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Kernel: Use RefPtr instead of LockRefPtr for PhysicalPage

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I believe this to be safe, as the main thing that LockRefPtr provides
over RefPtr is safe copying from a shared LockRefPtr instance. I've
inspected the uses of RefPtr<PhysicalPage> and it seems they're all
guarded by external locking. Some of it is less obvious, but this is
an area where we're making continuous headway.
This commit is contained in:
Andreas Kling 2022-08-24 15:56:26 +02:00
parent 5a804b9a1d
commit 2c72d495a3
33 changed files with 141 additions and 138 deletions
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16
Kernel/Memory/AnonymousVMObject.h
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@ -20,12 +20,12 @@ public:
static ErrorOr<NonnullLockRefPtr<AnonymousVMObject>> try_create_with_size(size_t, AllocationStrategy);
static ErrorOr<NonnullLockRefPtr<AnonymousVMObject>> try_create_for_physical_range(PhysicalAddress paddr, size_t size);
static ErrorOr<NonnullLockRefPtr<AnonymousVMObject>> try_create_with_physical_pages(Span<NonnullLockRefPtr<PhysicalPage>>);
static ErrorOr<NonnullLockRefPtr<AnonymousVMObject>> try_create_with_physical_pages(Span<NonnullRefPtr<PhysicalPage>>);
static ErrorOr<NonnullLockRefPtr<AnonymousVMObject>> try_create_purgeable_with_size(size_t, AllocationStrategy);
static ErrorOr<NonnullLockRefPtr<AnonymousVMObject>> try_create_physically_contiguous_with_size(size_t);
virtual ErrorOr<NonnullLockRefPtr<VMObject>> try_clone() override;
[[nodiscard]] NonnullLockRefPtr<PhysicalPage> allocate_committed_page(Badge<Region>);
[[nodiscard]] NonnullRefPtr<PhysicalPage> allocate_committed_page(Badge<Region>);
PageFaultResponse handle_cow_fault(size_t, VirtualAddress);
size_t cow_pages() const;
bool should_cow(size_t page_index, bool) const;
@ -41,12 +41,12 @@ public:
private:
class SharedCommittedCowPages;
static ErrorOr<NonnullLockRefPtr<AnonymousVMObject>> try_create_with_shared_cow(AnonymousVMObject const&, NonnullLockRefPtr<SharedCommittedCowPages>, FixedArray<LockRefPtr<PhysicalPage>>&&);
static ErrorOr<NonnullLockRefPtr<AnonymousVMObject>> try_create_with_shared_cow(AnonymousVMObject const&, NonnullLockRefPtr<SharedCommittedCowPages>, FixedArray<RefPtr<PhysicalPage>>&&);
explicit AnonymousVMObject(FixedArray<LockRefPtr<PhysicalPage>>&&, AllocationStrategy, Optional<CommittedPhysicalPageSet>);
explicit AnonymousVMObject(PhysicalAddress, FixedArray<LockRefPtr<PhysicalPage>>&&);
explicit AnonymousVMObject(FixedArray<LockRefPtr<PhysicalPage>>&&);
explicit AnonymousVMObject(LockWeakPtr<AnonymousVMObject>, NonnullLockRefPtr<SharedCommittedCowPages>, FixedArray<LockRefPtr<PhysicalPage>>&&);
explicit AnonymousVMObject(FixedArray<RefPtr<PhysicalPage>>&&, AllocationStrategy, Optional<CommittedPhysicalPageSet>);
explicit AnonymousVMObject(PhysicalAddress, FixedArray<RefPtr<PhysicalPage>>&&);
explicit AnonymousVMObject(FixedArray<RefPtr<PhysicalPage>>&&);
explicit AnonymousVMObject(LockWeakPtr<AnonymousVMObject>, NonnullLockRefPtr<SharedCommittedCowPages>, FixedArray<RefPtr<PhysicalPage>>&&);
virtual StringView class_name() const override { return "AnonymousVMObject"sv; }
@ -74,7 +74,7 @@ private:
[[nodiscard]] bool is_empty() const { return m_committed_pages.is_empty(); }
[[nodiscard]] NonnullLockRefPtr<PhysicalPage> take_one();
[[nodiscard]] NonnullRefPtr<PhysicalPage> take_one();
void uncommit_one();
private: