1 files changed, 0 insertions, 755 deletions

diff --git a/drivers/staging/zsmalloc/zsmalloc-main.c b/drivers/staging/zsmalloc/zsmalloc-main.c
deleted file mode 100644
index 44967377328..00000000000
--- a/drivers/staging/zsmalloc/zsmalloc-main.c
+++ /dev/null
@@ -1,755 +0,0 @@
-/*
- * zsmalloc memory allocator
- *
- * Copyright (C) 2011  Nitin Gupta
- *
- * This code is released using a dual license strategy: BSD/GPL
- * You can choose the license that better fits your requirements.
- *
- * Released under the terms of 3-clause BSD License
- * Released under the terms of GNU General Public License Version 2.0
- */
-
-#ifdef CONFIG_ZSMALLOC_DEBUG
-#define DEBUG
-#endif
-
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/bitops.h>
-#include <linux/errno.h>
-#include <linux/highmem.h>
-#include <linux/init.h>
-#include <linux/string.h>
-#include <linux/slab.h>
-#include <asm/tlbflush.h>
-#include <asm/pgtable.h>
-#include <linux/cpumask.h>
-#include <linux/cpu.h>
-#include <linux/vmalloc.h>
-
-#include "zsmalloc.h"
-#include "zsmalloc_int.h"
-
-/*
- * A zspage's class index and fullness group
- * are encoded in its (first)page->mapping
- */
-#define CLASS_IDX_BITS	28
-#define FULLNESS_BITS	4
-#define CLASS_IDX_MASK	((1 << CLASS_IDX_BITS) - 1)
-#define FULLNESS_MASK	((1 << FULLNESS_BITS) - 1)
-
-/* per-cpu VM mapping areas for zspage accesses that cross page boundaries */
-static DEFINE_PER_CPU(struct mapping_area, zs_map_area);
-
-static int is_first_page(struct page *page)
-{
-	return PagePrivate(page);
-}
-
-static int is_last_page(struct page *page)
-{
-	return PagePrivate2(page);
-}
-
-static void get_zspage_mapping(struct page *page, unsigned int *class_idx,
-				enum fullness_group *fullness)
-{
-	unsigned long m;
-	BUG_ON(!is_first_page(page));
-
-	m = (unsigned long)page->mapping;
-	*fullness = m & FULLNESS_MASK;
-	*class_idx = (m >> FULLNESS_BITS) & CLASS_IDX_MASK;
-}
-
-static void set_zspage_mapping(struct page *page, unsigned int class_idx,
-				enum fullness_group fullness)
-{
-	unsigned long m;
-	BUG_ON(!is_first_page(page));
-
-	m = ((class_idx & CLASS_IDX_MASK) << FULLNESS_BITS) |
-			(fullness & FULLNESS_MASK);
-	page->mapping = (struct address_space *)m;
-}
-
-static int get_size_class_index(int size)
-{
-	int idx = 0;
-
-	if (likely(size > ZS_MIN_ALLOC_SIZE))
-		idx = DIV_ROUND_UP(size - ZS_MIN_ALLOC_SIZE,
-				ZS_SIZE_CLASS_DELTA);
-
-	return idx;
-}
-
-static enum fullness_group get_fullness_group(struct page *page)
-{
-	int inuse, max_objects;
-	enum fullness_group fg;
-	BUG_ON(!is_first_page(page));
-
-	inuse = page->inuse;
-	max_objects = page->objects;
-
-	if (inuse == 0)
-		fg = ZS_EMPTY;
-	else if (inuse == max_objects)
