static inline unsigned long __xchg()

in include/asm/cmpxchg.h [22:39]

• 15 lines of code
• 3 McCabe index (conditional complexity)

static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
				   int size)
{
	unsigned long retval;

	/*  Can't seem to use printk or panic here, so just stop  */
	if (size != 4) do { asm volatile("brkpt;\n"); } while (1);

	__asm__ __volatile__ (
	"1:	%0 = memw_locked(%1);\n"    /*  load into retval */
	"	memw_locked(%1,P0) = %2;\n" /*  store into memory */
	"	if (!P0) jump 1b;\n"
	: "=&r" (retval)
	: "r" (ptr), "r" (x)
	: "memory", "p0"
	);
	return retval;
}