kfree – free previously allocated memory Synopsis void kfree(const void *objp); Arguments objp pointer returned by kmalloc. Description If objp is NULL, no operation is performed. Don’t free memory not originally allocated by kmalloc or you will run into trouble. Copyright
kfifo_to_user – copies data from the fifo into user space Synopsis kfifo_to_user(fifo, to, len, copied); Arguments fifo address of the fifo to be used to where the data must be copied len the size of the destination buffer copied pointer to output variable to store the number of copied bytes Description This macro copies at…
kfifo_skip – skip output data Synopsis kfifo_skip(fifo); Arguments fifo address of the fifo to be used Copyright
kfifo_size – returns the size of the fifo in elements Synopsis kfifo_size(fifo); Arguments fifo address of the fifo to be used Copyright
kfifo_reset_out – skip fifo content Synopsis kfifo_reset_out(fifo); Arguments fifo address of the fifo to be used Note The usage of kfifo_reset_out is safe until it will be only called from the reader thread and there is only one concurrent reader. Otherwise it is dangerous and must be handled in the same way as kfifo_reset. Copyright
kfifo_reset – removes the entire fifo content Synopsis kfifo_reset(fifo); Arguments fifo address of the fifo to be used Note usage of kfifo_reset is dangerous. It should be only called when the fifo is exclusived locked or when it is secured that no other thread is accessing the fifo. Copyright
kfifo_recsize – returns the size of the record length field Synopsis kfifo_recsize(fifo); Arguments fifo address of the fifo to be used Copyright
kfifo_put – put data into the fifo Synopsis kfifo_put(fifo, val); Arguments fifo address of the fifo to be used val the data to be added Description This macro copies the given value into the fifo. It returns 0 if the fifo was full. Otherwise it returns the number processed elements. Note that with only one…
kfifo_peek_len – gets the size of the next fifo record Synopsis kfifo_peek_len(fifo); Arguments fifo address of the fifo to be used Description This function returns the size of the next fifo record in number of bytes. Copyright
kfifo_peek – get data from the fifo without removing Synopsis kfifo_peek(fifo, val); Arguments fifo address of the fifo to be used val address where to store the data Description This reads the data from the fifo without removing it from the fifo. It returns 0 if the fifo was empty. Otherwise it returns the number…
kfifo_out_spinlocked – get data from the fifo using a spinlock for locking Synopsis kfifo_out_spinlocked(fifo, buf, n, lock); Arguments fifo address of the fifo to be used buf pointer to the storage buffer n max. number of elements to get lock pointer to the spinlock to use for locking Description This macro get the data from…
kfifo_out_peek – gets some data from the fifo Synopsis kfifo_out_peek(fifo, buf, n); Arguments fifo address of the fifo to be used buf pointer to the storage buffer n max. number of elements to get Description This macro get the data from the fifo and return the numbers of elements copied. The data is not removed…
kfifo_out – get data from the fifo Synopsis kfifo_out(fifo, buf, n); Arguments fifo address of the fifo to be used buf pointer to the storage buffer n max. number of elements to get Description This macro get some data from the fifo and return the numbers of elements copied. Note that with only one concurrent…
kfifo_len – returns the number of used elements in the fifo Synopsis kfifo_len(fifo); Arguments fifo address of the fifo to be used Copyright
kfifo_is_full – returns true if the fifo is full Synopsis kfifo_is_full(fifo); Arguments fifo address of the fifo to be used Copyright
kfifo_is_empty – returns true if the fifo is empty Synopsis kfifo_is_empty(fifo); Arguments fifo address of the fifo to be used Copyright
kfifo_initialized – Check if the fifo is initialized Synopsis kfifo_initialized(fifo); Arguments fifo address of the fifo to check Description Return true if fifo is initialized, otherwise false. Assumes the fifo was 0 before. Copyright
kfifo_init – initialize a fifo using a preallocated buffer Synopsis kfifo_init(fifo, buffer, size); Arguments fifo the fifo to assign the buffer buffer the preallocated buffer to be used size the size of the internal buffer, this have to be a power of 2 Description This macro initialize a fifo using a preallocated buffer. The numer…
kfifo_in_spinlocked – put data into the fifo using a spinlock for locking Synopsis kfifo_in_spinlocked(fifo, buf, n, lock); Arguments fifo address of the fifo to be used buf the data to be added n number of elements to be added lock pointer to the spinlock to use for locking Description This macro copies the given values…
kfifo_in – put data into the fifo Synopsis kfifo_in(fifo, buf, n); Arguments fifo address of the fifo to be used buf the data to be added n number of elements to be added Description This macro copies the given buffer into the fifo and returns the number of copied elements. Note that with only one…