-		fg = ZS_FULL;
-	else if (inuse <= max_objects / fullness_threshold_frac)
-		fg = ZS_ALMOST_EMPTY;
-	else
-		fg = ZS_ALMOST_FULL;
-
-	return fg;
-}
-
-static void insert_zspage(struct page *page, struct size_class *class,
-				enum fullness_group fullness)
-{
-	struct page **head;
-
-	BUG_ON(!is_first_page(page));
-
-	if (fullness >= _ZS_NR_FULLNESS_GROUPS)
-		return;
-
-	head = &class->fullness_list[fullness];
-	if (*head)
-		list_add_tail(&page->lru, &(*head)->lru);
-
-	*head = page;
-}
-
-static void remove_zspage(struct page *page, struct size_class *class,
-				enum fullness_group fullness)
-{
-	struct page **head;
-
-	BUG_ON(!is_first_page(page));
-
-	if (fullness >= _ZS_NR_FULLNESS_GROUPS)
-		return;
-
-	head = &class->fullness_list[fullness];
-	BUG_ON(!*head);
-	if (list_empty(&(*head)->lru))
-		*head = NULL;
-	else if (*head == page)
-		*head = (struct page *)list_entry((*head)->lru.next,
-					struct page, lru);
-
-	list_del_init(&page->lru);
-}
-
-static enum fullness_group fix_fullness_group(struct zs_pool *pool,
-						struct page *page)
-{
-	int class_idx;
-	struct size_class *class;
-	enum fullness_group currfg, newfg;
-
-	BUG_ON(!is_first_page(page));
-
-	get_zspage_mapping(page, &class_idx, &currfg);
-	newfg = get_fullness_group(page);
-	if (newfg == currfg)
-		goto out;
-
-	class = &pool->size_class[class_idx];
-	remove_zspage(page, class, currfg);
-	insert_zspage(page, class, newfg);
-	set_zspage_mapping(page, class_idx, newfg);
-
-out:
-	return newfg;
-}
-
-/*
- * We have to decide on how many pages to link together
- * to form a zspage for each size class. This is important
- * to reduce wastage due to unusable space left at end of
- * each zspage which is given as:
- *	wastage = Zp - Zp % size_class
- * where Zp = zspage size = k * PAGE_SIZE where k = 1, 2, ...
- *
- * For example, for size class of 3/8 * PAGE_SIZE, we should
- * link together 3 PAGE_SIZE sized pages to form a zspage
- * since then we can perfectly fit in 8 such objects.
- */
-static int get_pages_per_zspage(int class_size)
-{
-	int i, max_usedpc = 0;
-	/* zspage order which gives maximum used size per KB */
-	int max_usedpc_order = 1;
-
-	for (i = 1; i <= ZS_MAX_PAGES_PER_ZSPAGE; i++) {
-		int zspage_size;
-		int waste, usedpc;
-
-		zspage_size = i * PAGE_SIZE;
-		waste = zspage_size % class_size;
-		usedpc = (zspage_size - waste) * 100 / zspage_size;
-
-		if (usedpc > max_usedpc) {
-			max_usedpc = usedpc;
-			max_usedpc_order = i;
-		}
-	}
-
-	return max_usedpc_order;
-}
-
-/*
- * A single 'zspage' is composed of many system pages which are
- * linked together using fields in struct page. This function finds
- * the first/head page, given any component page of a zspage.
