linux-kernel - [PATCH v5 7/7] kho: move kho debugfs directory to liveupdate

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Message-ID: <20251007033100.836886-8-pasha.tatashin@soleen.com>
Date: Tue,  7 Oct 2025 03:31:00 +0000
From: Pasha Tatashin <pasha.tatashin@...een.com>
To: akpm@...ux-foundation.org,
	brauner@...nel.org,
	corbet@....net,
	graf@...zon.com,
	jgg@...pe.ca,
	linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	linux-mm@...ck.org,
	masahiroy@...nel.org,
	ojeda@...nel.org,
	pasha.tatashin@...een.com,
	pratyush@...nel.org,
	rdunlap@...radead.org,
	rppt@...nel.org,
	tj@...nel.org
Subject: [PATCH v5 7/7] kho: move kho debugfs directory to liveupdate

Now, that LUO and KHO both live under kernel/liveupdate, it makes
sense to also move the kho debugfs files to liveupdate/

The old names:
/sys/kernel/debug/kho/out/
/sys/kernel/debug/kho/in/

The new names:
/sys/kernel/debug/liveupdate/kho_out/
/sys/kernel/debug/liveupdate/kho_in/

Also, export the liveupdate_debufs_root, so future LUO selftests could
use it as well.

Signed-off-by: Pasha Tatashin <pasha.tatashin@...een.com>
---
 kernel/liveupdate/kexec_handover_debug.c    | 10 +++++-----
 kernel/liveupdate/kexec_handover_internal.h |  2 ++
 tools/testing/selftests/kho/init.c          |  2 +-
 3 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/kernel/liveupdate/kexec_handover_debug.c b/kernel/liveupdate/kexec_handover_debug.c
index d4ac78d53a39..eb47f000887d 100644
--- a/kernel/liveupdate/kexec_handover_debug.c
+++ b/kernel/liveupdate/kexec_handover_debug.c
@@ -15,7 +15,7 @@
 #include <linux/mm.h>
 #include "kexec_handover_internal.h"
 
-static struct dentry *debugfs_root;
+struct dentry *liveupdate_debugfs_root;
 
 struct fdt_debugfs {
 	struct list_head list;
@@ -115,7 +115,7 @@ __init void kho_in_debugfs_init(struct kho_debugfs *dbg, const void *fdt)
 
 	INIT_LIST_HEAD(&dbg->fdt_list);
 
-	dir = debugfs_create_dir("in", debugfs_root);
+	dir = debugfs_create_dir("kho_in", liveupdate_debugfs_root);
 	if (IS_ERR(dir)) {
 		err = PTR_ERR(dir);
 		goto err_out;
@@ -175,7 +175,7 @@ __init int kho_out_debugfs_init(struct kho_debugfs *dbg)
 
 	INIT_LIST_HEAD(&dbg->fdt_list);
 
-	dir = debugfs_create_dir("out", debugfs_root);
+	dir = debugfs_create_dir("kho_out", liveupdate_debugfs_root);
 	if (IS_ERR(dir))
 		return -ENOMEM;
 
@@ -209,8 +209,8 @@ __init int kho_out_debugfs_init(struct kho_debugfs *dbg)
 
 __init int kho_debugfs_init(void)
 {
-	debugfs_root = debugfs_create_dir("kho", NULL);
-	if (IS_ERR(debugfs_root))
+	liveupdate_debugfs_root = debugfs_create_dir("liveupdate", NULL);
+	if (IS_ERR(liveupdate_debugfs_root))
 		return -ENOENT;
 	return 0;
 }
diff --git a/kernel/liveupdate/kexec_handover_internal.h b/kernel/liveupdate/kexec_handover_internal.h
index de90a678274d..b3fc1957affa 100644
--- a/kernel/liveupdate/kexec_handover_internal.h
+++ b/kernel/liveupdate/kexec_handover_internal.h
@@ -15,6 +15,8 @@ struct kho_debugfs {
 	struct list_head fdt_list;
 };
 
+extern struct dentry *liveupdate_debugfs_root;
+
 #else
 struct kho_debugfs {};
 #endif
diff --git a/tools/testing/selftests/kho/init.c b/tools/testing/selftests/kho/init.c
index 6d9e91d55d68..f0136a30ce8b 100644
--- a/tools/testing/selftests/kho/init.c
+++ b/tools/testing/selftests/kho/init.c
@@ -11,7 +11,7 @@
 /* from arch/x86/include/asm/setup.h */
 #define COMMAND_LINE_SIZE	2048
 
-#define KHO_FINALIZE "/debugfs/kho/out/finalize"
+#define KHO_FINALIZE "/debugfs/liveupdate/kho_out/finalize"
 #define KERNEL_IMAGE "/kernel"
 
 static int mount_filesystems(void)
-- 
2.51.0.618.g983fd99d29-goog