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Kernel: Port VMObject to ListedRefCounted

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The VMObject class now manages its own instance list (it was previously
a member of MemoryManager.) Removal from the list is done safely on the
last unref(), closing a race window in the previous implementation.

Note that VMObject::all_instances() now has its own lock instead of
using the global MM lock.
This commit is contained in:
Andreas Kling 2021-08-16 22:54:25 +02:00
parent 3a2d888913
commit 7979b5a8bb
4 changed files with 26 additions and 28 deletions
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12
Kernel/Memory/MemoryManager.cpp
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@ -1053,18 +1053,6 @@ bool MemoryManager::validate_user_stack(AddressSpace& space, VirtualAddress vadd
return validate_user_stack_no_lock(space, vaddr);
}
void MemoryManager::register_vmobject(VMObject& vmobject)
{
ScopedSpinLock lock(s_mm_lock);
m_vmobjects.append(vmobject);
}
void MemoryManager::unregister_vmobject(VMObject& vmobject)
{
ScopedSpinLock lock(s_mm_lock);
m_vmobjects.remove(vmobject);
}
void MemoryManager::register_region(Region& region)
{
ScopedSpinLock lock(s_mm_lock);