 @@ Description: Processor frequency boosting control
Boosting allows the CPU and the firmware to run at a frequency
beyound it's nominal limit.
More details can be found in Documentation/cpu-freq/boost.txt
+
+
+What: /sys/devices/system/cpu/cpu#/crash_notes
+ /sys/devices/system/cpu/cpu#/crash_notes_size
+Date: April 2013
+Contact: kexec@lists.infradead.org
+Description: address and size of the percpu note.
+
+ crash_notes: the physical address of the memory that holds the
+ note of cpu#.
+
+ crash_notes_size: size of the note of cpu#.
diff --git a/drivers/base/bus.c b/drivers/base/bus.c
index 519865b..8a00dec 100644
--- a/drivers/base/bus.c
+++ b/drivers/base/bus.c
@@ -898,18 +898,18 @@ static ssize_t bus_uevent_store(struct bus_type *bus,
static BUS_ATTR(uevent, S_IWUSR, NULL, bus_uevent_store);
/**
- * __bus_register - register a driver-core subsystem
+ * bus_register - register a driver-core subsystem
* @bus: bus to register
- * @key: lockdep class key
*
* Once we have that, we register the bus with the kobject
* infrastructure, then register the children subsystems it has:
* the devices and drivers that belong to the subsystem.
*/
-int __bus_register(struct bus_type *bus, struct lock_class_key *key)
+int bus_register(struct bus_type *bus)
{
int retval;
struct subsys_private *priv;
+ struct lock_class_key *key = &bus->lock_key;
priv = kzalloc(sizeof(struct subsys_private), GFP_KERNEL);
if (!priv)
@@ -981,7 +981,7 @@ out:
bus->p = NULL;
return retval;
}
-EXPORT_SYMBOL_GPL(__bus_register);
+EXPORT_SYMBOL_GPL(bus_register);
/**
* bus_unregister - remove a bus from the system
diff --git a/drivers/base/core.c b/drivers/base/core.c
index 56536f4b0..a7391a3 100644
--- a/drivers/base/core.c
+++ b/drivers/base/core.c
@@ -563,8 +563,15 @@ int device_create_file(struct device *dev,
const struct device_attribute *attr)
{
int error = 0;
- if (dev)
+
+ if (dev) {
+ WARN(((attr->attr.mode & S_IWUGO) && !attr->store),
+ "Write permission without 'store'\n");
+ WARN(((attr->attr.mode & S_IRUGO) && !attr->show),
+ "Read permission without 'show'\n");
error = sysfs_create_file(&dev->kobj, &attr->attr);
+ }
+
return error;
}
diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index fb10728..a55b590 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -132,6 +132,17 @@ static ssize_t show_crash_notes(struct device *dev, struct device_attribute *att
return rc;
}
static DEVICE_ATTR(crash_notes, 0400, show_crash_notes, NULL);
+
+static ssize_t show_crash_notes_size(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ ssize_t rc;
+
+ rc = sprintf(buf, "%lu\n", sizeof(note_buf_t));
+ return rc;
+}
+static DEVICE_ATTR(crash_notes_size, 0400, show_crash_notes_size, NULL);
#endif
/*
@@ -259,6 +270,9 @@ int __cpuinit register_cpu(struct cpu *cpu, int num)
#ifdef CONFIG_KEXEC
if (!error)
error = device_create_file(&cpu->dev, &dev_attr_crash_notes);
+ if (!error)
+ error = device_create_file(&cpu->dev,
+ &dev_attr_crash_notes_size);
#endif
return error;
}
diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index c0b8df3..9eda842 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -46,8 +46,8 @@ EXPORT_SYMBOL_GPL(platform_bus);
* manipulate any relevant information in the pdev_archdata they can do:
*
* platform_device_alloc()
- * ... manipulate ...
- * platform_device_add()
+ * ... manipulate ...
