Commit a862f68a authored by Mike Rapoport's avatar Mike Rapoport Committed by Linus Torvalds

docs/core-api/mm: fix return value descriptions in mm/

Many kernel-doc comments in mm/ have the return value descriptions
either misformatted or omitted at all which makes kernel-doc script
unhappy:

$ make V=1 htmldocs
...
./mm/util.c:36: info: Scanning doc for kstrdup
./mm/util.c:41: warning: No description found for return value of 'kstrdup'
./mm/util.c:57: info: Scanning doc for kstrdup_const
./mm/util.c:66: warning: No description found for return value of 'kstrdup_const'
./mm/util.c:75: info: Scanning doc for kstrndup
./mm/util.c:83: warning: No description found for return value of 'kstrndup'
...

Fixing the formatting and adding the missing return value descriptions
eliminates ~100 such warnings.

Link: http://lkml.kernel.org/r/1549549644-4903-4-git-send-email-rppt@linux.ibm.comSigned-off-by: default avatarMike Rapoport <rppt@linux.ibm.com>
Reviewed-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent bc8ff3ca
......@@ -114,10 +114,9 @@ static DEVICE_ATTR(pools, 0444, show_pools, NULL);
* @size: size of the blocks in this pool.
* @align: alignment requirement for blocks; must be a power of two
* @boundary: returned blocks won't cross this power of two boundary
* Context: !in_interrupt()
* Context: not in_interrupt()
*
* Returns a dma allocation pool with the requested characteristics, or
* null if one can't be created. Given one of these pools, dma_pool_alloc()
* Given one of these pools, dma_pool_alloc()
* may be used to allocate memory. Such memory will all have "consistent"
* DMA mappings, accessible by the device and its driver without using
* cache flushing primitives. The actual size of blocks allocated may be
......@@ -127,6 +126,9 @@ static DEVICE_ATTR(pools, 0444, show_pools, NULL);
* cross that size boundary. This is useful for devices which have
* addressing restrictions on individual DMA transfers, such as not crossing
* boundaries of 4KBytes.
*
* Return: a dma allocation pool with the requested characteristics, or
* %NULL if one can't be created.
*/
struct dma_pool *dma_pool_create(const char *name, struct device *dev,
size_t size, size_t align, size_t boundary)
......@@ -313,7 +315,7 @@ EXPORT_SYMBOL(dma_pool_destroy);
* @mem_flags: GFP_* bitmask
* @handle: pointer to dma address of block
*
* This returns the kernel virtual address of a currently unused block,
* Return: the kernel virtual address of a currently unused block,
* and reports its dma address through the handle.
* If such a memory block can't be allocated, %NULL is returned.
*/
......@@ -498,6 +500,9 @@ static int dmam_pool_match(struct device *dev, void *res, void *match_data)
*
* Managed dma_pool_create(). DMA pool created with this function is
* automatically destroyed on driver detach.
*
* Return: a managed dma allocation pool with the requested
* characteristics, or %NULL if one can't be created.
*/
struct dma_pool *dmam_pool_create(const char *name, struct device *dev,
size_t size, size_t align, size_t allocation)
......
This diff is collapsed.
......@@ -1504,6 +1504,8 @@ static int insert_page(struct vm_area_struct *vma, unsigned long addr,
* under mm->mmap_sem write-lock, so it can change vma->vm_flags.
* Caller must set VM_MIXEDMAP on vma if it wants to call this
* function from other places, for example from page-fault handler.
*
* Return: %0 on success, negative error code otherwise.
*/
int vm_insert_page(struct vm_area_struct *vma, unsigned long addr,
struct page *page)
......@@ -1832,6 +1834,8 @@ static inline int remap_p4d_range(struct mm_struct *mm, pgd_t *pgd,
* @prot: page protection flags for this mapping
*
* Note: this is only safe if the mm semaphore is held when called.
*
* Return: %0 on success, negative error code otherwise.
*/
int remap_pfn_range(struct vm_area_struct *vma, unsigned long addr,
unsigned long pfn, unsigned long size, pgprot_t prot)
......@@ -1904,6 +1908,8 @@ EXPORT_SYMBOL(remap_pfn_range);
*
* NOTE! Some drivers might want to tweak vma->vm_page_prot first to get
* whatever write-combining details or similar.
*
* Return: %0 on success, negative error code otherwise.
