Kernel: Reduce the number of TLB invalidations

Invalidations are not done if mapping or unmapping previously unmapped
page. TLB invalidate IPIs are now ignored if they don't affect the
currently mapped address space

kernel/kernel/Processor.cpp

@@ -370,6 +370,8 @@ namespace Kernel
 			switch (message->type)
 			{
 				case SMPMessage::Type::FlushTLB:
+					if (message->flush_tlb.page_table && message->flush_tlb.page_table != processor.m_current_page_table)
+						break;
 					for (size_t i = 0; i < message->flush_tlb.page_count; i++)
 						asm volatile("invlpg (%0)" :: "r"(message->flush_tlb.vaddr + i * PAGE_SIZE) : "memory");
 					break;