+ * platform_device_add()
*
* And if they don't care they can just call platform_device_register() and
* everything will just work out.
@@ -326,9 +326,7 @@ int platform_device_add(struct platform_device *pdev)
}
if (p && insert_resource(p, r)) {
- printk(KERN_ERR
- "%s: failed to claim resource %d\n",
- dev_name(&pdev->dev), i);
+ dev_err(&pdev->dev, "failed to claim resource %d\n", i);
ret = -EBUSY;
goto failed;
}
@@ -555,7 +553,8 @@ EXPORT_SYMBOL_GPL(platform_driver_unregister);
/**
* platform_driver_probe - register driver for non-hotpluggable device
* @drv: platform driver structure
- * @probe: the driver probe routine, probably from an __init section
+ * @probe: the driver probe routine, probably from an __init section,
+ * must not return -EPROBE_DEFER.
*
* Use this instead of platform_driver_register() when you know the device
* is not hotpluggable and has already been registered, and you want to
@@ -566,6 +565,9 @@ EXPORT_SYMBOL_GPL(platform_driver_unregister);
* into system-on-chip processors, where the controller devices have been
* configured as part of board setup.
*
+ * This is incompatible with deferred probing so probe() must not
+ * return -EPROBE_DEFER.
+ *
* Returns zero if the driver registered and bound to a device, else returns
* a negative error code and with the driver not registered.
*/
@@ -682,7 +684,7 @@ static int platform_uevent(struct device *dev, struct kobj_uevent_env *env)
int rc;
/* Some devices have extra OF data and an OF-style MODALIAS */
- rc = of_device_uevent_modalias(dev,env);
+ rc = of_device_uevent_modalias(dev, env);
if (rc != -ENODEV)
return rc;
@@ -1126,8 +1128,8 @@ static int __init early_platform_driver_probe_id(char *class_str,
switch (match_id) {
case EARLY_PLATFORM_ID_ERROR:
- pr_warning("%s: unable to parse %s parameter\n",
- class_str, epdrv->pdrv->driver.name);
+ pr_warn("%s: unable to parse %s parameter\n",
+ class_str, epdrv->pdrv->driver.name);
/* fall-through */
case EARLY_PLATFORM_ID_UNSET:
match = NULL;
@@ -1158,8 +1160,8 @@ static int __init early_platform_driver_probe_id(char *class_str,
}
if (epdrv->pdrv->probe(match))
- pr_warning("%s: unable to probe %s early.\n",
- class_str, match->name);
+ pr_warn("%s: unable to probe %s early.\n",
+ class_str, match->name);
else
n++;
}
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index e145126..c6f54ab 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -165,21 +165,8 @@ struct sysfs_dirent *sysfs_get_active(struct sysfs_dirent *sd)
if (unlikely(!sd))
return NULL;
- while (1) {
- int v, t;
-
- v = atomic_read(&sd->s_active);
- if (unlikely(v < 0))
- return NULL;
-
- t = atomic_cmpxchg(&sd->s_active, v, v + 1);
- if (likely(t == v))
- break;
- if (t < 0)
- return NULL;
-
- cpu_relax();
- }
+ if (!atomic_inc_unless_negative(&sd->s_active))
+ return NULL;
if (likely(!ignore_lockdep(sd)))
rwsem_acquire_read(&sd->dep_map, 0, 1, _RET_IP_);
diff --git a/include/linux/device.h b/include/linux/device.h
index 9d6464e..4a7c4a8 100644
--- a/include/linux/device.h
+++ b/include/linux/device.h
@@ -111,17 +111,11 @@ struct bus_type {
struct iommu_ops *iommu_ops;
struct subsys_private *p;
+ struct lock_class_key lock_key;
};
-/* This is a #define to keep the compiler from merging different
- * instances of the __key variable */
-#define bus_register(subsys) \
-({ \
- static struct lock_class_key __key; \
- __bus_register(subsys, &__key); \
-})
-extern int __must_check __bus_register(struct bus_type *bus,
- struct lock_class_key *key);
+extern int __must_check bus_register(struct bus_type *bus);
