ashmem: Move to drivers/staging/android; fix odd merges.

Change-Id: Ie8d4dea92c9bc9c5efe69886db05f93b3487f3a4
Signed-off-by: Kyle Repinski <repinski23@gmail.com>

2 files changed, 0 insertions, 755 deletions

diff --git a/mm/Makefile b/mm/Makefile
index 7ec5e3b19b1..9edc91924ff 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -30,7 +30,6 @@ obj-$(CONFIG_HUGETLBFS)	+= hugetlb.o
 obj-$(CONFIG_NUMA) 	+= mempolicy.o
 obj-$(CONFIG_SPARSEMEM)	+= sparse.o
 obj-$(CONFIG_SPARSEMEM_VMEMMAP) += sparse-vmemmap.o
-obj-$(CONFIG_ASHMEM) += ashmem.o
 obj-$(CONFIG_SLOB) += slob.o
 obj-$(CONFIG_MMU_NOTIFIER) += mmu_notifier.o
 obj-$(CONFIG_KSM) += ksm.o
diff --git a/mm/ashmem.c b/mm/ashmem.c
deleted file mode 100644
index 62fab280cc7..00000000000
--- a/mm/ashmem.c
+++ /dev/null
@@ -1,754 +0,0 @@
-/* mm/ashmem.c
-**
-** Anonymous Shared Memory Subsystem, ashmem
-**
-** Copyright (C) 2008 Google, Inc.
-**
-** Robert Love <rlove@google.com>
-**
-** This software is licensed under the terms of the GNU General Public
-** License version 2, as published by the Free Software Foundation, and
-** may be copied, distributed, and modified under those terms.
-**
-** 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.
-*/
-
-#include <linux/module.h>
-#include <linux/file.h>
-#include <linux/fs.h>
-#include <linux/miscdevice.h>
-#include <linux/security.h>
-#include <linux/mm.h>
-#include <linux/mman.h>
-#include <linux/uaccess.h>
-#include <linux/personality.h>
-#include <linux/bitops.h>
-#include <linux/mutex.h>
-#include <linux/shmem_fs.h>
-#include <linux/ashmem.h>
-
-#define ASHMEM_NAME_PREFIX "dev/ashmem/"
-#define ASHMEM_NAME_PREFIX_LEN (sizeof(ASHMEM_NAME_PREFIX) - 1)
-#define ASHMEM_FULL_NAME_LEN (ASHMEM_NAME_LEN + ASHMEM_NAME_PREFIX_LEN)
-
-/*
- * ashmem_area - anonymous shared memory area
- * Lifecycle: From our parent file's open() until its release()
- * Locking: Protected by `ashmem_mutex'
- * Big Note: Mappings do NOT pin this structure; it dies on close()
- */
-struct ashmem_area {
-	char name[ASHMEM_FULL_NAME_LEN];/* optional name for /proc/pid/maps */
-	struct list_head unpinned_list;	/* list of all ashmem areas */
-	struct file *file;		/* the shmem-based backing file */
-	size_t size;			/* size of the mapping, in bytes */
-	unsigned long prot_mask;	/* allowed prot bits, as vm_flags */
-};
-
-/*
- * ashmem_range - represents an interval of unpinned (evictable) pages
- * Lifecycle: From unpin to pin
- * Locking: Protected by `ashmem_mutex'
- */
-struct ashmem_range {
-	struct list_head lru;		/* entry in LRU list */
-	struct list_head unpinned;	/* entry in its area's unpinned list */
-	struct ashmem_area *asma;	/* associated area */
-	size_t pgstart;			/* starting page, inclusive */
-	size_t pgend;			/* ending page, inclusive */
-	unsigned int purged;		/* ASHMEM_NOT or ASHMEM_WAS_PURGED */
-};
-
-/* LRU list of unpinned pages, protected by ashmem_mutex */
-static LIST_HEAD(ashmem_lru_list);
-
-/* Count of pages on our LRU list, protected by ashmem_mutex */
-static unsigned long lru_count;
-
-/*
- * ashmem_mutex - protects the list of and each individual ashmem_area
- *
- * Lock Ordering: ashmex_mutex -> i_mutex -> i_alloc_sem
- */
-static DEFINE_MUTEX(ashmem_mutex);
-
-static struct kmem_cache *ashmem_area_cachep __read_mostly;
-static struct kmem_cache *ashmem_range_cachep __read_mostly;
-
-#define range_size(range) \
-  ((range)->pgend - (range)->pgstart + 1)
-
-#define range_on_lru(range) \
-  ((range)->purged == ASHMEM_NOT_PURGED)
-
-#define page_range_subsumes_range(range, start, end) \
-  (((range)->pgstart >= (start)) && ((range)->pgend <= (end)))
-
-#define page_range_subsumed_by_range(range, start, end) \
-  (((range)->pgstart <= (start)) && ((range)->pgend >= (end)))
-
-#define page_in_range(range, page) \
- (((range)->pgstart <= (page)) && ((range)->pgend >= (page)))
-
-#define page_range_in_range(range, start, end) \
-  (page_in_range(range, start) || page_in_range(range, end) || \
-   page_range_subsumes_range(range, start, end))
-
-#define range_before_page(range, page) \
-  ((range)->pgend < (page))
-
-#define PROT_MASK		(PROT_EXEC | PROT_READ | PROT_WRITE)
-
-static inline void lru_add(struct ashmem_range *range)
-{
-	list_add_tail(&range->lru, &ashmem_lru_list);
-	lru_count += range_size(range);
-}
-
-static inline void lru_del(struct ashmem_range *range)
-{
-	list_del(&range->lru);
-	lru_count -= range_size(range);
-}
-
-/*
- * range_alloc - allocate and initialize a new ashmem_range structure
- *
- * 'asma' - associated ashmem_area
- * 'prev_range' - the previous ashmem_range in the sorted asma->unpinned list
- * 'purged' - initial purge value (ASMEM_NOT_PURGED or ASHMEM_WAS_PURGED)
- * 'start' - starting page, inclusive
- * 'end' - ending page, inclusive
- *
- * Caller must hold ashmem_mutex.
- */
-static int range_alloc(struct ashmem_area *asma,
-		       struct ashmem_range *prev_range, unsigned int purged,
-		       size_t start, size_t end)
-{
-	struct ashmem_range *range;
-
-	range = kmem_cache_zalloc(ashmem_range_cachep, GFP_KERNEL);
-	if (unlikely(!range))
-		return -ENOMEM;
-
-	range->asma = asma;
-	range->pgstart = start;
-	range->pgend = end;
-	range->purged = purged;
-
-	list_add_tail(&range->unpinned, &prev_range->unpinned);
-
-	if (range_on_lru(range))
-		lru_add(range);
-
-	return 0;
-}
-
-static void range_del(struct ashmem_range *range)
-{
-	list_del(&range->unpinned);
-	if (range_on_lru(range))
-		lru_del(range);
-	kmem_cache_free(ashmem_range_cachep, range);
-}
-
-/*
- * range_shrink - shrinks a range
- *
- * Caller must hold ashmem_mutex.