- */
-static struct page *get_first_page(struct page *page)
-{
-	if (is_first_page(page))
-		return page;
-	else
-		return page->first_page;
-}
-
-static struct page *get_next_page(struct page *page)
-{
-	struct page *next;
-
-	if (is_last_page(page))
-		next = NULL;
-	else if (is_first_page(page))
-		next = (struct page *)page->private;
-	else
-		next = list_entry(page->lru.next, struct page, lru);
-
-	return next;
-}
-
-/* Encode <page, obj_idx> as a single handle value */
-static void *obj_location_to_handle(struct page *page, unsigned long obj_idx)
-{
-	unsigned long handle;
-
-	if (!page) {
-		BUG_ON(obj_idx);
-		return NULL;
-	}
-
-	handle = page_to_pfn(page) << OBJ_INDEX_BITS;
-	handle |= (obj_idx & OBJ_INDEX_MASK);
-
-	return (void *)handle;
-}
-
-/* Decode <page, obj_idx> pair from the given object handle */
-static void obj_handle_to_location(void *handle, struct page **page,
-				unsigned long *obj_idx)
-{
-	unsigned long hval = (unsigned long)handle;
-
-	*page = pfn_to_page(hval >> OBJ_INDEX_BITS);
-	*obj_idx = hval & OBJ_INDEX_MASK;
-}
-
-static unsigned long obj_idx_to_offset(struct page *page,
-				unsigned long obj_idx, int class_size)
-{
-	unsigned long off = 0;
-
-	if (!is_first_page(page))
-		off = page->index;
-
-	return off + obj_idx * class_size;
-}
-
-static void reset_page(struct page *page)
-{
-	clear_bit(PG_private, &page->flags);
-	clear_bit(PG_private_2, &page->flags);
-	set_page_private(page, 0);
-	page->mapping = NULL;
-	page->freelist = NULL;
-	reset_page_mapcount(page);
-}
-
-static void free_zspage(struct page *first_page)
-{
-	struct page *nextp, *tmp, *head_extra;
-
-	BUG_ON(!is_first_page(first_page));
-	BUG_ON(first_page->inuse);
-
-	head_extra = (struct page *)page_private(first_page);
-
-	reset_page(first_page);
-	__free_page(first_page);
-
-	/* zspage with only 1 system page */
-	if (!head_extra)
-		return;
-
-	list_for_each_entry_safe(nextp, tmp, &head_extra->lru, lru) {
-		list_del(&nextp->lru);
-		reset_page(nextp);
-		__free_page(nextp);
-	}
-	reset_page(head_extra);
-	__free_page(head_extra);
-}
-
-/* Initialize a newly allocated zspage */
-static void init_zspage(struct page *first_page, struct size_class *class)
-{
-	unsigned long off = 0;
-	struct page *page = first_page;
-
-	BUG_ON(!is_first_page(first_page));
-	while (page) {
-		struct page *next_page;
-		struct link_free *link;
-		unsigned int i, objs_on_page;
-
-		/*
-		 * page->index stores offset of first object starting
-		 * in the page. For the first page, this is always 0,
-		 * so we use first_page->index (aka ->freelist) to store
-		 * head of corresponding zspage's freelist.
-		 */
-		if (page != first_page)
-			page->index = off;
-
-		link = (struct link_free *)kmap_atomic(page) +
-						off / sizeof(*link);
-		objs_on_page = (PAGE_SIZE - off) / class->size;
-
-		for (i = 1; i <= objs_on_page; i++) {
-			off += class->size;
-			if (off < PAGE_SIZE) {
-				link->next = obj_location_to_handle(page, i);
-				link += class->size / sizeof(*link);
-			}
-		}
-
-		/*
-		 * We now come to the last (full or partial) object on this
-		 * page, which must point to the first object on the next
-		 * page (if present)
-		 */
-		next_page = get_next_page(page);
-		link->next = obj_location_to_handle(next_page, 0);
-		kunmap_atomic(link);
-		page = next_page;
-		off = (off + class->size) % PAGE_SIZE;
-	}
-}
-
-/*
- * Allocate a zspage for the given size class
- */
-static struct page *alloc_zspage(struct size_class *class, gfp_t flags)
-{
-	int i, error;
-	struct page *first_page = NULL;
-
-	/*
-	 * Allocate individual pages and link them together as:
-	 * 1. first page->private = first sub-page
-	 * 2. all sub-pages are linked together using page->lru
-	 * 3. each sub-page is linked to the first page using page->first_page
-	 *
-	 * For each size class, First/Head pages are linked together using
-	 * page->lru. Also, we set PG_private to identify the first page
-	 * (i.e. no other sub-page has this flag set) and PG_private_2 to
-	 * identify the last page.
