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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: Uladzislau Rezki (Sony) <urezki@gmail.com>
Cc: Christop Hellwig <hch@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
pull/1253/head
Uladzislau Rezki (Sony) 2025-04-08 17:15:49 +02:00 committed by Andrew Morton
parent ce906d7679
commit 24c76f37ab
1 changed files with 15 additions and 4 deletions
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19
mm/vmalloc.c
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@ -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);