- */
-static inline void range_shrink(struct ashmem_range *range,
-				size_t start, size_t end)
-{
-	size_t pre = range_size(range);
-
-	range->pgstart = start;
-	range->pgend = end;
-
-	if (range_on_lru(range))
-		lru_count -= pre - range_size(range);
-}
-
-static int ashmem_open(struct inode *inode, struct file *file)
-{
-	struct ashmem_area *asma;
-	int ret;
-
-	ret = generic_file_open(inode, file);
-	if (unlikely(ret))
-		return ret;
-
-	asma = kmem_cache_zalloc(ashmem_area_cachep, GFP_KERNEL);
-	if (unlikely(!asma))
-		return -ENOMEM;
-
-	INIT_LIST_HEAD(&asma->unpinned_list);
-	memcpy(asma->name, ASHMEM_NAME_PREFIX, ASHMEM_NAME_PREFIX_LEN);
-	asma->prot_mask = PROT_MASK;
-	file->private_data = asma;
-
-	return 0;
-}
-
-static int ashmem_release(struct inode *ignored, struct file *file)
-{
-	struct ashmem_area *asma = file->private_data;
-	struct ashmem_range *range, *next;
-
-	mutex_lock(&ashmem_mutex);
-	list_for_each_entry_safe(range, next, &asma->unpinned_list, unpinned)
-		range_del(range);
-	mutex_unlock(&ashmem_mutex);
-
-	if (asma->file)
-		fput(asma->file);
-	kmem_cache_free(ashmem_area_cachep, asma);
-
-	return 0;
-}
-
-static ssize_t ashmem_read(struct file *file, char __user *buf,
-			   size_t len, loff_t *pos)
-{
-	struct ashmem_area *asma = file->private_data;
-	int ret = 0;
-
-	mutex_lock(&ashmem_mutex);
-
-	/* If size is not set, or set to 0, always return EOF. */
-	if (asma->size == 0) {
-		goto out_unlock;
-        }
-
-	if (!asma->file) {
-		ret = -EBADF;
-		goto out_unlock;
-	}
-
-	mutex_unlock(&ashmem_mutex);
-
-	/*
-	 * asma and asma->file are used outside the lock here.  We assume
-	 * once asma->file is set it will never be changed, and will not
-	 * be destroyed until all references to the file are dropped and
-	 * ashmem_release is called.
-	 */
-	ret = asma->file->f_op->read(asma->file, buf, len, pos);
-	if (ret >= 0) {
-		/** Update backing file pos, since f_ops->read() doesn't */
-		asma->file->f_pos = *pos;
-	}
-	return ret;
-
-out_unlock:
-	mutex_unlock(&ashmem_mutex);
-	return ret;
-}
-
-static loff_t ashmem_llseek(struct file *file, loff_t offset, int origin)
-{
-	struct ashmem_area *asma = file->private_data;
-	int ret;
-
-	mutex_lock(&ashmem_mutex);
-
-	if (asma->size == 0) {
-		ret = -EINVAL;
-		goto out;
-	}
-
-	if (!asma->file) {
-		ret = -EBADF;
-		goto out;
-	}
-
-	ret = asma->file->f_op->llseek(asma->file, offset, origin);
-	if (ret < 0) {
-		goto out;
-	}
-
-	/** Copy f_pos from backing file, since f_ops->llseek() sets it */
-	file->f_pos = asma->file->f_pos;
-
-out:
-	mutex_unlock(&ashmem_mutex);
-	return ret;
-}
-
-static inline unsigned long
-calc_vm_may_flags(unsigned long prot)
-{
-	return _calc_vm_trans(prot, PROT_READ,  VM_MAYREAD ) |
-	       _calc_vm_trans(prot, PROT_WRITE, VM_MAYWRITE) |
-	       _calc_vm_trans(prot, PROT_EXEC,  VM_MAYEXEC);
-}
-
-static int ashmem_mmap(struct file *file, struct vm_area_struct *vma)
-{
-	struct ashmem_area *asma = file->private_data;
-	int ret = 0;
-
-	mutex_lock(&ashmem_mutex);
-
-	/* user needs to SET_SIZE before mapping */
-	if (unlikely(!asma->size)) {
-		ret = -EINVAL;
-		goto out;
-	}
-
-	/* requested protection bits must match our allowed protection mask */
-	if (unlikely((vma->vm_flags & ~calc_vm_prot_bits(asma->prot_mask)) &
-						calc_vm_prot_bits(PROT_MASK))) {
-		ret = -EPERM;
-		goto out;
-	}
-	vma->vm_flags &= ~calc_vm_may_flags(~asma->prot_mask);
-
-	if (!asma->file) {
-		char *name = ASHMEM_NAME_DEF;
-		struct file *vmfile;