*/
int vm_iomap_memory(struct vm_area_struct *vma, phys_addr_t start, unsigned long len)
{
......@@ -2382,12 +2388,13 @@ static vm_fault_t wp_page_copy(struct vm_fault *vmf)
*
* This function handles all that is needed to finish a write page fault in a
* shared mapping due to PTE being read-only once the mapped page is prepared.
* It handles locking of PTE and modifying it. The function returns
* VM_FAULT_WRITE on success, 0 when PTE got changed before we acquired PTE
* lock.
* It handles locking of PTE and modifying it.
*
* The function expects the page to be locked or other protection against
* concurrent faults / writeback (such as DAX radix tree locks).
*
* Return: %VM_FAULT_WRITE on success, %0 when PTE got changed before
* we acquired PTE lock.
*/
vm_fault_t finish_mkwrite_fault(struct vm_fault *vmf)
{
......@@ -3214,6 +3221,8 @@ static vm_fault_t do_set_pmd(struct vm_fault *vmf, struct page *page)
*
* Target users are page handler itself and implementations of
* vm_ops->map_pages.
*
* Return: %0 on success, %VM_FAULT_ code in case of error.
*/
vm_fault_t alloc_set_pte(struct vm_fault *vmf, struct mem_cgroup *memcg,
struct page *page)
......@@ -3274,11 +3283,12 @@ vm_fault_t alloc_set_pte(struct vm_fault *vmf, struct mem_cgroup *memcg,
* This function handles all that is needed to finish a page fault once the
* page to fault in is prepared. It handles locking of PTEs, inserts PTE for
* given page, adds reverse page mapping, handles memcg charges and LRU
* addition. The function returns 0 on success, VM_FAULT_ code in case of
* error.
* addition.
*
* The function expects the page to be locked and on success it consumes a
* reference of a page being mapped (for the PTE which maps it).
*
* Return: %0 on success, %VM_FAULT_ code in case of error.
*/
vm_fault_t finish_fault(struct vm_fault *vmf)
{
......@@ -4159,7 +4169,7 @@ EXPORT_SYMBOL(follow_pte_pmd);
*
* Only IO mappings and raw PFN mappings are allowed.
*
* Returns zero and the pfn at @pfn on success, -ve otherwise.
* Return: zero and the pfn at @pfn on success, -ve otherwise.
*/
int follow_pfn(struct vm_area_struct *vma, unsigned long address,
unsigned long *pfn)
......@@ -4309,6 +4319,8 @@ int __access_remote_vm(struct task_struct *tsk, struct mm_struct *mm,
* @gup_flags: flags modifying lookup behaviour
*
* The caller must hold a reference on @mm.
*
* Return: number of bytes copied from source to destination.
*/
int access_remote_vm(struct mm_struct *mm, unsigned long addr,
void *buf, int len, unsigned int gup_flags)
......
......@@ -222,6 +222,8 @@ EXPORT_SYMBOL(mempool_init_node);
*
* Like mempool_create(), but initializes the pool in (i.e. embedded in another
* structure).
*
* Return: %0 on success, negative error code otherwise.
*/
int mempool_init(mempool_t *pool, int min_nr, mempool_alloc_t *alloc_fn,
mempool_free_t *free_fn, void *pool_data)
......@@ -245,6 +247,8 @@ EXPORT_SYMBOL(mempool_init);
* functions. This function might sleep. Both the alloc_fn() and the free_fn()
* functions might sleep - as long as the mempool_alloc() function is not called
* from IRQ contexts.
*
* Return: pointer to the created memory pool object or %NULL on error.
*/
mempool_t *mempool_create(int min_nr, mempool_alloc_t *alloc_fn,
mempool_free_t *free_fn, void *pool_data)
......@@ -289,6 +293,8 @@ EXPORT_SYMBOL(mempool_create_node);
* Note, the caller must guarantee that no mempool_destroy is called
* while this function is running. mempool_alloc() & mempool_free()
* might be called (eg. from IRQ contexts) while this function executes.
*
* Return: %0 on success, negative error code otherwise.
*/
int mempool_resize(mempool_t *pool, int new_min_nr)
{
......@@ -363,6 +369,8 @@ EXPORT_SYMBOL(mempool_resize);
* *never* fails when called from process contexts. (it might
* fail if called from an IRQ context.)
* Note: using __GFP_ZERO is not supported.
*
* Return: pointer to the allocated element or %NULL on error.
*/
void *mempool_alloc(mempool_t *pool, gfp_t gfp_mask)
{
......
