Merge branch 'staging-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging-2.6

* 'staging-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging-2.6:
  zcache: Fix build error when sysfs is not defined
  zcache: Use div_u64 for 64-bit division
  staging:rts_pstor: fix thread synchronization flow
  drivers:staging:solo6x10:add the missed slab.h
  staging: zcache: include module.h for MODULE_LICENSE
  drivers/staging/hv/blkvsc_drv.c: eliminate NULL pointer dereference
  Staging: Add clk API note to nvec/TODO
  drivers/staging/ath6kl/miscdrv/ar3kps/ar3kpsparser.c: adjust array index
  staging: more missing slab.h inclusions
  drivers/staging/solo6x10/p2m.c needs slab.h
  drivers/staging/solo6x10/core.c needs slab.h
  drivers/staging/dt3155v4l/dt3155v4l.c needs slab.h
  drivers/staging/speakup/devsynth.c: fix "buffer size is not provably correct" error
  Staging: iio: add some unlocks to raw_read() functions
  staging: ft1000_proc needs asm/io.h for inw/outw on sparc
  staging: rtl8192u: declare MODULE_FIRMWARE
  gma500: Fix clashes with DRM updates
  staging: zcache: module is GPL
  staging: fix zcache building

21 files changed, 111 insertions, 95 deletions

diff --git a/drivers/staging/ath6kl/miscdrv/ar3kps/ar3kpsparser.c b/drivers/staging/ath6kl/miscdrv/ar3kps/ar3kpsparser.c
index c01c0cb0af4..b99a11a9dd6 100644
--- a/drivers/staging/ath6kl/miscdrv/ar3kps/ar3kpsparser.c
+++ b/drivers/staging/ath6kl/miscdrv/ar3kps/ar3kpsparser.c
@@ -812,7 +812,7 @@ int AthCreateCommandList(struct ps_cmd_packet **HciPacketList, u32 *numPackets)
     for(count = 0; count < Patch_Count; count++) {
 
         AR_DEBUG_PRINTF(ATH_DEBUG_ERR,("Freeing Patch Buffer %d \r\n",count));
-        kfree(RamPatch[Patch_Count].Data);
+        kfree(RamPatch[count].Data);
     }
 
     for(count = 0; count < Tag_Count; count++) {
diff --git a/drivers/staging/dt3155v4l/dt3155v4l.c b/drivers/staging/dt3155v4l/dt3155v4l.c
index fe02d22274b..05aa41cf875 100644
--- a/drivers/staging/dt3155v4l/dt3155v4l.c
+++ b/drivers/staging/dt3155v4l/dt3155v4l.c
@@ -22,6 +22,7 @@
 #include <linux/stringify.h>
 #include <linux/delay.h>
 #include <linux/kthread.h>
+#include <linux/slab.h>
 #include <media/v4l2-dev.h>
 #include <media/v4l2-ioctl.h>
 #include <media/videobuf2-dma-contig.h>
diff --git a/drivers/staging/ft1000/ft1000-pcmcia/ft1000_proc.c b/drivers/staging/ft1000/ft1000-pcmcia/ft1000_proc.c
index 627a98b4ec3..9e728b3415e 100644
--- a/drivers/staging/ft1000/ft1000-pcmcia/ft1000_proc.c
+++ b/drivers/staging/ft1000/ft1000-pcmcia/ft1000_proc.c
@@ -22,6 +22,7 @@
 #include <linux/string.h>
 #include <linux/vmalloc.h>
 #include <linux/netdevice.h>
+#include <asm/io.h>
 #include <asm/uaccess.h>
 #include "ft1000.h"
 
diff --git a/drivers/staging/hv/blkvsc_drv.c b/drivers/staging/hv/blkvsc_drv.c
index 3612574ca52..d286b222318 100644
--- a/drivers/staging/hv/blkvsc_drv.c
+++ b/drivers/staging/hv/blkvsc_drv.c
@@ -325,7 +325,7 @@ static int blkvsc_do_operation(struct block_device_context *blkdev,
 
         page_buf = alloc_page(GFP_KERNEL);
         if (!page_buf) {
-                kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
+                kmem_cache_free(blkdev->request_pool, blkvsc_req);
                 return -ENOMEM;
         }
 