-	 */
-	error = -ENOMEM;
-	for (i = 0; i < class->pages_per_zspage; i++) {
-		struct page *page, *prev_page;
-
-		page = alloc_page(flags);
-		if (!page)
-			goto cleanup;
-
-		INIT_LIST_HEAD(&page->lru);
-		if (i == 0) {	/* first page */
-			SetPagePrivate(page);
-			set_page_private(page, 0);
-			first_page = page;
-			first_page->inuse = 0;
-		}
-		if (i == 1)
-			first_page->private = (unsigned long)page;
-		if (i >= 1)
-			page->first_page = first_page;
-		if (i >= 2)
-			list_add(&page->lru, &prev_page->lru);
-		if (i == class->pages_per_zspage - 1)	/* last page */
-			SetPagePrivate2(page);
-		prev_page = page;
-	}
-
-	init_zspage(first_page, class);
-
-	first_page->freelist = obj_location_to_handle(first_page, 0);
-	/* Maximum number of objects we can store in this zspage */
-	first_page->objects = class->pages_per_zspage * PAGE_SIZE / class->size;
-
-	error = 0; /* Success */
-
-cleanup:
-	if (unlikely(error) && first_page) {
-		free_zspage(first_page);
-		first_page = NULL;
-	}
-
-	return first_page;
-}
-
-static struct page *find_get_zspage(struct size_class *class)
-{
-	int i;
-	struct page *page;
-
-	for (i = 0; i < _ZS_NR_FULLNESS_GROUPS; i++) {
-		page = class->fullness_list[i];
-		if (page)
-			break;
-	}
-
-	return page;
-}
-
-
-/*
- * If this becomes a separate module, register zs_init() with
- * module_init(), zs_exit with module_exit(), and remove zs_initialized
-*/
-static int zs_initialized;
-
-static int zs_cpu_notifier(struct notifier_block *nb, unsigned long action,
-				void *pcpu)
-{
-	int cpu = (long)pcpu;
-	struct mapping_area *area;
-
-	switch (action) {
-	case CPU_UP_PREPARE:
-		area = &per_cpu(zs_map_area, cpu);
-		if (area->vm)
-			break;
-		area->vm = alloc_vm_area(2 * PAGE_SIZE, area->vm_ptes);
-		if (!area->vm)
-			return notifier_from_errno(-ENOMEM);
-		break;
-	case CPU_DEAD:
-	case CPU_UP_CANCELED:
-		area = &per_cpu(zs_map_area, cpu);
-		if (area->vm)
-			free_vm_area(area->vm);
-		area->vm = NULL;
-		break;
-	}
-
-	return NOTIFY_OK;
-}
-
-static struct notifier_block zs_cpu_nb = {
-	.notifier_call = zs_cpu_notifier
-};
-
-static void zs_exit(void)
-{
-	int cpu;
-
-	for_each_online_cpu(cpu)
-		zs_cpu_notifier(NULL, CPU_DEAD, (void *)(long)cpu);
-	unregister_cpu_notifier(&zs_cpu_nb);
-}
-
-static int zs_init(void)
-{
-	int cpu, ret;
-
-	register_cpu_notifier(&zs_cpu_nb);
-	for_each_online_cpu(cpu) {
-		ret = zs_cpu_notifier(NULL, CPU_UP_PREPARE, (void *)(long)cpu);
-		if (notifier_to_errno(ret))
-			goto fail;
-	}
-	return 0;
-fail:
-	zs_exit();
-	return notifier_to_errno(ret);
-}
-
-struct zs_pool *zs_create_pool(const char *name, gfp_t flags)
-{
-	int i, error, ovhd_size;
-	struct zs_pool *pool;
-
-	if (!name)
-		return NULL;
-
-	ovhd_size = roundup(sizeof(*pool), PAGE_SIZE);
-	pool = kzalloc(ovhd_size, GFP_KERNEL);
-	if (!pool)
-		return NULL;
-
-	for (i = 0; i < ZS_SIZE_CLASSES; i++) {
-		int size;
-		struct size_class *class;
-
-		size = ZS_MIN_ALLOC_SIZE + i * ZS_SIZE_CLASS_DELTA;
-		if (size > ZS_MAX_ALLOC_SIZE)
-			size = ZS_MAX_ALLOC_SIZE;
-
-		class = &pool->size_class[i];
-		class->size = size;
-		class->index = i;
-		spin_lock_init(&class->lock);
-		class->pages_per_zspage = get_pages_per_zspage(size);
-
-	}
-
-	/*
-	 * If this becomes a separate module, register zs_init with
-	 * module_init, and remove this block
-	*/
-	if (!zs_initialized) {
-		error = zs_init();
-		if (error)
-			goto cleanup;