......@@ -270,7 +270,7 @@ static void wb_min_max_ratio(struct bdi_writeback *wb,
* node_dirtyable_memory - number of dirtyable pages in a node
* @pgdat: the node
*
* Returns the node's number of pages potentially available for dirty
* Return: the node's number of pages potentially available for dirty
* page cache. This is the base value for the per-node dirty limits.
*/
static unsigned long node_dirtyable_memory(struct pglist_data *pgdat)
......@@ -355,7 +355,7 @@ static unsigned long highmem_dirtyable_memory(unsigned long total)
/**
* global_dirtyable_memory - number of globally dirtyable pages
*
* Returns the global number of pages potentially available for dirty
* Return: the global number of pages potentially available for dirty
* page cache. This is the base value for the global dirty limits.
*/
static unsigned long global_dirtyable_memory(void)
......@@ -470,7 +470,7 @@ void global_dirty_limits(unsigned long *pbackground, unsigned long *pdirty)
* node_dirty_limit - maximum number of dirty pages allowed in a node
* @pgdat: the node
*
* Returns the maximum number of dirty pages allowed in a node, based
* Return: the maximum number of dirty pages allowed in a node, based
* on the node's dirtyable memory.
*/
static unsigned long node_dirty_limit(struct pglist_data *pgdat)
......@@ -495,7 +495,7 @@ static unsigned long node_dirty_limit(struct pglist_data *pgdat)
* node_dirty_ok - tells whether a node is within its dirty limits
* @pgdat: the node to check
*
* Returns %true when the dirty pages in @pgdat are within the node's
* Return: %true when the dirty pages in @pgdat are within the node's
* dirty limit, %false if the limit is exceeded.
*/
bool node_dirty_ok(struct pglist_data *pgdat)
......@@ -743,9 +743,6 @@ static void mdtc_calc_avail(struct dirty_throttle_control *mdtc,
* __wb_calc_thresh - @wb's share of dirty throttling threshold
* @dtc: dirty_throttle_context of interest
*
* Returns @wb's dirty limit in pages. The term "dirty" in the context of
* dirty balancing includes all PG_dirty, PG_writeback and NFS unstable pages.
*
* Note that balance_dirty_pages() will only seriously take it as a hard limit
* when sleeping max_pause per page is not enough to keep the dirty pages under
* control. For example, when the device is completely stalled due to some error
......@@ -759,6 +756,9 @@ static void mdtc_calc_avail(struct dirty_throttle_control *mdtc,
*
* The wb's share of dirty limit will be adapting to its throughput and
* bounded by the bdi->min_ratio and/or bdi->max_ratio parameters, if set.
*
* Return: @wb's dirty limit in pages. The term "dirty" in the context of
* dirty balancing includes all PG_dirty, PG_writeback and NFS unstable pages.
*/
static unsigned long __wb_calc_thresh(struct dirty_throttle_control *dtc)
{
......@@ -1918,7 +1918,9 @@ EXPORT_SYMBOL(balance_dirty_pages_ratelimited);
* @wb: bdi_writeback of interest
*
* Determines whether background writeback should keep writing @wb or it's
* clean enough. Returns %true if writeback should continue.
* clean enough.
*
* Return: %true if writeback should continue.
*/
bool wb_over_bg_thresh(struct bdi_writeback *wb)
{
......@@ -2147,6 +2149,8 @@ EXPORT_SYMBOL(tag_pages_for_writeback);
* lock/page writeback access order inversion - we should only ever lock
* multiple pages in ascending page->index order, and looping back to the start
* of the file violates that rule and causes deadlocks.
*
* Return: %0 on success, negative error code otherwise
*/
int write_cache_pages(struct address_space *mapping,
struct writeback_control *wbc, writepage_t writepage,
......@@ -2305,6 +2309,8 @@ static int __writepage(struct page *page, struct writeback_control *wbc,
*
* This is a library function, which implements the writepages()
* address_space_operation.
*
* Return: %0 on success, negative error code otherwise
*/
int generic_writepages(struct address_space *mapping,
struct writeback_control *wbc)
......@@ -2351,6 +2357,8 @@ int do_writepages(struct address_space *mapping, struct writeback_control *wbc)
*
* Note that the mapping's AS_EIO/AS_ENOSPC flags will be cleared when this
* function returns.
*
* Return: %0 on success, negative error code otherwise
*/
int write_one_page(struct page *page)
{
......
......@@ -4816,6 +4816,8 @@ static void *make_alloc_exact(unsigned long addr, unsigned int order,
* This function is also limited by MAX_ORDER.
*
* Memory allocated by this function must be released by free_pages_exact().