@@ -422,7 +422,7 @@ cleanup:
 
         __free_page(page_buf);
 
-        kmem_cache_free(blkvsc_req->dev->request_pool, blkvsc_req);
+        kmem_cache_free(blkdev->request_pool, blkvsc_req);
 
         return ret;
 }
diff --git a/drivers/staging/iio/accel/adis16203_core.c b/drivers/staging/iio/accel/adis16203_core.c
index bf1988884e9..cf5d15da76a 100644
--- a/drivers/staging/iio/accel/adis16203_core.c
+++ b/drivers/staging/iio/accel/adis16203_core.c
@@ -311,13 +311,17 @@ static int adis16203_read_raw(struct iio_dev *indio_dev,
                 mutex_lock(&indio_dev->mlock);
                 addr = adis16203_addresses[chan->address][0];
                 ret = adis16203_spi_read_reg_16(indio_dev, addr, &val16);
-                if (ret)
+                if (ret) {
+                        mutex_unlock(&indio_dev->mlock);
                         return ret;
+                }
 
                 if (val16 & ADIS16203_ERROR_ACTIVE) {
                         ret = adis16203_check_status(indio_dev);
-                        if (ret)
+                        if (ret) {
+                                mutex_unlock(&indio_dev->mlock);
                                 return ret;
+                        }
                 }
                 val16 = val16 & ((1 << chan->scan_type.realbits) - 1);
                 if (chan->scan_type.sign == 's')
diff --git a/drivers/staging/iio/accel/adis16204_core.c b/drivers/staging/iio/accel/adis16204_core.c
index cfd09b3b993..3e2b62654b7 100644
--- a/drivers/staging/iio/accel/adis16204_core.c
+++ b/drivers/staging/iio/accel/adis16204_core.c
@@ -341,13 +341,17 @@ static int adis16204_read_raw(struct iio_dev *indio_dev,
                 mutex_lock(&indio_dev->mlock);
                 addr = adis16204_addresses[chan->address][0];
                 ret = adis16204_spi_read_reg_16(indio_dev, addr, &val16);
-                if (ret)
+                if (ret) {
+                        mutex_unlock(&indio_dev->mlock);
                         return ret;
+                }
 
                 if (val16 & ADIS16204_ERROR_ACTIVE) {
                         ret = adis16204_check_status(indio_dev);
-                        if (ret)
+                        if (ret) {
+                                mutex_unlock(&indio_dev->mlock);
                                 return ret;
+                        }
                 }
                 val16 = val16 & ((1 << chan->scan_type.realbits) - 1);
                 if (chan->scan_type.sign == 's')
diff --git a/drivers/staging/iio/accel/adis16209_core.c b/drivers/staging/iio/accel/adis16209_core.c
index 55f3a7bcaf0..bec1fa8de9b 100644
--- a/drivers/staging/iio/accel/adis16209_core.c
+++ b/drivers/staging/iio/accel/adis16209_core.c
@@ -337,13 +337,17 @@ static int adis16209_read_raw(struct iio_dev *indio_dev,
                 mutex_lock(&indio_dev->mlock);
                 addr = adis16209_addresses[chan->address][0];
                 ret = adis16209_spi_read_reg_16(indio_dev, addr, &val16);
-                if (ret)
+                if (ret) {
+                        mutex_unlock(&indio_dev->mlock);
                         return ret;
+                }
 
                 if (val16 & ADIS16209_ERROR_ACTIVE) {
                         ret = adis16209_check_status(indio_dev);
-                        if (ret)
+                        if (ret) {
+                                mutex_unlock(&indio_dev->mlock);
                                 return ret;
+                        }
                 }
                 val16 = val16 & ((1 << chan->scan_type.realbits) - 1);
                 if (chan->scan_type.sign == 's')
diff --git a/drivers/staging/iio/accel/adis16240_core.c b/drivers/staging/iio/accel/adis16240_core.c
index 4a4eafc5863..aee8b69173c 100644
--- a/drivers/staging/iio/accel/adis16240_core.c
+++ b/drivers/staging/iio/accel/adis16240_core.c
@@ -370,13 +370,17 @@ static int adis16240_read_raw(struct iio_dev *indio_dev,
                 mutex_lock(&indio_dev->mlock);
                 addr = adis16240_addresses[chan->address][0];
                 ret = adis16240_spi_read_reg_16(indio_dev, addr, &val16);
-                if (ret)
+                if (ret) {
+                        mutex_unlock(&indio_dev->mlock);
                         return ret;
+                }
 
