x86/mm: Replace nodes_weight() with nodes_empty() where appropriate

Various mm code calls nodes_weight() to check if any bit of a given
nodemask is set.

This can be done more efficiently with nodes_empty() because nodes_empty()
stops traversing the nodemask as soon as it finds first set bit, while
nodes_weight() counts all bits unconditionally.

Signed-off-by: Yury Norov <[e-mail]>
Signed-off-by: Thomas Gleixner <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

arch/x86/mm/amdtopology.c

···
 		node_set(nodeid, numa_nodes_parsed);
 	}
 
-	if (!nodes_weight(numa_nodes_parsed))
+	if (nodes_empty(numa_nodes_parsed))
 		return -ENOENT;
 
 	/*

arch/x86/mm/numa_emulation.c

···
 	 * Continue to fill physical nodes with fake nodes until there is no
 	 * memory left on any of them.
 	 */
-	while (nodes_weight(physnode_mask)) {
+	while (!nodes_empty(physnode_mask)) {
 		for_each_node_mask(i, physnode_mask) {
 			u64 dma32_end = PFN_PHYS(MAX_DMA32_PFN);
 			u64 start, limit, end;
···
 	 * Fill physical nodes with fake nodes of size until there is no memory
 	 * left on any of them.
 	 */
-	while (nodes_weight(physnode_mask)) {
+	while (!nodes_empty(physnode_mask)) {
 		for_each_node_mask(i, physnode_mask) {
 			u64 dma32_end = PFN_PHYS(MAX_DMA32_PFN);
 			u64 start, limit, end;