*
* Return: pointer to the allocated area or %NULL in case of error.
*/
void *alloc_pages_exact(size_t size, gfp_t gfp_mask)
{
......@@ -4836,6 +4838,8 @@ EXPORT_SYMBOL(alloc_pages_exact);
*
* Like alloc_pages_exact(), but try to allocate on node nid first before falling
* back.
*
* Return: pointer to the allocated area or %NULL in case of error.
*/
void * __meminit alloc_pages_exact_nid(int nid, size_t size, gfp_t gfp_mask)
{
......@@ -4869,11 +4873,13 @@ EXPORT_SYMBOL(free_pages_exact);
* nr_free_zone_pages - count number of pages beyond high watermark
* @offset: The zone index of the highest zone
*
* nr_free_zone_pages() counts the number of counts pages which are beyond the
* nr_free_zone_pages() counts the number of pages which are beyond the
* high watermark within all zones at or below a given zone index. For each
* zone, the number of pages is calculated as:
*
* nr_free_zone_pages = managed_pages - high_pages
*
* Return: number of pages beyond high watermark.
*/
static unsigned long nr_free_zone_pages(int offset)
{
......@@ -4900,6 +4906,9 @@ static unsigned long nr_free_zone_pages(int offset)
*
* nr_free_buffer_pages() counts the number of pages which are beyond the high
* watermark within ZONE_DMA and ZONE_NORMAL.
*
* Return: number of pages beyond high watermark within ZONE_DMA and
* ZONE_NORMAL.
*/
unsigned long nr_free_buffer_pages(void)
{
......@@ -4912,6 +4921,8 @@ EXPORT_SYMBOL_GPL(nr_free_buffer_pages);
*
* nr_free_pagecache_pages() counts the number of pages which are beyond the
* high watermark within all zones.
*
* Return: number of pages beyond high watermark within all zones.
*/
unsigned long nr_free_pagecache_pages(void)
{
......@@ -5358,7 +5369,8 @@ static int node_load[MAX_NUMNODES];
* from each node to each node in the system), and should also prefer nodes
* with no CPUs, since presumably they'll have very little allocation pressure
* on them otherwise.
* It returns -1 if no node is found.
*
* Return: node id of the found node or %NUMA_NO_NODE if no node is found.
*/
static int find_next_best_node(int node, nodemask_t *used_node_mask)
{
......@@ -6269,7 +6281,7 @@ unsigned long __init __absent_pages_in_range(int nid,
* @start_pfn: The start PFN to start searching for holes
* @end_pfn: The end PFN to stop searching for holes
*
* It returns the number of pages frames in memory holes within a range.
* Return: the number of pages frames in memory holes within a range.
*/
unsigned long __init absent_pages_in_range(unsigned long start_pfn,
unsigned long end_pfn)
......@@ -6826,7 +6838,7 @@ void __init setup_nr_node_ids(void)
* model has fine enough granularity to avoid incorrect mapping for the
* populated node map.
*
* Returns the determined alignment in pfn's. 0 if there is no alignment
* Return: the determined alignment in pfn's. 0 if there is no alignment
* requirement (single node).
*/
unsigned long __init node_map_pfn_alignment(void)
......@@ -6881,7 +6893,7 @@ static unsigned long __init find_min_pfn_for_node(int nid)
/**
* find_min_pfn_with_active_regions - Find the minimum PFN registered
*
* It returns the minimum PFN based on information provided via
* Return: the minimum PFN based on information provided via
* memblock_set_node().
*/
unsigned long __init find_min_pfn_with_active_regions(void)
......@@ -8174,7 +8186,7 @@ static int __alloc_contig_migrate_range(struct compact_control *cc,
* pageblocks in the range. Once isolated, the pageblocks should not
* be modified by others.
*
* Returns zero on success or negative error code. On success all
* Return: zero on success or negative error code. On success all
* pages which PFN is in [start, end) are allocated for the caller and
* need to be freed with free_contig_range().
*/
......
......@@ -81,6 +81,8 @@ static void read_cache_pages_invalidate_pages(struct address_space *mapping,
* @data: private data for the callback routine.
*
* Hides the details of the LRU cache etc from the filesystems.
*
* Returns: %0 on success, error return by @filler otherwise
*/
int read_cache_pages(struct address_space *mapping, struct list_head *pages,
int (*filler)(void *, struct page *), void *data)
......
......@@ -1727,6 +1727,8 @@ static void slabs_destroy(struct kmem_cache *cachep, struct list_head *list)
* This could be made much more intelligent. For now, try to avoid using
* high order pages for slabs. When the gfp() functions are more friendly
* towards high-order requests, this should be changed.
