Merge branch 'linus' into x86/mm

Conflicts:
	arch/x86/mm/fault.c

2 files changed, 29 insertions, 0 deletions

diff --git a/fs/sysfs/Kconfig b/fs/sysfs/Kconfig
new file mode 100644
index 000000000000..f4b67588b9d6
--- /dev/null
+++ b/fs/sysfs/Kconfig
@@ -0,0 +1,23 @@
+config SYSFS
+        bool "sysfs file system support" if EMBEDDED
+        default y
+        help
+        The sysfs filesystem is a virtual filesystem that the kernel uses to
+        export internal kernel objects, their attributes, and their
+        relationships to one another.
+
+        Users can use sysfs to ascertain useful information about the running
+        kernel, such as the devices the kernel has discovered on each bus and
+        which driver each is bound to. sysfs can also be used to tune devices
+        and other kernel subsystems.
+
+        Some system agents rely on the information in sysfs to operate.
+        /sbin/hotplug uses device and object attributes in sysfs to assist in
+        delegating policy decisions, like persistently naming devices.
+
+        sysfs is currently used by the block subsystem to mount the root
+        partition.  If sysfs is disabled you must specify the boot device on
+        the kernel boot command line via its major and minor numbers.  For
+        example, "root=03:01" for /dev/hda1.
+
+        Designers of embedded systems may wish to say N here to conserve space.
diff --git a/fs/sysfs/bin.c b/fs/sysfs/bin.c
index 66f6e58a7e4b..f2c478c3424e 100644
--- a/fs/sysfs/bin.c
+++ b/fs/sysfs/bin.c
@@ -63,6 +63,9 @@ read(struct file *file, char __user *userbuf, size_t bytes, loff_t *off)
         int count = min_t(size_t, bytes, PAGE_SIZE);
         char *temp;
 
+        if (!bytes)
+                return 0;
+
         if (size) {
                 if (offs > size)
                         return 0;
@@ -131,6 +134,9 @@ static ssize_t write(struct file *file, const char __user *userbuf,
         int count = min_t(size_t, bytes, PAGE_SIZE);
         char *temp;
 
+        if (!bytes)
+                return 0;
+
         if (size) {
                 if (offs > size)
                         return 0;