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mm/vmalloc: extract vmap_insert_free_area helper

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The allocation and insertion of a free vmap_area is duplicated between the
loop body and the tail of vmap_init_free_space.  Factor it into a small
helper so the main function only deals with computing the free gaps
between busy regions.

Link: https://lore.kernel.org/20260915-vmalloc_study-v2-2-cc4dfe635e22@linux.dev
Signed-off-by: Ye Liu <liuye@kylinos.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Reviewed-by: Dev Jain <dev.jain@arm.com>
This commit is contained in:
Ye Liu 2026-09-15 10:43:31 +08:00 committed by Andrew Morton
parent ebb07f8a8b
commit c10ed0f231
1 changed files with 18 additions and 23 deletions
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41
mm/vmalloc.c
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@ -5419,11 +5419,23 @@ module_init(proc_vmalloc_init);
#endif
static void __init vmap_insert_free_area(unsigned long start, unsigned long end)
{
struct vmap_area *free = kmem_cache_zalloc(vmap_area_cachep, GFP_NOWAIT);
if (!WARN_ON_ONCE(!free)) {
free->va_start = start;
free->va_end = end;
insert_vmap_area_augment(free, NULL,
&free_vmap_area_root,
&free_vmap_area_list);
}
}
static void __init vmap_init_free_space(void)
{
unsigned long vmap_start = 1;
const unsigned long vmap_end = ULONG_MAX;
struct vmap_area *free;
struct vm_struct *busy;
/*
@ -5433,32 +5445,15 @@ static void __init vmap_init_free_space(void)
* |<--------------------------------->|
*/
for (busy = vmlist; busy; busy = busy->next) {
if ((unsigned long) busy->addr - vmap_start > 0) {
free = kmem_cache_zalloc(vmap_area_cachep, GFP_NOWAIT);
if (!WARN_ON_ONCE(!free)) {
free->va_start = vmap_start;
free->va_end = (unsigned long) busy->addr;
insert_vmap_area_augment(free, NULL,
&free_vmap_area_root,
&free_vmap_area_list);
}
}
if ((unsigned long) busy->addr - vmap_start > 0)
vmap_insert_free_area(vmap_start,
(unsigned long) busy->addr);
vmap_start = (unsigned long) busy->addr + busy->size;
}
if (vmap_end - vmap_start > 0) {
free = kmem_cache_zalloc(vmap_area_cachep, GFP_NOWAIT);
if (!WARN_ON_ONCE(!free)) {
free->va_start = vmap_start;
free->va_end = vmap_end;
insert_vmap_area_augment(free, NULL,
&free_vmap_area_root,
&free_vmap_area_list);
}
}
if (vmap_end - vmap_start > 0)
vmap_insert_free_area(vmap_start, vmap_end);
}
static void vmap_init_nodes(void)