*
* Return: number of left-over bytes in a slab
*/
static size_t calculate_slab_order(struct kmem_cache *cachep,
size_t size, slab_flags_t flags)
......@@ -1975,6 +1977,8 @@ static bool set_on_slab_cache(struct kmem_cache *cachep,
* %SLAB_HWCACHE_ALIGN - Align the objects in this cache to a hardware
* cacheline. This can be beneficial if you're counting cycles as closely
* as davem.
*
* Return: a pointer to the created cache or %NULL in case of error
*/
int __kmem_cache_create(struct kmem_cache *cachep, slab_flags_t flags)
{
......@@ -3542,6 +3546,8 @@ void ___cache_free(struct kmem_cache *cachep, void *objp,
*
* Allocate an object from this cache. The flags are only relevant
* if the cache has no available objects.
*
* Return: pointer to the new object or %NULL in case of error
*/
void *kmem_cache_alloc(struct kmem_cache *cachep, gfp_t flags)
{
......@@ -3631,6 +3637,8 @@ EXPORT_SYMBOL(kmem_cache_alloc_trace);
* node, which can improve the performance for cpu bound structures.
*
* Fallback to other node is possible if __GFP_THISNODE is not set.
*
* Return: pointer to the new object or %NULL in case of error
*/
void *kmem_cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid)
{
......@@ -3699,6 +3707,8 @@ EXPORT_SYMBOL(__kmalloc_node_track_caller);
* @size: how many bytes of memory are required.
* @flags: the type of memory to allocate (see kmalloc).
* @caller: function caller for debug tracking of the caller
*
* Return: pointer to the allocated memory or %NULL in case of error
*/
static __always_inline void *__do_kmalloc(size_t size, gfp_t flags,
unsigned long caller)
......@@ -4164,6 +4174,8 @@ void slabinfo_show_stats(struct seq_file *m, struct kmem_cache *cachep)
* @buffer: user buffer
* @count: data length
* @ppos: unused
*
* Return: %0 on success, negative error code otherwise.
*/
ssize_t slabinfo_write(struct file *file, const char __user *buffer,
size_t count, loff_t *ppos)
......@@ -4457,6 +4469,8 @@ void __check_heap_object(const void *ptr, unsigned long n, struct page *page,
* The caller must guarantee that objp points to a valid object previously
* allocated with either kmalloc() or kmem_cache_alloc(). The object
* must not be freed during the duration of the call.
*
* Return: size of the actual memory used by @objp in bytes
*/
size_t ksize(const void *objp)
{
......
......@@ -939,6 +939,8 @@ EXPORT_SYMBOL(kmem_cache_destroy);
*
* Releases as many slabs as possible for a cache.
* To help debugging, a zero exit status indicates all slabs were released.
*
* Return: %0 if all slabs were released, non-zero otherwise
*/
int kmem_cache_shrink(struct kmem_cache *cachep)
{
......@@ -1528,6 +1530,8 @@ static __always_inline void *__do_krealloc(const void *p, size_t new_size,
* This function is like krealloc() except it never frees the originally
* allocated buffer. Use this if you don't want to free the buffer immediately
* like, for example, with RCU.
*
* Return: pointer to the allocated memory or %NULL in case of error
*/
void *__krealloc(const void *p, size_t new_size, gfp_t flags)
{
......@@ -1549,6 +1553,8 @@ EXPORT_SYMBOL(__krealloc);
* lesser of the new and old sizes. If @p is %NULL, krealloc()
* behaves exactly like kmalloc(). If @new_size is 0 and @p is not a
* %NULL pointer, the object pointed to is freed.
*
* Return: pointer to the allocated memory or %NULL in case of error
*/
void *krealloc(const void *p, size_t new_size, gfp_t flags)
{
......
......@@ -539,6 +539,8 @@ EXPORT_SYMBOL(truncate_inode_pages_final);
* invalidate_mapping_pages() will not block on IO activity. It will not
* invalidate pages which are dirty, locked, under writeback or mapped into
* pagetables.
*
* Return: the number of the pages that were invalidated
*/
unsigned long invalidate_mapping_pages(struct address_space *mapping,
pgoff_t start, pgoff_t end)
......@@ -664,7 +666,7 @@ static int do_launder_page(struct address_space *mapping, struct page *page)
* Any pages which are found to be mapped into pagetables are unmapped prior to
* invalidation.