                 if (val16 & ADIS16240_ERROR_ACTIVE) {
                         ret = adis16240_check_status(indio_dev);
-                        if (ret)
+                        if (ret) {
+                                mutex_unlock(&indio_dev->mlock);
                                 return ret;
+                        }
                 }
                 val16 = val16 & ((1 << chan->scan_type.realbits) - 1);
                 if (chan->scan_type.sign == 's')
diff --git a/drivers/staging/iio/gyro/adis16260_core.c b/drivers/staging/iio/gyro/adis16260_core.c
index 05797f404be..f2d43cfcc49 100644
--- a/drivers/staging/iio/gyro/adis16260_core.c
+++ b/drivers/staging/iio/gyro/adis16260_core.c
@@ -446,13 +446,17 @@ static int adis16260_read_raw(struct iio_dev *indio_dev,
                 mutex_lock(&indio_dev->mlock);
                 addr = adis16260_addresses[chan->address][0];
                 ret = adis16260_spi_read_reg_16(indio_dev, addr, &val16);
-                if (ret)
+                if (ret) {
+                        mutex_unlock(&indio_dev->mlock);
                         return ret;
+                }
 
                 if (val16 & ADIS16260_ERROR_ACTIVE) {
                         ret = adis16260_check_status(indio_dev);
-                        if (ret)
+                        if (ret) {
+                                mutex_unlock(&indio_dev->mlock);
                                 return ret;
+                        }
                 }
                 val16 = val16 & ((1 << chan->scan_type.realbits) - 1);
                 if (chan->scan_type.sign == 's')
diff --git a/drivers/staging/nvec/TODO b/drivers/staging/nvec/TODO
index 77b47f763f2..649d6b70dea 100644
--- a/drivers/staging/nvec/TODO
+++ b/drivers/staging/nvec/TODO
@@ -4,5 +4,7 @@ ToDo list (incomplete, unordered)
         - add compile as module support
         - move nvec devices to mfd cells?
         - adjust to kernel style
-
-
+        - fix clk usage
+          should not be using clk_get_sys(), but clk_get(&pdev->dev, conn)
+          where conn is either NULL if the device only has one clock, or
+          the device specific name if it has multiple clocks.
diff --git a/drivers/staging/rtl8192u/r819xU_firmware.c b/drivers/staging/rtl8192u/r819xU_firmware.c
index 6766f468639..4bb5fffca5b 100644
--- a/drivers/staging/rtl8192u/r819xU_firmware.c
+++ b/drivers/staging/rtl8192u/r819xU_firmware.c
@@ -399,10 +399,7 @@ download_firmware_fail:
 
 }
 
-
-
-
-
-
-
+MODULE_FIRMWARE("RTL8192U/boot.img");
+MODULE_FIRMWARE("RTL8192U/main.img");
+MODULE_FIRMWARE("RTL8192U/data.img");
 
diff --git a/drivers/staging/rts_pstor/rtsx.c b/drivers/staging/rts_pstor/rtsx.c
index 5ff59f27d10..16c73fbff51 100644
--- a/drivers/staging/rts_pstor/rtsx.c
+++ b/drivers/staging/rts_pstor/rtsx.c
@@ -66,12 +66,6 @@ static int msi_en;
 module_param(msi_en, int, S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(msi_en, "enable msi");
 
-/* These are used to make sure the module doesn't unload before all the
- * threads have exited.
- */
-static atomic_t total_threads = ATOMIC_INIT(0);
-static DECLARE_COMPLETION(threads_gone);
-
 static irqreturn_t rtsx_interrupt(int irq, void *dev_id);
 
