kernel: suggest non-gki kernel users to backport path_umount

Most non-gki kernel builders have to touch their kernel source code anyway. Tell them to backport path_umount, spread the news so they can benefit. Discussion: #1464 Co-Authored-By: Fede2782 <[email protected]> Co-Authored-By: backslashxx <[email protected]> Co-Authored-By: Tom <[email protected]>
tiann · Mar 18, 2024 · 7cc8108 · 7cc8108
1 parent 6281b85
commit 7cc8108
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diff --git a/kernel/Makefile b/kernel/Makefile
@@ -62,6 +62,13 @@ $(info -- KernelSU Manager signature hash: $(KSU_EXPECTED_HASH))
 ccflags-y += -DEXPECTED_SIZE=$(KSU_EXPECTED_SIZE)
 ccflags-y += -DEXPECTED_HASH=\"$(KSU_EXPECTED_HASH)\"
 
+ifeq ($(shell grep -q "int path_umount" $(srctree)/fs/namespace.c; echo $$?),0)
+ccflags-y += -DKSU_UMOUNT
+else
+$(info -- Did you know you can backport path_umount to fs/namespace.c from 5.9?)
+$(info -- Read: https://kernelsu.org/guide/how-to-integrate-for-non-gki.html#path_umount)
+endif
+
 ccflags-y += -Wno-implicit-function-declaration -Wno-strict-prototypes -Wno-int-conversion -Wno-gcc-compat
 ccflags-y += -Wno-declaration-after-statement -Wno-unused-function
 

diff --git a/kernel/core_hook.c b/kernel/core_hook.c
@@ -513,7 +513,7 @@ static bool should_umount(struct path *path)
 
 static void ksu_umount_mnt(struct path *path, int flags)
 {
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 9, 0)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(5, 9, 0) || KSU_UMOUNT
 	int err = path_umount(path, flags);
 	if (err) {
 		pr_info("umount %s failed: %d\n", path->dentry->d_iname, err);