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mm: rcu safe VMA freeing

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This prepares for page faults handling under VMA lock, looking up VMAs
under protection of an rcu read lock, instead of the usual mmap read lock.

Link: https://lkml.kernel.org/r/20230227173632.3292573-11-surenb@google.com
Signed-off-by: Michel Lespinasse <michel@lespinasse.org>
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Michel Lespinasse
2023-02-27 09:36:09 -08:00
committed by Andrew Morton
parent 0b6cc04f3d
commit 20cce633f4
2 changed files with 29 additions and 4 deletions
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20
kernel/fork.c
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@@ -479,12 +479,30 @@ struct vm_area_struct *vm_area_dup(struct vm_area_struct *orig)
return new;
}
void vm_area_free(struct vm_area_struct *vma)
static void __vm_area_free(struct vm_area_struct *vma)
{
free_anon_vma_name(vma);
kmem_cache_free(vm_area_cachep, vma);
}
#ifdef CONFIG_PER_VMA_LOCK
static void vm_area_free_rcu_cb(struct rcu_head *head)
{
struct vm_area_struct *vma = container_of(head, struct vm_area_struct,
vm_rcu);
__vm_area_free(vma);
}
#endif
void vm_area_free(struct vm_area_struct *vma)
{
#ifdef CONFIG_PER_VMA_LOCK
call_rcu(&vma->vm_rcu, vm_area_free_rcu_cb);
#else
__vm_area_free(vma);
#endif
}
static void account_kernel_stack(struct task_struct *tsk, int account)
{
if (IS_ENABLED(CONFIG_VMAP_STACK)) {