Commit 24c76f37 authored by Uladzislau Rezki (Sony)'s avatar Uladzislau Rezki (Sony) Committed by Andrew Morton
Browse files

vmalloc: use for_each_vmap_node() in purge-vmap-area 

Update a __purge_vmap_area_lazy() to use introduced helper.  This is last
place in vmalloc code.  Also this patch introduces an extra function which
is node_to_id() that converts a vmap_node pointer to an index in array.

__purge_vmap_area_lazy() requires that extra function.

Link: https://lkml.kernel.org/r/20250408151549.77937-3-urezki@gmail.com


Signed-off-by: default avatarUladzislau Rezki (Sony) <urezki@gmail.com>
Cc: Christop Hellwig <hch@infradead.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent ce906d76

mm/vmalloc.c

+15 −4
Original line number Diff line number Diff line
@@ -923,6 +923,19 @@ id_to_node(unsigned int id) 
	return &vmap_nodes[id % nr_vmap_nodes];

}



static inline unsigned int

node_to_id(struct vmap_node *node)

{

	/* Pointer arithmetic. */

	unsigned int id = node - vmap_nodes;



	if (likely(id < nr_vmap_nodes))

		return id;



	WARN_ONCE(1, "An address 0x%p is out-of-bounds.\n", node);

	return 0;

}



/*

 * We use the value 0 to represent "no node", that is why

 * an encoded value will be the node-id incremented by 1.
@@ -2259,9 +2272,7 @@ static bool __purge_vmap_area_lazy(unsigned long start, unsigned long end, 
	 */

	purge_nodes = CPU_MASK_NONE;



	for (i = 0; i < nr_vmap_nodes; i++) {

		vn = &vmap_nodes[i];



	for_each_vmap_node(vn) {

		INIT_LIST_HEAD(&vn->purge_list);

		vn->skip_populate = full_pool_decay;

		decay_va_pool_node(vn, full_pool_decay);
@@ -2280,7 +2291,7 @@ static bool __purge_vmap_area_lazy(unsigned long start, unsigned long end, 
		end = max(end, list_last_entry(&vn->purge_list,

			struct vmap_area, list)->va_end);



		cpumask_set_cpu(i, &purge_nodes);

		cpumask_set_cpu(node_to_id(vn), &purge_nodes);

	}



	nr_purge_nodes = cpumask_weight(&purge_nodes);