-		zs_initialized = 1;
-	}
-
-	pool->flags = flags;
-	pool->name = name;
-
-	error = 0; /* Success */
-
-cleanup:
-	if (error) {
-		zs_destroy_pool(pool);
-		pool = NULL;
-	}
-
-	return pool;
-}
-EXPORT_SYMBOL_GPL(zs_create_pool);
-
-void zs_destroy_pool(struct zs_pool *pool)
-{
-	int i;
-
-	for (i = 0; i < ZS_SIZE_CLASSES; i++) {
-		int fg;
-		struct size_class *class = &pool->size_class[i];
-
-		for (fg = 0; fg < _ZS_NR_FULLNESS_GROUPS; fg++) {
-			if (class->fullness_list[fg]) {
-				pr_info("Freeing non-empty class with size "
-					"%db, fullness group %d\n",
-					class->size, fg);
-			}
-		}
-	}
-	kfree(pool);
-}
-EXPORT_SYMBOL_GPL(zs_destroy_pool);
-
-/**
- * zs_malloc - Allocate block of given size from pool.
- * @pool: pool to allocate from
- * @size: size of block to allocate
- *
- * On success, handle to the allocated object is returned,
- * otherwise NULL.
- * Allocation requests with size > ZS_MAX_ALLOC_SIZE will fail.
- */
-void *zs_malloc(struct zs_pool *pool, size_t size)
-{
-	void *obj;
-	struct link_free *link;
-	int class_idx;
-	struct size_class *class;
-
-	struct page *first_page, *m_page;
-	unsigned long m_objidx, m_offset;
-
-	if (unlikely(!size || size > ZS_MAX_ALLOC_SIZE))
-		return NULL;
-
-	class_idx = get_size_class_index(size);
-	class = &pool->size_class[class_idx];
-	BUG_ON(class_idx != class->index);
-
-	spin_lock(&class->lock);
-	first_page = find_get_zspage(class);
-
-	if (!first_page) {
-		spin_unlock(&class->lock);
-		first_page = alloc_zspage(class, pool->flags);
-		if (unlikely(!first_page))
-			return NULL;
-
-		set_zspage_mapping(first_page, class->index, ZS_EMPTY);
-		spin_lock(&class->lock);
-		class->pages_allocated += class->pages_per_zspage;
-	}
-
-	obj = first_page->freelist;
-	obj_handle_to_location(obj, &m_page, &m_objidx);
-	m_offset = obj_idx_to_offset(m_page, m_objidx, class->size);
-
-	link = (struct link_free *)kmap_atomic(m_page) +
-					m_offset / sizeof(*link);
-	first_page->freelist = link->next;
-	memset(link, POISON_INUSE, sizeof(*link));
-	kunmap_atomic(link);
-
-	first_page->inuse++;
-	/* Now move the zspage to another fullness group, if required */
-	fix_fullness_group(pool, first_page);
-	spin_unlock(&class->lock);
-
-	return obj;
-}
-EXPORT_SYMBOL_GPL(zs_malloc);
-
-void zs_free(struct zs_pool *pool, void *obj)
-{
-	struct link_free *link;
-	struct page *first_page, *f_page;
-	unsigned long f_objidx, f_offset;
-
-	int class_idx;
-	struct size_class *class;
-	enum fullness_group fullness;
-
-	if (unlikely(!obj))
-		return;
-
-	obj_handle_to_location(obj, &f_page, &f_objidx);
-	first_page = get_first_page(f_page);
-
-	get_zspage_mapping(first_page, &class_idx, &fullness);
-	class = &pool->size_class[class_idx];
-	f_offset = obj_idx_to_offset(f_page, f_objidx, class->size);
-
-	spin_lock(&class->lock);
-
-	/* Insert this object in containing zspage's freelist */
-	link = (struct link_free *)((unsigned char *)kmap_atomic(f_page)
-							+ f_offset);
-	link->next = first_page->freelist;
-	kunmap_atomic(link);
-	first_page->freelist = obj;
-
-	first_page->inuse--;
-	fullness = fix_fullness_group(pool, first_page);
-
-	if (fullness == ZS_EMPTY)
-		class->pages_allocated -= class->pages_per_zspage;
-
-	spin_unlock(&class->lock);
-
-	if (fullness == ZS_EMPTY)
-		free_zspage(first_page);
-}
-EXPORT_SYMBOL_GPL(zs_free);
-
-/**
- * zs_map_object - get address of allocated object from handle.
