From f630d0f095552196199c7334973f57dd7d44f352 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Mon, 7 Mar 2022 17:44:27 +0100
Subject: [PATCH] Kernel: Mark sys$realpath() as not needing the big lock

This syscall doesn't access any data that was implicitly protected by
the big lock.
---
 Kernel/API/Syscall.h         | 2 +-
 Kernel/Syscalls/realpath.cpp | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Kernel/API/Syscall.h b/Kernel/API/Syscall.h
index 9fbd375c79..fc59cbe901 100644
--- a/Kernel/API/Syscall.h
+++ b/Kernel/API/Syscall.h
@@ -144,7 +144,7 @@ enum class NeedsBigProcessLock {
     S(pread, NeedsBigProcessLock::Yes)                      \
     S(readlink, NeedsBigProcessLock::Yes)                   \
     S(readv, NeedsBigProcessLock::Yes)                      \
-    S(realpath, NeedsBigProcessLock::Yes)                   \
+    S(realpath, NeedsBigProcessLock::No)                    \
     S(recvfd, NeedsBigProcessLock::Yes)                     \
     S(recvmsg, NeedsBigProcessLock::Yes)                    \
     S(rename, NeedsBigProcessLock::Yes)                     \
diff --git a/Kernel/Syscalls/realpath.cpp b/Kernel/Syscalls/realpath.cpp
index e1feed2eb7..bda04d2e8a 100644
--- a/Kernel/Syscalls/realpath.cpp
+++ b/Kernel/Syscalls/realpath.cpp
@@ -13,7 +13,7 @@ namespace Kernel {
 
 ErrorOr<FlatPtr> Process::sys$realpath(Userspace<const Syscall::SC_realpath_params*> user_params)
 {
-    VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
+    VERIFY_NO_PROCESS_BIG_LOCK(this);
     TRY(require_promise(Pledge::rpath));
     auto params = TRY(copy_typed_from_user(user_params));