 /***********************************************************************
@@ -192,7 +186,7 @@ static int queuecommand_lck(struct scsi_cmnd *srb,
         /* enqueue the command and wake up the control thread */
         srb->scsi_done = done;
         chip->srb = srb;
-        up(&(dev->sema));
+        complete(&dev->cmnd_ready);
 
         return 0;
 }
@@ -475,7 +469,7 @@ static int rtsx_control_thread(void *__dev)
         current->flags |= PF_NOFREEZE;
 
         for (;;) {
-                if (down_interruptible(&dev->sema))
+                if (wait_for_completion_interruptible(&dev->cmnd_ready))
                         break;
 
                 /* lock the device pointers */
@@ -557,8 +551,6 @@ SkipForAbort:
                 mutex_unlock(&dev->dev_mutex);
         } /* for (;;) */
 
-        scsi_host_put(host);
-
         /* notify the exit routine that we're actually exiting now
          *
          * complete()/wait_for_completion() is similar to up()/down(),
@@ -573,7 +565,7 @@ SkipForAbort:
          * This is important in preemption kernels, which transfer the flow
          * of execution immediately upon a complete().
          */
-        complete_and_exit(&threads_gone, 0);
+        complete_and_exit(&dev->control_exit, 0);
 }
 
 
@@ -581,7 +573,6 @@ static int rtsx_polling_thread(void *__dev)
 {
         struct rtsx_dev *dev = (struct rtsx_dev *)__dev;
         struct rtsx_chip *chip = dev->chip;
-        struct Scsi_Host *host = rtsx_to_host(dev);
         struct sd_info *sd_card = &(chip->sd_card);
         struct xd_info *xd_card = &(chip->xd_card);
         struct ms_info *ms_card = &(chip->ms_card);
@@ -621,8 +612,7 @@ static int rtsx_polling_thread(void *__dev)
                 mutex_unlock(&dev->dev_mutex);
         }
 
-        scsi_host_put(host);
-        complete_and_exit(&threads_gone, 0);
+        complete_and_exit(&dev->polling_exit, 0);
 }
 
 /*
@@ -699,29 +689,38 @@ static void rtsx_release_resources(struct rtsx_dev *dev)
 {
         printk(KERN_INFO "-- %s\n", __func__);
 
+        /* Tell the control thread to exit.  The SCSI host must
+         * already have been removed so it won't try to queue
+         * any more commands.
+         */
+        printk(KERN_INFO "-- sending exit command to thread\n");
+        complete(&dev->cmnd_ready);
+        if (dev->ctl_thread)
+                wait_for_completion(&dev->control_exit);
+        if (dev->polling_thread)
+                wait_for_completion(&dev->polling_exit);
+
+        wait_timeout(200);
+
         if (dev->rtsx_resv_buf) {
-                dma_free_coherent(&(dev->pci->dev), HOST_CMDS_BUF_LEN,
+                dma_free_coherent(&(dev->pci->dev), RTSX_RESV_BUF_LEN,
                                 dev->rtsx_resv_buf, dev->rtsx_resv_buf_addr);
                 dev->chip->host_cmds_ptr = NULL;
                 dev->chip->host_sg_tbl_ptr = NULL;
         }
 
-        pci_disable_device(dev->pci);
-        pci_release_regions(dev->pci);
-
-        if (dev->irq > 0) {
+        if (dev->irq > 0)
                 free_irq(dev->irq, (void *)dev);
-        }
-        if (dev->chip->msi_en) {
+        if (dev->chip->msi_en)
                 pci_disable_msi(dev->pci);
-        }
+        if (dev->remap_addr)
+                iounmap(dev->remap_addr);
 
-        /* Tell the control thread to exit.  The SCSI host must
-         * already have been removed so it won't try to queue
-         * any more commands.
-         */
-        printk(KERN_INFO "-- sending exit command to thread\n");
-        up(&dev->sema);
+        pci_disable_device(dev->pci);
+        pci_release_regions(dev->pci);
+
+        rtsx_release_chip(dev->chip);
+        kfree(dev->chip);
 }
 