- * @pool: pool from which the object was allocated
- * @handle: handle returned from zs_malloc
- *
- * Before using an object allocated from zs_malloc, it must be mapped using
- * this function. When done with the object, it must be unmapped using
- * zs_unmap_object
-*/
-void *zs_map_object(struct zs_pool *pool, void *handle)
-{
-	struct page *page;
-	unsigned long obj_idx, off;
-
-	unsigned int class_idx;
-	enum fullness_group fg;
-	struct size_class *class;
-	struct mapping_area *area;
-
-	BUG_ON(!handle);
-
-	obj_handle_to_location(handle, &page, &obj_idx);
-	get_zspage_mapping(get_first_page(page), &class_idx, &fg);
-	class = &pool->size_class[class_idx];
-	off = obj_idx_to_offset(page, obj_idx, class->size);
-
-	area = &get_cpu_var(zs_map_area);
-	if (off + class->size <= PAGE_SIZE) {
-		/* this object is contained entirely within a page */
-		area->vm_addr = kmap_atomic(page);
-	} else {
-		/* this object spans two pages */
-		struct page *nextp;
-
-		nextp = get_next_page(page);
-		BUG_ON(!nextp);
-
-
-		set_pte(area->vm_ptes[0], mk_pte(page, PAGE_KERNEL));
-		set_pte(area->vm_ptes[1], mk_pte(nextp, PAGE_KERNEL));
-
-		/* We pre-allocated VM area so mapping can never fail */
-		area->vm_addr = area->vm->addr;
-	}
-
-	return area->vm_addr + off;
-}
-EXPORT_SYMBOL_GPL(zs_map_object);
-
-void zs_unmap_object(struct zs_pool *pool, void *handle)
-{
-	struct page *page;
-	unsigned long obj_idx, off;
-
-	unsigned int class_idx;
-	enum fullness_group fg;
-	struct size_class *class;
-	struct mapping_area *area;
-
-	BUG_ON(!handle);
-
-	obj_handle_to_location(handle, &page, &obj_idx);
-	get_zspage_mapping(get_first_page(page), &class_idx, &fg);
-	class = &pool->size_class[class_idx];
-	off = obj_idx_to_offset(page, obj_idx, class->size);
-
-	area = &__get_cpu_var(zs_map_area);
-	if (off + class->size <= PAGE_SIZE) {
-		kunmap_atomic(area->vm_addr);
-	} else {
-		set_pte(area->vm_ptes[0], __pte(0));
-		set_pte(area->vm_ptes[1], __pte(0));
-		__flush_tlb_one((unsigned long)area->vm_addr);
-		__flush_tlb_one((unsigned long)area->vm_addr + PAGE_SIZE);
-	}
-	put_cpu_var(zs_map_area);
-}
-EXPORT_SYMBOL_GPL(zs_unmap_object);
-
-u64 zs_get_total_size_bytes(struct zs_pool *pool)
-{
-	int i;
-	u64 npages = 0;
-
-	for (i = 0; i < ZS_SIZE_CLASSES; i++)
-		npages += pool->size_class[i].pages_allocated;
-
-	return npages << PAGE_SHIFT;
-}
-EXPORT_SYMBOL_GPL(zs_get_total_size_bytes);