static int ftrace_modify_code()

in kernel/ftrace.c [72:97]

• 22 lines of code
• 2 McCabe index (conditional complexity)

static int ftrace_modify_code(unsigned long addr, unsigned int value)
{
	int faulted = 0;

	__asm__ __volatile__("	1:	swi	%2, %1, 0;"		\
				"	addik	%0, r0, 0;"		\
				"2:"					\
				"	.section .fixup, \"ax\";"	\
				"3:	brid	2b;"			\
				"	addik	%0, r0, 1;"		\
				"	.previous;"			\
				"	.section __ex_table,\"a\";"	\
				"	.word	1b,3b;"			\
				"	.previous;"			\
				: "=r" (faulted)
				: "r" (addr), "r" (value)
	);

	if (unlikely(faulted))
		return -EFAULT;

	flush_dcache_range(addr, addr + 4);
	flush_icache_range(addr, addr + 4);

	return 0;
}