From a7212a748846630190ca54080e11e1db73b3a11a Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Mon, 3 Apr 2023 16:00:17 +0200
Subject: [PATCH] Kernel: Mark sys$open as not needing the big lock

All the individual sub-operations of this syscall are protected by their
own locking mechanisms, so it should be okay to get it off the big lock.
---
 Kernel/API/Syscall.h     | 2 +-
 Kernel/Syscalls/open.cpp | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Kernel/API/Syscall.h b/Kernel/API/Syscall.h
index de3985fe98..f35368208a 100644
--- a/Kernel/API/Syscall.h
+++ b/Kernel/API/Syscall.h
@@ -131,7 +131,7 @@ enum class NeedsBigProcessLock {
     S(mremap, NeedsBigProcessLock::Yes)                     \
     S(msync, NeedsBigProcessLock::Yes)                      \
     S(munmap, NeedsBigProcessLock::Yes)                     \
-    S(open, NeedsBigProcessLock::Yes)                       \
+    S(open, NeedsBigProcessLock::No)                        \
     S(perf_event, NeedsBigProcessLock::Yes)                 \
     S(perf_register_string, NeedsBigProcessLock::Yes)       \
     S(pipe, NeedsBigProcessLock::No)                        \
diff --git a/Kernel/Syscalls/open.cpp b/Kernel/Syscalls/open.cpp
index 740d5255cd..2ea0cc1e80 100644
--- a/Kernel/Syscalls/open.cpp
+++ b/Kernel/Syscalls/open.cpp
@@ -16,7 +16,7 @@ namespace Kernel {
 
 ErrorOr<FlatPtr> Process::sys$open(Userspace<Syscall::SC_open_params const*> user_params)
 {
-    VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
+    VERIFY_NO_PROCESS_BIG_LOCK(this);
     auto params = TRY(copy_typed_from_user(user_params));
 
     int dirfd = params.dirfd;