Linux Manuals

kmalloc_array – allocate memory for an array. Synopsis void *kmalloc_array(size_t n, size_t size, gfp_t flags); Arguments n number of elements. size element size. flags the type of memory to allocate (see kmalloc). Copyright

kmalloc – allocate memory Synopsis void *kmalloc(size_t size, gfp_t flags); Arguments size how many bytes of memory are required. flags the type of memory to allocate. Description kmalloc is the normal method of allocating memory for objects smaller than page size in the kernel. The flags argument may be one of: GFP_USER – Allocate memory…

kgdb_skipexception – (optional) exit kgdb_handle_exception early Synopsis int kgdb_skipexception(int exception, struct pt_regs *regs); Arguments exception Exception vector number regs Current struct pt_regs. Description On some architectures it is required to skip a breakpoint exception when it occurs after a breakpoint has been removed. This can be implemented in the architecture specific portion of kgdb. Author…

kgdb_roundup_cpus – Get other CPUs into a holding pattern Synopsis void kgdb_roundup_cpus(unsigned long flags); Arguments flags Current IRQ state Description On SMP systems, we need to get the attention of the other CPUs and get them into a known state. This should do what is needed to get the other CPUs to call kgdb_wait. Note…

kgdb_breakpoint – compiled in breakpoint Synopsis void kgdb_breakpoint(void); Arguments void no arguments Description This will be implemented as a static inline per architecture. This function is called by the kgdb core to execute an architecture specific trap to cause kgdb to enter the exception processing. Author Jason Wessel <jason.wessel [at] windriver.com> Author. Copyright

kgdb_arch_set_pc – Generic call back to the program counter Synopsis void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long pc); Arguments regs Current struct pt_regs. pc The new value for the program counter Description This function handles updating the program counter and requires an architecture specific implementation. Author Jason Wessel <jason.wessel [at] windriver.com> Author. Copyright

kgdb_arch_late – Perform any architecture specific initalization. Synopsis void kgdb_arch_late(void); Arguments void no arguments Description This function will handle the late initalization of any architecture specific callbacks. This is an optional function for handling things like late initialization of hw breakpoints. The default implementation does nothing. Author Jason Wessel <jason.wessel [at] windriver.com> Author. Copyright

kgdb_arch_init – Perform any architecture specific initalization. Synopsis int kgdb_arch_init(void); Arguments void no arguments Description This function will handle the initalization of any architecture specific callbacks. Author Jason Wessel <jason.wessel [at] windriver.com> Author. Copyright

kgdb_arch_handle_exception – Handle architecture specific GDB packets. Synopsis int kgdb_arch_handle_exception(int vector, int signo, int err_code, char *remcom_in_buffer, char *remcom_out_buffer, struct pt_regs *regs); Arguments vector The error vector of the exception that happened. signo The signal number of the exception that happened. err_code The error code of the exception that happened. remcom_in_buffer The buffer of the…

kgdb_arch_exit – Perform any architecture specific uninitalization. Synopsis void kgdb_arch_exit(void); Arguments void no arguments Description This function will handle the uninitalization of any architecture specific callbacks, for dynamic registration and unregistration. Author Jason Wessel <jason.wessel [at] windriver.com> Author. Copyright

kfree_skb – free an sk_buff Synopsis void kfree_skb(struct sk_buff *skb); Arguments skb buffer to free Description Drop a reference to the buffer and free it if the usage count has hit zero. Copyright

kfree_const – conditionally free memory Synopsis void kfree_const(const void *x); Arguments x pointer to the memory Description Function calls kfree only if x is not in .rodata section. Copyright

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…