*
* Returns -EBUSY if any pages could not be invalidated.
* Return: -EBUSY if any pages could not be invalidated.
*/
int invalidate_inode_pages2_range(struct address_space *mapping,
pgoff_t start, pgoff_t end)
......@@ -761,7 +763,7 @@ EXPORT_SYMBOL_GPL(invalidate_inode_pages2_range);
* Any pages which are found to be mapped into pagetables are unmapped prior to
* invalidation.
*
* Returns -EBUSY if any pages could not be invalidated.
* Return: -EBUSY if any pages could not be invalidated.
*/
int invalidate_inode_pages2(struct address_space *mapping)
{
......
......@@ -36,6 +36,8 @@ EXPORT_SYMBOL(kfree_const);
* kstrdup - allocate space for and copy an existing string
* @s: the string to duplicate
* @gfp: the GFP mask used in the kmalloc() call when allocating memory
*
* Return: newly allocated copy of @s or %NULL in case of error
*/
char *kstrdup(const char *s, gfp_t gfp)
{
......@@ -58,9 +60,10 @@ EXPORT_SYMBOL(kstrdup);
* @s: the string to duplicate
* @gfp: the GFP mask used in the kmalloc() call when allocating memory
*
* Function returns source string if it is in .rodata section otherwise it
* fallbacks to kstrdup.
* Strings allocated by kstrdup_const should be freed by kfree_const.
* Note: Strings allocated by kstrdup_const should be freed by kfree_const.
*
* Return: source string if it is in .rodata section otherwise
* fallback to kstrdup.
*/
const char *kstrdup_const(const char *s, gfp_t gfp)
{
......@@ -78,6 +81,8 @@ EXPORT_SYMBOL(kstrdup_const);
* @gfp: the GFP mask used in the kmalloc() call when allocating memory
*
* Note: Use kmemdup_nul() instead if the size is known exactly.
*
* Return: newly allocated copy of @s or %NULL in case of error
*/
char *kstrndup(const char *s, size_t max, gfp_t gfp)
{
......@@ -103,6 +108,8 @@ EXPORT_SYMBOL(kstrndup);
* @src: memory region to duplicate
* @len: memory region length
* @gfp: GFP mask to use
*
* Return: newly allocated copy of @src or %NULL in case of error
*/
void *kmemdup(const void *src, size_t len, gfp_t gfp)
{
......@@ -120,6 +127,9 @@ EXPORT_SYMBOL(kmemdup);
* @s: The data to stringify
* @len: The size of the data
* @gfp: the GFP mask used in the kmalloc() call when allocating memory
*
* Return: newly allocated copy of @s with NUL-termination or %NULL in
* case of error
*/
char *kmemdup_nul(const char *s, size_t len, gfp_t gfp)
{
......@@ -143,7 +153,7 @@ EXPORT_SYMBOL(kmemdup_nul);
* @src: source address in user space
* @len: number of bytes to copy
*
* Returns an ERR_PTR() on failure. Result is physically
* Return: an ERR_PTR() on failure. Result is physically
* contiguous, to be freed by kfree().
*/
void *memdup_user(const void __user *src, size_t len)
......@@ -169,7 +179,7 @@ EXPORT_SYMBOL(memdup_user);
* @src: source address in user space
* @len: number of bytes to copy
*
* Returns an ERR_PTR() on failure. Result may be not
* Return: an ERR_PTR() on failure. Result may be not
* physically contiguous. Use kvfree() to free.
*/
void *vmemdup_user(const void __user *src, size_t len)
......@@ -193,6 +203,8 @@ EXPORT_SYMBOL(vmemdup_user);
* strndup_user - duplicate an existing string from user space
* @s: The string to duplicate
* @n: Maximum number of bytes to copy, including the trailing NUL.
*
* Return: newly allocated copy of @s or %NULL in case of error
*/
char *strndup_user(const char __user *s, long n)
{
......@@ -224,7 +236,7 @@ EXPORT_SYMBOL(strndup_user);
* @src: source address in user space
* @len: number of bytes to copy
*
* Returns an ERR_PTR() on failure.
* Return: an ERR_PTR() on failure.
*/
void *memdup_user_nul(const void __user *src, size_t len)
{
......@@ -310,10 +322,6 @@ EXPORT_SYMBOL_GPL(__get_user_pages_fast);
* @pages: array that receives pointers to the pages pinned.
* Should be at least nr_pages long.
*
* Returns number of pages pinned. This may be fewer than the number
* requested. If nr_pages is 0 or negative, returns 0. If no pages
* were pinned, returns -errno.
