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Kernel: Mark sys$mremap as not needing the big lock
All accesses to shared mutable data are already serialized behind the process address space spinlock.
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Notes:
sideshowbarker
2024-07-16 22:54:10 +09:00
Author: https://github.com/IdanHo Commit: https://github.com/SerenityOS/serenity/commit/1dae6a2e4a Pull-request: https://github.com/SerenityOS/serenity/pull/18178 Reviewed-by: https://github.com/awesomekling ✅
@ -128,7 +128,7 @@ enum class NeedsBigProcessLock {
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S(mmap, NeedsBigProcessLock::No) \
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S(mount, NeedsBigProcessLock::Yes) \
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S(mprotect, NeedsBigProcessLock::No) \
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S(mremap, NeedsBigProcessLock::Yes) \
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S(mremap, NeedsBigProcessLock::No) \
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S(msync, NeedsBigProcessLock::Yes) \
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S(munmap, NeedsBigProcessLock::No) \
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S(open, NeedsBigProcessLock::No) \
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@ -480,7 +480,7 @@ ErrorOr<FlatPtr> Process::sys$munmap(Userspace<void*> addr, size_t size)
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ErrorOr<FlatPtr> Process::sys$mremap(Userspace<Syscall::SC_mremap_params const*> user_params)
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{
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VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
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VERIFY_NO_PROCESS_BIG_LOCK(this);
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TRY(require_promise(Pledge::stdio));
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auto params = TRY(copy_typed_from_user(user_params));
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