-
-		if (asma->name[ASHMEM_NAME_PREFIX_LEN] != '\0')
-			name = asma->name;
-
-		/* ... and allocate the backing shmem file */
-		vmfile = shmem_file_setup(name, asma->size, vma->vm_flags);
-		if (unlikely(IS_ERR(vmfile))) {
-			ret = PTR_ERR(vmfile);
-			goto out;
-		}
-		asma->file = vmfile;
-	}
-	get_file(asma->file);
-
-	if (vma->vm_flags & VM_SHARED)
-		shmem_set_file(vma, asma->file);
-	else {
-		if (vma->vm_file)
-			fput(vma->vm_file);
-		vma->vm_file = asma->file;
-	}
-	vma->vm_flags |= VM_CAN_NONLINEAR;
-
-out:
-	mutex_unlock(&ashmem_mutex);
-	return ret;
-}
-
-/*
- * ashmem_shrink - our cache shrinker, called from mm/vmscan.c :: shrink_slab
- *
- * 'nr_to_scan' is the number of objects (pages) to prune, or 0 to query how
- * many objects (pages) we have in total.
- *
- * 'gfp_mask' is the mask of the allocation that got us into this mess.
- *
- * Return value is the number of objects (pages) remaining, or -1 if we cannot
- * proceed without risk of deadlock (due to gfp_mask).
- *
- * We approximate LRU via least-recently-unpinned, jettisoning unpinned partial
- * chunks of ashmem regions LRU-wise one-at-a-time until we hit 'nr_to_scan'
- * pages freed.
- */
-static int ashmem_shrink(struct shrinker *s, struct shrink_control *sc)
-{
-	struct ashmem_range *range, *next;
-
-	/* We might recurse into filesystem code, so bail out if necessary */
-	if (sc->nr_to_scan && !(sc->gfp_mask & __GFP_FS))
-		return -1;
-	if (!sc->nr_to_scan)
-		return lru_count;
-
-	if (!mutex_trylock(&ashmem_mutex))
-		return -EBUSY;
-	list_for_each_entry_safe(range, next, &ashmem_lru_list, lru) {
-		struct inode *inode = range->asma->file->f_dentry->d_inode;
-		loff_t start = range->pgstart * PAGE_SIZE;
-		loff_t end = (range->pgend + 1) * PAGE_SIZE - 1;
-
-		vmtruncate_range(inode, start, end);
-		range->purged = ASHMEM_WAS_PURGED;
-		lru_del(range);
-
-		sc->nr_to_scan -= range_size(range);
-		if (sc->nr_to_scan <= 0)
-			break;
-	}
-	mutex_unlock(&ashmem_mutex);
-
-	return lru_count;
-}
-
-static struct shrinker ashmem_shrinker = {
-	.shrink = ashmem_shrink,
-	.seeks = DEFAULT_SEEKS * 4,
-};
-
-static int set_prot_mask(struct ashmem_area *asma, unsigned long prot)
-{
-	int ret = 0;
-
-	mutex_lock(&ashmem_mutex);
-
-	/* the user can only remove, not add, protection bits */
-	if (unlikely((asma->prot_mask & prot) != prot)) {
-		ret = -EINVAL;
-		goto out;
-	}
-
-	/* does the application expect PROT_READ to imply PROT_EXEC? */
-	if ((prot & PROT_READ) && (current->personality & READ_IMPLIES_EXEC))
-		prot |= PROT_EXEC;
-
-	asma->prot_mask = prot;
-
-out:
-	mutex_unlock(&ashmem_mutex);
-	return ret;
-}
-
-static int set_name(struct ashmem_area *asma, void __user *name)
-{
-	char lname[ASHMEM_NAME_LEN];
-	int len;
-	int ret = 0;
-
-	len = strncpy_from_user(lname, name, ASHMEM_NAME_LEN);
-	if (len < 0)
-		return len;
-	if (len == ASHMEM_NAME_LEN)
-		lname[ASHMEM_NAME_LEN - 1] = '\0';
-	mutex_lock(&ashmem_mutex);
-
-	/* cannot change an existing mapping's name */
-	if (unlikely(asma->file))
-		ret = -EINVAL;
-	else
-		strcpy(asma->name + ASHMEM_NAME_PREFIX_LEN, lname);
-
-	mutex_unlock(&ashmem_mutex);
-	return ret;
-}
-
-static int get_name(struct ashmem_area *asma, void __user *name)
-{
-	int ret = 0;
-	char lname[ASHMEM_NAME_LEN];
-	size_t len;
-
-	mutex_lock(&ashmem_mutex);
-	if (asma->name[ASHMEM_NAME_PREFIX_LEN] != '\0') {
-		/*
-		 * Copying only `len', instead of ASHMEM_NAME_LEN, bytes
-		 * prevents us from revealing one user's stack to another.
