From 0e564240a63ae7d85c91fce85af63fb71d24c794 Mon Sep 17 00:00:00 2001
From: Idan Horowitz <idan.horowitz@gmail.com>
Date: Tue, 4 Apr 2023 14:00:38 +0300
Subject: [PATCH] Kernel: Mark sys$madvise 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 6ea599f6bd..dec6baa4b5 100644
--- a/Kernel/API/Syscall.h
+++ b/Kernel/API/Syscall.h
@@ -121,7 +121,7 @@ enum class NeedsBigProcessLock {
     S(link, NeedsBigProcessLock::No)                       \
     S(listen, NeedsBigProcessLock::No)                     \
     S(lseek, NeedsBigProcessLock::No)                      \
-    S(madvise, NeedsBigProcessLock::Yes)                   \
+    S(madvise, NeedsBigProcessLock::No)                    \
     S(map_time_page, NeedsBigProcessLock::Yes)             \
     S(mkdir, NeedsBigProcessLock::No)                      \
     S(mknod, NeedsBigProcessLock::No)                      \
diff --git a/Kernel/Syscalls/mmap.cpp b/Kernel/Syscalls/mmap.cpp
index 577545aa73..73a7b3b852 100644
--- a/Kernel/Syscalls/mmap.cpp
+++ b/Kernel/Syscalls/mmap.cpp
@@ -407,7 +407,7 @@ ErrorOr<FlatPtr> Process::sys$mprotect(Userspace<void*> addr, size_t size, int p
 
 ErrorOr<FlatPtr> Process::sys$madvise(Userspace<void*> address, size_t size, int advice)
 {
-    VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this);
+    VERIFY_NO_PROCESS_BIG_LOCK(this);
     TRY(require_promise(Pledge::stdio));
 
     auto range_to_madvise = TRY(Memory::expand_range_to_page_boundaries(address.ptr(), size));