From 2f79d0e8b9888fc3dd35db119d3a951373a7ac58 Mon Sep 17 00:00:00 2001
From: Idan Horowitz <idan.horowitz@gmail.com>
Date: Tue, 4 Apr 2023 14:11:38 +0300
Subject: [PATCH] Kernel: Mark sys$mprotect as not needing the big lock

All accesses to shared mutable data are already serialized behind the
process address space spinlock.
---
 Kernel/API/Syscall.h     | 2 +-
 Kernel/Syscalls/mmap.cpp | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Kernel/API/Syscall.h b/Kernel/API/Syscall.h
index 2a90d2900d..3b91d57c03 100644
--- a/Kernel/API/Syscall.h
+++ b/Kernel/API/Syscall.h
@@ -127,7 +127,7 @@ enum class NeedsBigProcessLock {
     S(mknod, NeedsBigProcessLock::No)                      \
     S(mmap, NeedsBigProcessLock::No)                       \
     S(mount, NeedsBigProcessLock::Yes)                     \
-    S(mprotect, NeedsBigProcessLock::Yes)                  \
+    S(mprotect, NeedsBigProcessLock::No)                   \
     S(mremap, NeedsBigProcessLock::Yes)                    \
     S(msync, NeedsBigProcessLock::Yes)                     \
     S(munmap, NeedsBigProcessLock::Yes)                    \
diff --git a/Kernel/Syscalls/mmap.cpp b/Kernel/Syscalls/mmap.cpp
index f55cbc5ecc..31b84f3ccc 100644
--- a/Kernel/Syscalls/mmap.cpp
+++ b/Kernel/Syscalls/mmap.cpp
@@ -268,7 +268,7 @@ ErrorOr<FlatPtr> Process::sys$mmap(Userspace<Syscall::SC_mmap_params const*> use
 
 ErrorOr<FlatPtr> Process::sys$mprotect(Userspace<void*> addr, size_t size, int prot)
 {
-    VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
+    VERIFY_NO_PROCESS_BIG_LOCK(this);
     TRY(require_promise(Pledge::stdio));
 
     if (prot & PROT_EXEC) {