 /* First stage of disconnect processing: stop all commands and remove
@@ -739,6 +738,7 @@ static void quiesce_and_remove_host(struct rtsx_dev *dev)
         scsi_unlock(host);
         mutex_unlock(&dev->dev_mutex);
         wake_up(&dev->delay_wait);
+        wait_for_completion(&dev->scanning_done);
 
         /* Wait some time to let other threads exist */
         wait_timeout(100);
@@ -793,8 +793,7 @@ static int rtsx_scan_thread(void *__dev)
                 /* Should we unbind if no devices were detected? */
         }
 
-        scsi_host_put(rtsx_to_host(dev));
-        complete_and_exit(&threads_gone, 0);
+        complete_and_exit(&dev->scanning_done, 0);
 }
 
 static void rtsx_init_options(struct rtsx_chip *chip)
@@ -941,8 +940,11 @@ static int __devinit rtsx_probe(struct pci_dev *pci, const struct pci_device_id
 
         spin_lock_init(&dev->reg_lock);
         mutex_init(&(dev->dev_mutex));
-        sema_init(&(dev->sema), 0);
+        init_completion(&dev->cmnd_ready);
+        init_completion(&dev->control_exit);
+        init_completion(&dev->polling_exit);
         init_completion(&(dev->notify));
+        init_completion(&dev->scanning_done);
         init_waitqueue_head(&dev->delay_wait);
 
         dev->pci = pci;
@@ -992,28 +994,22 @@ static int __devinit rtsx_probe(struct pci_dev *pci, const struct pci_device_id
         pci_set_master(pci);
         synchronize_irq(dev->irq);
 
-        err = scsi_add_host(host, &pci->dev);
-        if (err) {
-                printk(KERN_ERR "Unable to add the scsi host\n");
-                goto errout;
-        }
-
         rtsx_init_chip(dev->chip);
 
         /* Start up our control thread */
-        th = kthread_create(rtsx_control_thread, dev, CR_DRIVER_NAME);
+        th = kthread_run(rtsx_control_thread, dev, CR_DRIVER_NAME);
         if (IS_ERR(th)) {
                 printk(KERN_ERR "Unable to start control thread\n");
                 err = PTR_ERR(th);
                 goto errout;
         }
+        dev->ctl_thread = th;
 
-        /* Take a reference to the host for the control thread and
-         * count it among all the threads we have launched.  Then
-         * start it up. */
-        scsi_host_get(rtsx_to_host(dev));
-        atomic_inc(&total_threads);
-        wake_up_process(th);
+        err = scsi_add_host(host, &pci->dev);
+        if (err) {
+                printk(KERN_ERR "Unable to add the scsi host\n");
+                goto errout;
+        }
 
         /* Start up the thread for delayed SCSI-device scanning */
         th = kthread_create(rtsx_scan_thread, dev, "rtsx-scan");
@@ -1024,28 +1020,17 @@ static int __devinit rtsx_probe(struct pci_dev *pci, const struct pci_device_id
                 goto errout;
         }
 
-        /* Take a reference to the host for the scanning thread and
-         * count it among all the threads we have launched.  Then
-         * start it up. */
-        scsi_host_get(rtsx_to_host(dev));
-        atomic_inc(&total_threads);
         wake_up_process(th);
 
         /* Start up the thread for polling thread */
-        th = kthread_create(rtsx_polling_thread, dev, "rtsx-polling");
+        th = kthread_run(rtsx_polling_thread, dev, "rtsx-polling");
         if (IS_ERR(th)) {
                 printk(KERN_ERR "Unable to start the device-polling thread\n");
                 quiesce_and_remove_host(dev);
                 err = PTR_ERR(th);
                 goto errout;
         }
-
-        /* Take a reference to the host for the polling thread and
-         * count it among all the threads we have launched.  Then
-         * start it up. */
-        scsi_host_get(rtsx_to_host(dev));
-        atomic_inc(&total_threads);
-        wake_up_process(th);
+        dev->polling_thread = th;
 
         pci_set_drvdata(pci, dev);
 
