modecpy – Prepare response for MODE SENSE Synopsis void modecpy(u8 *dest, const u8 *src, int n, bool changeable); Arguments dest output buffer src data being copied n length of mode page changeable whether changeable parameters are requested Description Generate a generic MODE SENSE page for either current or changeable parameters. LOCKING: None. Author Jeff Garzik…
misc_register – register a miscellaneous device Synopsis int misc_register(struct miscdevice *misc); Arguments misc device structure Description Register a miscellaneous device with the kernel. If the minor number is set to MISC_DYNAMIC_MINOR a minor number is assigned and placed in the minor field of the structure. For other cases the minor number requested is used. The…
misc_deregister – unregister a miscellaneous device Synopsis void misc_deregister(struct miscdevice *misc); Arguments misc device to unregister Description Unregister a miscellaneous device that was previously successfully registered with misc_register. Copyright
memzero_explicit – Fill a region of memory (e.g. sensitive keying data) with 0s. Synopsis void memzero_explicit(void *s, size_t count); Arguments s Pointer to the start of the area. count The size of the area. Note usually using memset is just fine (!), but in cases where clearing out _local_ data at the end of a…
memset – Fill a region of memory with the given value Synopsis void *memset(void *s, int c, size_t count); Arguments s Pointer to the start of the area. c The byte to fill the area with count The size of the area. Description Do not use memset to access IO space, use memset_io instead. Copyright
memscan – Find a character in an area of memory. Synopsis void *memscan(void *addr, int c, size_t size); Arguments addr The memory area c The byte to search for size The size of the area. Description returns the address of the first occurrence of c, or 1 byte past the area if c is not…
mempool_resize – resize an existing memory pool Synopsis int mempool_resize(mempool_t *pool, int new_min_nr); Arguments pool pointer to the memory pool which was allocated via mempool_create. new_min_nr the new minimum number of elements guaranteed to be allocated for this pool. Description This function shrinks/grows the pool. In the case of growing, it cannot be guaranteed that…
mempool_free – return an element to the pool. Synopsis void mempool_free(void *element, mempool_t *pool); Arguments element pool element pointer. pool pointer to the memory pool which was allocated via mempool_create. Description this function only sleeps if the free_fn function sleeps. Copyright
mempool_destroy – deallocate a memory pool Synopsis void mempool_destroy(mempool_t *pool); Arguments pool pointer to the memory pool which was allocated via mempool_create. Description Free all reserved elements in pool and pool itself. This function only sleeps if the free_fn function sleeps. Copyright
mempool_create – create a memory pool Synopsis mempool_t * mempool_create(int min_nr, mempool_alloc_t * alloc_fn, mempool_free_t * free_fn, void * pool_data); Arguments min_nr the minimum number of elements guaranteed to be allocated for this pool. alloc_fn user-defined element-allocation function. free_fn user-defined element-freeing function. pool_data optional private data available to the user-defined functions. Description this function creates and allocates a guaranteed size, preallocated memory…
mempool_alloc – allocate an element from a specific memory pool Synopsis void *mempool_alloc(mempool_t *pool, gfp_t gfp_mask); Arguments pool pointer to the memory pool which was allocated via mempool_create. gfp_mask the usual allocation bitmask. Description this function only sleeps if the alloc_fn function sleeps or returns NULL. Note that due to preallocation, this function *never* fails…
memparse – parse a string with mem suffixes into a number Synopsis unsigned long long memparse(const char *ptr, char **retptr); Arguments ptr Where parse begins retptr (output) Optional pointer to next char after parse completes Description Parses a string into a number. The number stored at ptr is potentially suffixed with K, M, G, T,…
memmove – Copy one area of memory to another Synopsis void *memmove(void *dest, const void *src, size_t count); Arguments dest Where to copy to src Where to copy from count The size of the area. Description Unlike memcpy, memmove copes with overlapping areas. Copyright
memdup_user_nul – duplicate memory region from user space and NUL-terminate Synopsis void *memdup_user_nul(const void __user *src, size_t len); Arguments src source address in user space len number of bytes to copy Description Returns an ERR_PTR on failure. Copyright
memdup_user – duplicate memory region from user space Synopsis void *memdup_user(const void __user *src, size_t len); Arguments src source address in user space len number of bytes to copy Description Returns an ERR_PTR on failure. Copyright
memcpy – Copy one area of memory to another Synopsis void *memcpy(void *dest, const void *src, size_t count); Arguments dest Where to copy to src Where to copy from count The size of the area. Description You should not use this function to access IO space, use memcpy_toio or memcpy_fromio instead. Copyright
memcmp – Compare two areas of memory Synopsis __visible int memcmp(const void * cs, const void * ct, size_t count); Arguments cs One area of memory ct Another area of memory count The size of the area. Copyright
memchr_inv – Find an unmatching character in an area of memory. Synopsis void *memchr_inv(const void *start, int c, size_t bytes); Arguments start The memory area c Find a character other than c bytes The size of the area. Description returns the address of the first character other than c, or NULL if the whole buffer…
memchr – Find a character in an area of memory. Synopsis void *memchr(const void *s, int c, size_t n); Arguments s The memory area c The byte to search for n The size of the area. Description returns the address of the first occurrence of c, or NULL if c is not found Copyright
mdiobus_write_nested – Nested version of the mdiobus_write function Synopsis int mdiobus_write_nested(struct mii_bus *bus, int addr, u32 regnum, u16 val); Arguments bus the mii_bus struct addr the phy address regnum register number to write val value to write to regnum Description In case of nested MDIO bus access avoid lockdep false positives by using mutex_lock_nested. Note…