*
* get_user_pages_fast provides equivalent functionality to get_user_pages,
* operating on current and current->mm, with force=0 and vma=NULL. However
* unlike get_user_pages, it must be called without mmap_sem held.
......@@ -325,6 +333,10 @@ EXPORT_SYMBOL_GPL(__get_user_pages_fast);
* pages have to be faulted in, it may turn out to be slightly slower so
* callers need to carefully consider what to use. On many architectures,
* get_user_pages_fast simply falls back to get_user_pages.
*
* Return: number of pages pinned. This may be fewer than the number
* requested. If nr_pages is 0 or negative, returns 0. If no pages
* were pinned, returns -errno.
*/
int __weak get_user_pages_fast(unsigned long start,
int nr_pages, int write, struct page **pages)
......@@ -386,6 +398,8 @@ EXPORT_SYMBOL(vm_mmap);
*
* Please note that any use of gfp flags outside of GFP_KERNEL is careful to not
* fall back to vmalloc.
*
* Return: pointer to the allocated memory of %NULL in case of failure
*/
void *kvmalloc_node(size_t size, gfp_t flags, int node)
{
......@@ -729,7 +743,8 @@ int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin)
* @buffer: the buffer to copy to.
* @buflen: the length of the buffer. Larger cmdline values are truncated
* to this length.
* Returns the size of the cmdline field copied. Note that the copy does
*
* Return: the size of the cmdline field copied. Note that the copy does
* not guarantee an ending NULL byte.
*/
int get_cmdline(struct task_struct *task, char *buffer, int buflen)
......
......@@ -844,7 +844,7 @@ static void *vmap_block_vaddr(unsigned long va_start, unsigned long pages_off)
* @order: how many 2^order pages should be occupied in newly allocated block
* @gfp_mask: flags for the page level allocator
*
* Returns: virtual address in a newly allocated block or ERR_PTR(-errno)
* Return: virtual address in a newly allocated block or ERR_PTR(-errno)
*/
static void *new_vmap_block(unsigned int order, gfp_t gfp_mask)
{
......@@ -1433,6 +1433,8 @@ struct vm_struct *__get_vm_area_caller(unsigned long size, unsigned long flags,
* Search an area of @size in the kernel virtual mapping area,
* and reserved it for out purposes. Returns the area descriptor
* on success or %NULL on failure.
*
* Return: the area descriptor on success or %NULL on failure.
*/
struct vm_struct *get_vm_area(unsigned long size, unsigned long flags)
{
......@@ -1455,6 +1457,8 @@ struct vm_struct *get_vm_area_caller(unsigned long size, unsigned long flags,
* Search for the kernel VM area starting at @addr, and return it.
* It is up to the caller to do all required locking to keep the returned
* pointer valid.
*
* Return: pointer to the found area or %NULL on faulure
*/
struct vm_struct *find_vm_area(const void *addr)
{
......@@ -1474,6 +1478,8 @@ struct vm_struct *find_vm_area(const void *addr)
* Search for the kernel VM area starting at @addr, and remove it.
* This function returns the found VM area, but using it is NOT safe
* on SMP machines, except for its size or flags.
*
* Return: pointer to the found area or %NULL on faulure
*/
struct vm_struct *remove_vm_area(const void *addr)
{
......@@ -1636,6 +1642,8 @@ EXPORT_SYMBOL(vunmap);
*
* Maps @count pages from @pages into contiguous kernel virtual
* space.
*
* Return: the address of the area or %NULL on failure
*/
void *vmap(struct page **pages, unsigned int count,
unsigned long flags, pgprot_t prot)
......@@ -1739,6 +1747,8 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
* Allocate enough pages to cover @size from the page level
* allocator with @gfp_mask flags. Map them into contiguous
* kernel virtual space, using a pagetable protection of @prot.
*
* Return: the address of the area or %NULL on failure
*/
void *__vmalloc_node_range(unsigned long size, unsigned long align,
unsigned long start, unsigned long end, gfp_t gfp_mask,
......@@ -1806,6 +1816,8 @@ EXPORT_SYMBOL_GPL(__vmalloc_node_range);
*
* Any use of gfp flags outside of GFP_KERNEL should be consulted
* with mm people.
*
* Return: pointer to the allocated memory or %NULL on error
*/
static void *__vmalloc_node(unsigned long size, unsigned long align,
gfp_t gfp_mask, pgprot_t prot,
......@@ -1845,6 +1857,8 @@ void *__vmalloc_node_flags_caller(unsigned long size, int node, gfp_t flags,
*
* For tight control over page level allocator and protection flags
* use __vmalloc() instead.