@@ -1108,16 +1093,6 @@ static void __exit rtsx_exit(void)
 
         pci_unregister_driver(&driver);
 
-        /* Don't return until all of our control and scanning threads
-         * have exited.  Since each thread signals threads_gone as its
-         * last act, we have to call wait_for_completion the right number
-         * of times.
-         */
-        while (atomic_read(&total_threads) > 0) {
-                wait_for_completion(&threads_gone);
-                atomic_dec(&total_threads);
-        }
-
         printk(KERN_INFO "%s module exit\n", CR_DRIVER_NAME);
 }
 
diff --git a/drivers/staging/rts_pstor/rtsx.h b/drivers/staging/rts_pstor/rtsx.h
index 247615ba1d2..86e47c2e3e3 100644
--- a/drivers/staging/rts_pstor/rtsx.h
+++ b/drivers/staging/rts_pstor/rtsx.h
@@ -112,9 +112,16 @@ struct rtsx_dev {
         /* locks */
         spinlock_t              reg_lock;
 
+        struct task_struct      *ctl_thread;     /* the control thread   */
+        struct task_struct      *polling_thread; /* the polling thread   */
+
         /* mutual exclusion and synchronization structures */
-        struct semaphore        sema;            /* to sleep thread on      */
+        struct completion       cmnd_ready;      /* to sleep thread on      */
+        struct completion       control_exit;    /* control thread exit     */
+        struct completion       polling_exit;    /* polling thread exit     */
         struct completion       notify;          /* thread begin/end        */
+        struct completion       scanning_done;   /* wait for scan thread    */
+
         wait_queue_head_t       delay_wait;      /* wait during scan, reset */
         struct mutex            dev_mutex;
 
diff --git a/drivers/staging/solo6x10/core.c b/drivers/staging/solo6x10/core.c
index 76779949f14..f974f6412ad 100644
--- a/drivers/staging/solo6x10/core.c
+++ b/drivers/staging/solo6x10/core.c
@@ -21,6 +21,7 @@
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/interrupt.h>
+#include <linux/slab.h>
 #include <linux/videodev2.h>
 #include "solo6x10.h"
 #include "tw28.h"
diff --git a/drivers/staging/solo6x10/enc.c b/drivers/staging/solo6x10/enc.c
index 285f7f35006..de502599bb1 100644
--- a/drivers/staging/solo6x10/enc.c
+++ b/drivers/staging/solo6x10/enc.c
@@ -18,6 +18,7 @@
  */
 
 #include <linux/kernel.h>
+#include <linux/slab.h>
 #include "solo6x10.h"
 #include "osd-font.h"
 
diff --git a/drivers/staging/solo6x10/g723.c b/drivers/staging/solo6x10/g723.c
index bd8eb92c94b..59274bfca95 100644
--- a/drivers/staging/solo6x10/g723.c
+++ b/drivers/staging/solo6x10/g723.c
@@ -21,6 +21,7 @@
 #include <linux/mempool.h>
 #include <linux/poll.h>
 #include <linux/kthread.h>
+#include <linux/slab.h>
 #include <linux/freezer.h>
 #include <sound/core.h>
 #include <sound/initval.h>
diff --git a/drivers/staging/solo6x10/p2m.c b/drivers/staging/solo6x10/p2m.c
index 5717eabb04a..56210f0fc5e 100644
--- a/drivers/staging/solo6x10/p2m.c
+++ b/drivers/staging/solo6x10/p2m.c
@@ -18,6 +18,7 @@
  */
 
 #include <linux/kernel.h>
+#include <linux/slab.h>
 #include <linux/scatterlist.h>
 #include "solo6x10.h"
 