-		 */
-		len = strlen(asma->name + ASHMEM_NAME_PREFIX_LEN) + 1;
-		memcpy(lname, asma->name + ASHMEM_NAME_PREFIX_LEN, len);
-	} else {
-		len = strlen(ASHMEM_NAME_DEF) + 1;
-		memcpy(lname, ASHMEM_NAME_DEF, len);
-	}
-	mutex_unlock(&ashmem_mutex);
-	if (unlikely(copy_to_user(name, lname, len)))
-		ret = -EFAULT;
-	return ret;
-}
-
-/*
- * ashmem_pin - pin the given ashmem region, returning whether it was
- * previously purged (ASHMEM_WAS_PURGED) or not (ASHMEM_NOT_PURGED).
- *
- * Caller must hold ashmem_mutex.
- */
-static int ashmem_pin(struct ashmem_area *asma, size_t pgstart, size_t pgend)
-{
-	struct ashmem_range *range, *next;
-	int ret = ASHMEM_NOT_PURGED;
-
-	list_for_each_entry_safe(range, next, &asma->unpinned_list, unpinned) {
-		/* moved past last applicable page; we can short circuit */
-		if (range_before_page(range, pgstart))
-			break;
-
-		/*
-		 * The user can ask us to pin pages that span multiple ranges,
-		 * or to pin pages that aren't even unpinned, so this is messy.
-		 *
-		 * Four cases:
-		 * 1. The requested range subsumes an existing range, so we
-		 *    just remove the entire matching range.
-		 * 2. The requested range overlaps the start of an existing
-		 *    range, so we just update that range.
-		 * 3. The requested range overlaps the end of an existing
-		 *    range, so we just update that range.
-		 * 4. The requested range punches a hole in an existing range,
-		 *    so we have to update one side of the range and then
-		 *    create a new range for the other side.
-		 */
-		if (page_range_in_range(range, pgstart, pgend)) {
-			ret |= range->purged;
-
-			/* Case #1: Easy. Just nuke the whole thing. */
-			if (page_range_subsumes_range(range, pgstart, pgend)) {
-				range_del(range);
-				continue;
-			}
-
-			/* Case #2: We overlap from the start, so adjust it */
-			if (range->pgstart >= pgstart) {
-				range_shrink(range, pgend + 1, range->pgend);
-				continue;
-			}
-
-			/* Case #3: We overlap from the rear, so adjust it */
-			if (range->pgend <= pgend) {
-				range_shrink(range, range->pgstart, pgstart-1);
-				continue;
-			}
-
-			/*
-			 * Case #4: We eat a chunk out of the middle. A bit
-			 * more complicated, we allocate a new range for the
-			 * second half and adjust the first chunk's endpoint.
