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Kernel: Mark sys$mremap as not needing the big lock

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All accesses to shared mutable data are already serialized behind the
process address space spinlock.
This commit is contained in:
Idan Horowitz 2023-04-04 14:15:17 +03:00
commit 1dae6a2e4a
Notes: sideshowbarker 2024-07-16 22:54:10 +09:00
2 changed files with 2 additions and 2 deletions
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2
Kernel/API/Syscall.h
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@ -128,7 +128,7 @@ enum class NeedsBigProcessLock {
S(mmap, NeedsBigProcessLock::No) \ S(mmap, NeedsBigProcessLock::No) \
S(mount, NeedsBigProcessLock::Yes) \ S(mount, NeedsBigProcessLock::Yes) \
S(mprotect, NeedsBigProcessLock::No) \ S(mprotect, NeedsBigProcessLock::No) \
S(mremap, NeedsBigProcessLock::Yes) \ S(mremap, NeedsBigProcessLock::No) \
S(msync, NeedsBigProcessLock::Yes) \ S(msync, NeedsBigProcessLock::Yes) \
S(munmap, NeedsBigProcessLock::No) \ S(munmap, NeedsBigProcessLock::No) \
S(open, NeedsBigProcessLock::No) \ S(open, NeedsBigProcessLock::No) \

2
Kernel/Syscalls/mmap.cpp
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@ -480,7 +480,7 @@ ErrorOr<FlatPtr> Process::sys$munmap(Userspace<void*> addr, size_t size)
ErrorOr<FlatPtr> Process::sys$mremap(Userspace<Syscall::SC_mremap_params const*> user_params) ErrorOr<FlatPtr> Process::sys$mremap(Userspace<Syscall::SC_mremap_params const*> user_params)
{ {
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this); VERIFY_NO_PROCESS_BIG_LOCK(this);
TRY(require_promise(Pledge::stdio)); TRY(require_promise(Pledge::stdio));
auto params = TRY(copy_typed_from_user(user_params)); auto params = TRY(copy_typed_from_user(user_params));