diff --git a/drivers/staging/solo6x10/solo6x10.h b/drivers/staging/solo6x10/solo6x10.h
index 17c06bd6cc9..abee7213202 100644
--- a/drivers/staging/solo6x10/solo6x10.h
+++ b/drivers/staging/solo6x10/solo6x10.h
@@ -28,6 +28,7 @@
 #include <linux/list.h>
 #include <linux/wait.h>
 #include <linux/delay.h>
+#include <linux/slab.h>
 #include <asm/io.h>
 #include <linux/atomic.h>
 #include <linux/videodev2.h>
diff --git a/drivers/staging/speakup/devsynth.c b/drivers/staging/speakup/devsynth.c
index 39dc586fc8b..940769ef883 100644
--- a/drivers/staging/speakup/devsynth.c
+++ b/drivers/staging/speakup/devsynth.c
@@ -18,13 +18,14 @@ static ssize_t speakup_file_write(struct file *fp, const char *buffer,
 {
         size_t count = nbytes;
         const char *ptr = buffer;
-        int bytes;
+        size_t bytes;
         unsigned long flags;
         u_char buf[256];
+
         if (synth == NULL)
                 return -ENODEV;
         while (count > 0) {
-                bytes = min_t(size_t, count, sizeof(buf));
+                bytes = min(count, sizeof(buf));
                 if (copy_from_user(buf, ptr, bytes))
                         return -EFAULT;
                 count -= bytes;
diff --git a/drivers/staging/zcache/Makefile b/drivers/staging/zcache/Makefile
index f5ec64f9447..60daa272c20 100644
--- a/drivers/staging/zcache/Makefile
+++ b/drivers/staging/zcache/Makefile
@@ -1,3 +1,3 @@
-zcache-y        :=      tmem.o
+zcache-y        :=      zcache-main.o tmem.o
 
 obj-$(CONFIG_ZCACHE)    +=      zcache.o
diff --git a/drivers/staging/zcache/zcache.c b/drivers/staging/zcache/zcache-main.c
index 65a81a0d7c4..855a5bb56a4 100644
--- a/drivers/staging/zcache/zcache.c
+++ b/drivers/staging/zcache/zcache-main.c
@@ -19,6 +19,7 @@
  *   http://marc.info/?l=linux-mm&m=127811271605009
  */
 
+#include <linux/module.h>
 #include <linux/cpu.h>
 #include <linux/highmem.h>
 #include <linux/list.h>
@@ -27,6 +28,7 @@
 #include <linux/spinlock.h>
 #include <linux/types.h>
 #include <linux/atomic.h>
+#include <linux/math64.h>
 #include "tmem.h"
 
 #include "../zram/xvmalloc.h" /* if built in drivers/staging */
@@ -53,6 +55,9 @@
 
 #define MAX_CLIENTS 16
 #define LOCAL_CLIENT ((uint16_t)-1)
+
+MODULE_LICENSE("GPL");
+
 struct zcache_client {
         struct tmem_pool *tmem_pools[MAX_POOLS_PER_CLIENT];
         struct xv_pool *xvpool;
@@ -1158,6 +1163,7 @@ static void *zcache_pampd_create(char *data, size_t size, bool raw, int eph,
         uint16_t client_id = get_client_id_from_client(cli);
         unsigned long zv_mean_zsize;
         unsigned long curr_pers_pampd_count;
+        u64 total_zsize;
 
         if (eph) {
                 ret = zcache_compress(page, &cdata, &clen);
@@ -1190,8 +1196,9 @@ static void *zcache_pampd_create(char *data, size_t size, bool raw, int eph,
                 }
                 /* reject if mean compression is too poor */
                 if ((clen > zv_max_mean_zsize) && (curr_pers_pampd_count > 0)) {
-                        zv_mean_zsize = xv_get_total_size_bytes(cli->xvpool) /
-                                                curr_pers_pampd_count;
+                        total_zsize = xv_get_total_size_bytes(cli->xvpool);
+                        zv_mean_zsize = div_u64(total_zsize,
+                                                curr_pers_pampd_count);
                         if (zv_mean_zsize > zv_max_mean_zsize) {
                                 zcache_mean_compress_poor++;
                                 goto out;
@@ -1929,9 +1936,9 @@ __setup("nofrontswap", no_frontswap);
 
 static int __init zcache_init(void)
 {
-#ifdef CONFIG_SYSFS
         int ret = 0;
 
+#ifdef CONFIG_SYSFS
         ret = sysfs_create_group(mm_kobj, &zcache_attr_group);
         if (ret) {
                 pr_err("zcache: can't create sysfs\n");