-			 */
-			range_alloc(asma, range, range->purged,
-				    pgend + 1, range->pgend);
-			range_shrink(range, range->pgstart, pgstart - 1);
-			break;
-		}
-	}
-
-	return ret;
-}
-
-/*
- * ashmem_unpin - unpin the given range of pages. Returns zero on success.
- *
- * Caller must hold ashmem_mutex.
- */
-static int ashmem_unpin(struct ashmem_area *asma, size_t pgstart, size_t pgend)
-{
-	struct ashmem_range *range, *next;
-	unsigned int purged = ASHMEM_NOT_PURGED;
-
-restart:
-	list_for_each_entry_safe(range, next, &asma->unpinned_list, unpinned) {
-		/* short circuit: this is our insertion point */
-		if (range_before_page(range, pgstart))
-			break;
-
-		/*
-		 * The user can ask us to unpin pages that are already entirely
-		 * or partially pinned. We handle those two cases here.
-		 */
-		if (page_range_subsumed_by_range(range, pgstart, pgend))
-			return 0;
-		if (page_range_in_range(range, pgstart, pgend)) {
-			pgstart = min_t(size_t, range->pgstart, pgstart),
-			pgend = max_t(size_t, range->pgend, pgend);
-			purged |= range->purged;
-			range_del(range);
-			goto restart;
-		}
-	}
-
-	return range_alloc(asma, range, purged, pgstart, pgend);
-}
-
-/*
- * ashmem_get_pin_status - Returns ASHMEM_IS_UNPINNED if _any_ pages in the
- * given interval are unpinned and ASHMEM_IS_PINNED otherwise.
- *
- * Caller must hold ashmem_mutex.
- */
-static int ashmem_get_pin_status(struct ashmem_area *asma, size_t pgstart,
-				 size_t pgend)
-{
-	struct ashmem_range *range;
-	int ret = ASHMEM_IS_PINNED;
-
-	list_for_each_entry(range, &asma->unpinned_list, unpinned) {
-		if (range_before_page(range, pgstart))
-			break;
-		if (page_range_in_range(range, pgstart, pgend)) {
-			ret = ASHMEM_IS_UNPINNED;
-			break;
-		}
-	}
-
-	return ret;
-}
-
-static int ashmem_pin_unpin(struct ashmem_area *asma, unsigned long cmd,
-			    void __user *p)
-{
-	struct ashmem_pin pin;
-	size_t pgstart, pgend;
-	int ret = -EINVAL;
-
-	if (unlikely(!asma->file))
-		return -EINVAL;
-
-	if (unlikely(copy_from_user(&pin, p, sizeof(pin))))
-		return -EFAULT;
-
-	/* per custom, you can pass zero for len to mean "everything onward" */
-	if (!pin.len)
-		pin.len = PAGE_ALIGN(asma->size) - pin.offset;
-
-	if (unlikely((pin.offset | pin.len) & ~PAGE_MASK))
-		return -EINVAL;
-
-	if (unlikely(((__u32) -1) - pin.offset < pin.len))
-		return -EINVAL;
-
-	if (unlikely(PAGE_ALIGN(asma->size) < pin.offset + pin.len))
-		return -EINVAL;
-
-	pgstart = pin.offset / PAGE_SIZE;
-	pgend = pgstart + (pin.len / PAGE_SIZE) - 1;
-
-	mutex_lock(&ashmem_mutex);
-
-	switch (cmd) {
-	case ASHMEM_PIN:
-		ret = ashmem_pin(asma, pgstart, pgend);
-		break;
-	case ASHMEM_UNPIN:
-		ret = ashmem_unpin(asma, pgstart, pgend);
-		break;
-	case ASHMEM_GET_PIN_STATUS:
-		ret = ashmem_get_pin_status(asma, pgstart, pgend);
-		break;
