diff options
Diffstat (limited to 'mm/vmalloc.c')
| -rw-r--r-- | mm/vmalloc.c | 47 |
1 files changed, 37 insertions, 10 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 03cbba890301..e86ba6e74b50 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -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 @@ fail: * 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 @@ finished: * @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 @@ finished: * 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) { |