From e1633e77072bc72c224c028f5e199ea1b10d90e3 Mon Sep 17 00:00:00 2001
From: Chaoqun Zheng <1667510710@qq.com>
Date: Mon, 8 Dec 2025 09:48:24 +0800
Subject: [PATCH] Add some stubs for `madvise`.

---
 .../syscall-flag-coverage/memory-management/README.md    | 8 ++++----
 .../syscall-flag-coverage/memory-management/madvise.scml | 3 +++
 kernel/src/syscall/madvise.rs                            | 9 +++++++++
 3 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/book/src/kernel/linux-compatibility/syscall-flag-coverage/memory-management/README.md b/book/src/kernel/linux-compatibility/syscall-flag-coverage/memory-management/README.md
index 6ce7b35bc..256c4fb3e 100644
--- a/book/src/kernel/linux-compatibility/syscall-flag-coverage/memory-management/README.md
+++ b/book/src/kernel/linux-compatibility/syscall-flag-coverage/memory-management/README.md
@@ -90,18 +90,18 @@ Supported functionality in SCML:
 
 Silently-ignored advice:
 * `MADV_DONTNEED`
+* `MADV_NOHUGEPAGE`
+* `MADV_HUGEPAGE`
+* `MADV_MERGEABLE`
+* `MADV_DONTFORK`
 
 Unsupported advice:
 * `MADV_RANDOM`
 * `MADV_REMOVE`
-* `MADV_DONTFORK`
 * `MADV_DOFORK`
 * `MADV_HWPOISON`
-* `MADV_MERGEABLE`
 * `MADV_UNMERGEABLE`
 * `MADV_SOFT_OFFLINE`
-* `MADV_HUGEPAGE`
-* `MADV_NOHUGEPAGE`
 * `MADV_DONTDUMP`
 * `MADV_DODUMP`
 * `MADV_FREE`
diff --git a/book/src/kernel/linux-compatibility/syscall-flag-coverage/memory-management/madvise.scml b/book/src/kernel/linux-compatibility/syscall-flag-coverage/memory-management/madvise.scml
index 2f7af0ef8..808250902 100644
--- a/book/src/kernel/linux-compatibility/syscall-flag-coverage/memory-management/madvise.scml
+++ b/book/src/kernel/linux-compatibility/syscall-flag-coverage/memory-management/madvise.scml
@@ -6,3 +6,6 @@ madvise(addr, length, advice = MADV_SEQUENTIAL);
 
 // Prefetch pages for near-future access to reduce latency
 madvise(addr, length, advice = MADV_WILLNEED);
+
+// Mark pages for lazy reclamation to allow the kernel to free them under memory pressure
+madvise(addr, length, advice = MADV_FREE);
\ No newline at end of file
diff --git a/kernel/src/syscall/madvise.rs b/kernel/src/syscall/madvise.rs
index bafb56b86..771b51d05 100644
--- a/kernel/src/syscall/madvise.rs
+++ b/kernel/src/syscall/madvise.rs
@@ -48,6 +48,15 @@ pub fn sys_madvise(
         MadviseBehavior::MADV_NOHUGEPAGE => {
             warn!("MADV_NOHUGEPAGE isn't implemented, do nothing for now");
         }
+        MadviseBehavior::MADV_HUGEPAGE => {
+            warn!("MADV_HUGEPAGE isn't implemented, do nothing for now");
+        }
+        MadviseBehavior::MADV_MERGEABLE => {
+            warn!("MADV_MERGEABLE isn't implemented, do nothing for now");
+        }
+        MadviseBehavior::MADV_DONTFORK => {
+            warn!("MADV_DONTFORK isn't implemented, do nothing for now");
+        }
         _ => todo!(),
     }
     Ok(SyscallReturn::Return(0))