+
extern void bus_unregister(struct bus_type *bus);
extern int __must_check bus_rescan_devices(struct bus_type *bus);
diff --git a/include/linux/platform_device.h b/include/linux/platform_device.h
index c082c71..9abf1db 100644
--- a/include/linux/platform_device.h
+++ b/include/linux/platform_device.h
@@ -20,12 +20,12 @@
struct mfd_cell;
struct platform_device {
- const char * name;
+ const char *name;
int id;
bool id_auto;
struct device dev;
u32 num_resources;
- struct resource * resource;
+ struct resource *resource;
const struct platform_device_id *id_entry;
@@ -47,9 +47,12 @@ extern struct bus_type platform_bus_type;
extern struct device platform_bus;
extern void arch_setup_pdev_archdata(struct platform_device *);
-extern struct resource *platform_get_resource(struct platform_device *, unsigned int, unsigned int);
+extern struct resource *platform_get_resource(struct platform_device *,
+ unsigned int, unsigned int);
extern int platform_get_irq(struct platform_device *, unsigned int);
-extern struct resource *platform_get_resource_byname(struct platform_device *, unsigned int, const char *);
+extern struct resource *platform_get_resource_byname(struct platform_device *,
+ unsigned int,
+ const char *);
extern int platform_get_irq_byname(struct platform_device *, const char *);
extern int platform_add_devices(struct platform_device **, int);
@@ -161,7 +164,8 @@ extern struct platform_device *platform_device_alloc(const char *name, int id);
extern int platform_device_add_resources(struct platform_device *pdev,
const struct resource *res,
unsigned int num);
-extern int platform_device_add_data(struct platform_device *pdev, const void *data, size_t size);
+extern int platform_device_add_data(struct platform_device *pdev,
+ const void *data, size_t size);
extern int platform_device_add(struct platform_device *pdev);
extern void platform_device_del(struct platform_device *pdev);
extern void platform_device_put(struct platform_device *pdev);
@@ -190,7 +194,8 @@ static inline void *platform_get_drvdata(const struct platform_device *pdev)
return dev_get_drvdata(&pdev->dev);
}
-static inline void platform_set_drvdata(struct platform_device *pdev, void *data)
+static inline void platform_set_drvdata(struct platform_device *pdev,
+ void *data)
{
dev_set_drvdata(&pdev->dev, data);
}
@@ -222,10 +227,10 @@ static void __exit __platform_driver##_exit(void) \
} \
module_exit(__platform_driver##_exit);
-extern struct platform_device *platform_create_bundle(struct platform_driver *driver,
- int (*probe)(struct platform_device *),
- struct resource *res, unsigned int n_res,
- const void *data, size_t size);
+extern struct platform_device *platform_create_bundle(
+ struct platform_driver *driver, int (*probe)(struct platform_device *),
+ struct resource *res, unsigned int n_res,
+ const void *data, size_t size);
/* early platform driver interface */
struct early_platform_driver {
diff --git a/kernel/rtmutex-tester.c b/kernel/rtmutex-tester.c
index 7890b10..55ad765 100644
--- a/kernel/rtmutex-tester.c
+++ b/kernel/rtmutex-tester.c
@@ -366,8 +366,8 @@ static ssize_t sysfs_test_status(struct device *dev, struct device_attribute *at
return curr - buf;
}
-static DEVICE_ATTR(status, 0600, sysfs_test_status, NULL);
-static DEVICE_ATTR(command, 0600, NULL, sysfs_test_command);
+static DEVICE_ATTR(status, 0400, sysfs_test_status, NULL);
+static DEVICE_ATTR(command, 0200, NULL, sysfs_test_command);
static struct bus_type rttest_subsys = {
.name = "rttest",
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