static void cache_op_range()

in mm/cachev1.c [43:78]

• 31 lines of code
• 8 McCabe index (conditional complexity)

static void cache_op_range(
	unsigned int start,
	unsigned int end,
	unsigned int value,
	unsigned int l2)
{
	unsigned long i, flags;
	unsigned int val = value | CACHE_CLR | CACHE_OMS;
	bool l2_sync;

	if (unlikely((end - start) >= PAGE_SIZE) ||
	    unlikely(start < PAGE_OFFSET) ||
	    unlikely(start >= PAGE_OFFSET + LOWMEM_LIMIT)) {
		cache_op_all(value, l2);
		return;
	}

	if ((mfcr_ccr2() & CCR2_L2E) && l2)
		l2_sync = 1;
	else
		l2_sync = 0;

	spin_lock_irqsave(&cache_lock, flags);

	i = start & ~(L1_CACHE_BYTES - 1);
	for (; i < end; i += L1_CACHE_BYTES) {
		cache_op_line(i, val);
		if (l2_sync) {
			mb();
			mtcr("cr24", val);
		}
	}
	spin_unlock_irqrestore(&cache_lock, flags);

	mb();
}