-	}
-
-	mutex_unlock(&ashmem_mutex);
-
-	return ret;
-}
-
-static long ashmem_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
-{
-	struct ashmem_area *asma = file->private_data;
-	long ret = -ENOTTY;
-
-	switch (cmd) {
-	case ASHMEM_SET_NAME:
-		ret = set_name(asma, (void __user *) arg);
-		break;
-	case ASHMEM_GET_NAME:
-		ret = get_name(asma, (void __user *) arg);
-		break;
-	case ASHMEM_SET_SIZE:
-		ret = -EINVAL;
-		if (!asma->file) {
-			ret = 0;
-			asma->size = (size_t) arg;
-		}
-		break;
-	case ASHMEM_GET_SIZE:
-		ret = asma->size;
-		break;
-	case ASHMEM_SET_PROT_MASK:
-		ret = set_prot_mask(asma, arg);
-		break;
-	case ASHMEM_GET_PROT_MASK:
-		ret = asma->prot_mask;
-		break;
-	case ASHMEM_PIN:
-	case ASHMEM_UNPIN:
-	case ASHMEM_GET_PIN_STATUS:
-		ret = ashmem_pin_unpin(asma, cmd, (void __user *) arg);
-		break;
-	case ASHMEM_PURGE_ALL_CACHES:
-		ret = -EPERM;
-		if (capable(CAP_SYS_ADMIN)) {
-			struct shrink_control sc = {
-				.gfp_mask = GFP_KERNEL,
-				.nr_to_scan = 0,
-			};
-			ret = ashmem_shrink(&ashmem_shrinker, &sc);
-			sc.nr_to_scan = ret;
-			ashmem_shrink(&ashmem_shrinker, &sc);
-		}
-		break;
-	}
-
-	return ret;
-}
-
-static struct file_operations ashmem_fops = {
-	.owner = THIS_MODULE,
-	.open = ashmem_open,
-	.release = ashmem_release,
-        .read = ashmem_read,
-        .llseek = ashmem_llseek,
-	.mmap = ashmem_mmap,
-	.unlocked_ioctl = ashmem_ioctl,
-	.compat_ioctl = ashmem_ioctl,
-};
-
-static struct miscdevice ashmem_misc = {
-	.minor = MISC_DYNAMIC_MINOR,
-	.name = "ashmem",
-	.fops = &ashmem_fops,
-};
-
-static int __init ashmem_init(void)
-{
-	int ret;
-
-	ashmem_area_cachep = kmem_cache_create("ashmem_area_cache",
-					  sizeof(struct ashmem_area),
-					  0, 0, NULL);
-	if (unlikely(!ashmem_area_cachep)) {
-		printk(KERN_ERR "ashmem: failed to create slab cache\n");
-		return -ENOMEM;
-	}
-
-	ashmem_range_cachep = kmem_cache_create("ashmem_range_cache",
-					  sizeof(struct ashmem_range),
-					  0, 0, NULL);
-	if (unlikely(!ashmem_range_cachep)) {
-		printk(KERN_ERR "ashmem: failed to create slab cache\n");
-		return -ENOMEM;
-	}
-
-	ret = misc_register(&ashmem_misc);
-	if (unlikely(ret)) {
-		printk(KERN_ERR "ashmem: failed to register misc device!\n");
-		return ret;
-	}
-
-	register_shrinker(&ashmem_shrinker);
-
-	printk(KERN_INFO "ashmem: initialized\n");
-
-	return 0;
-}
-
-static void __exit ashmem_exit(void)
-{
-	int ret;
-
-	unregister_shrinker(&ashmem_shrinker);
-
-	ret = misc_deregister(&ashmem_misc);
-	if (unlikely(ret))
-		printk(KERN_ERR "ashmem: failed to unregister misc device!\n");
-
-	kmem_cache_destroy(ashmem_range_cachep);
-	kmem_cache_destroy(ashmem_area_cachep);
-
-	printk(KERN_INFO "ashmem: unloaded\n");
-}
-
-module_init(ashmem_init);
-module_exit(ashmem_exit);
-
-MODULE_LICENSE("GPL");