*
* Return: pointer to the allocated memory or %NULL on error
*/
void *vmalloc(unsigned long size)
{
......@@ -1863,6 +1877,8 @@ EXPORT_SYMBOL(vmalloc);
*
* For tight control over page level allocator and protection flags
* use __vmalloc() instead.
*
* Return: pointer to the allocated memory or %NULL on error
*/
void *vzalloc(unsigned long size)
{
......@@ -1877,6 +1893,8 @@ EXPORT_SYMBOL(vzalloc);
*
* The resulting memory area is zeroed so it can be mapped to userspace
* without leaking data.
*
* Return: pointer to the allocated memory or %NULL on error
*/
void *vmalloc_user(unsigned long size)
{
......@@ -1897,6 +1915,8 @@ EXPORT_SYMBOL(vmalloc_user);
*
* For tight control over page level allocator and protection flags
* use __vmalloc() instead.
*
* Return: pointer to the allocated memory or %NULL on error
*/
void *vmalloc_node(unsigned long size, int node)
{
......@@ -1916,6 +1936,8 @@ EXPORT_SYMBOL(vmalloc_node);
*
* For tight control over page level allocator and protection flags
* use __vmalloc_node() instead.
*
* Return: pointer to the allocated memory or %NULL on error
*/
void *vzalloc_node(unsigned long size, int node)
{
......@@ -1934,6 +1956,8 @@ EXPORT_SYMBOL(vzalloc_node);
*
* For tight control over page level allocator and protection flags
* use __vmalloc() instead.
*
* Return: pointer to the allocated memory or %NULL on error
*/
void *vmalloc_exec(unsigned long size)
{
......@@ -1959,6 +1983,8 @@ void *vmalloc_exec(unsigned long size)
*
* Allocate enough 32bit PA addressable pages to cover @size from the
* page level allocator and map them into contiguous kernel virtual space.
*
* Return: pointer to the allocated memory or %NULL on error
*/
void *vmalloc_32(unsigned long size)
{
......@@ -1973,6 +1999,8 @@ EXPORT_SYMBOL(vmalloc_32);
*
* The resulting memory area is 32bit addressable and zeroed so it can be
* mapped to userspace without leaking data.
*
* Return: pointer to the allocated memory or %NULL on error
*/
void *vmalloc_32_user(unsigned long size)
{
......@@ -2070,10 +2098,6 @@ static int aligned_vwrite(char *buf, char *addr, unsigned long count)
* @addr: vm address.
* @count: number of bytes to be read.
*
* Returns # of bytes which addr and buf should be increased.
* (same number to @count). Returns 0 if [addr...addr+count) doesn't
* includes any intersect with alive vmalloc area.
*
* This function checks that addr is a valid vmalloc'ed area, and
* copy data from that area to a given buffer. If the given memory range
* of [addr...addr+count) includes some valid address, data is copied to
......@@ -2087,6 +2111,10 @@ static int aligned_vwrite(char *buf, char *addr, unsigned long count)
* should know vmalloc() area is valid and can use memcpy().
* This is for routines which have to access vmalloc area without
* any informaion, as /dev/kmem.
*
* Return: number of bytes for which addr and buf should be increased
* (same number as @count) or %0 if [addr...addr+count) doesn't
* include any intersection with valid vmalloc area
*/
long vread(char *buf, char *addr, unsigned long count)
{
......@@ -2149,11 +2177,6 @@ long vread(char *buf, char *addr, unsigned long count)
* @addr: vm address.
* @count: number of bytes to be read.
*
* Returns # of bytes which addr and buf should be incresed.
* (same number to @count).
* If [addr...addr+count) doesn't includes any intersect with valid
* vmalloc area, returns 0.
*
* This function checks that addr is a valid vmalloc'ed area, and
* copy data from a buffer to the given addr. If specified range of
* [addr...addr+count) includes some valid address, data is copied from
......@@ -2167,6 +2190,10 @@ long vread(char *buf, char *addr, unsigned long count)
* should know vmalloc() area is valid and can use memcpy().
* This is for routines which have to access vmalloc area without
* any informaion, as /dev/kmem.
*
* Return: number of bytes for which addr and buf should be
* increased (same number as @count) or %0 if [addr...addr+count)
* doesn't include any intersection with valid vmalloc area
*/
long vwrite(char *buf, char *addr, unsigned long count)
{
......
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