linux-kernel - [PATCH v1 20/32] kho: move kho debugfs directory to liveupdate

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Message-ID: <20250625231838.1897085-21-pasha.tatashin@soleen.com>
Date: Wed, 25 Jun 2025 23:18:07 +0000
From: Pasha Tatashin <pasha.tatashin@...een.com>
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Subject: [PATCH v1 20/32] 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 LUO selftests could use
it as well.

Signed-off-by: Pasha Tatashin <pasha.tatashin@...een.com>
---
 kernel/liveupdate/kexec_handover_debug.c | 11 ++++++-----
 kernel/liveupdate/luo_internal.h         |  4 ++++
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/kernel/liveupdate/kexec_handover_debug.c b/kernel/liveupdate/kexec_handover_debug.c
index af4bad225630..f06d6cdfeab3 100644
--- a/kernel/liveupdate/kexec_handover_debug.c
+++ b/kernel/liveupdate/kexec_handover_debug.c
@@ -14,8 +14,9 @@
 #include <linux/libfdt.h>
 #include <linux/mm.h>
 #include "kexec_handover_internal.h"
+#include "luo_internal.h"
 
-static struct dentry *debugfs_root;
+struct dentry *liveupdate_debugfs_root;
 
 struct fdt_debugfs {
 	struct list_head list;
@@ -120,7 +121,7 @@ __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("in", liveupdate_debugfs_root);
 	if (IS_ERR(dir)) {
 		err = PTR_ERR(dir);
 		goto err_out;
@@ -180,7 +181,7 @@ __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("out", liveupdate_debugfs_root);
 	if (IS_ERR(dir))
 		return -ENOMEM;
 
@@ -214,8 +215,8 @@ __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/luo_internal.h b/kernel/liveupdate/luo_internal.h
index 8fef414e7e3e..fbb9c6642d19 100644
--- a/kernel/liveupdate/luo_internal.h
+++ b/kernel/liveupdate/luo_internal.h
@@ -40,4 +40,8 @@ void luo_sysfs_notify(void);
 static inline void luo_sysfs_notify(void) {}
 #endif
 
+#ifdef CONFIG_KEXEC_HANDOVER_DEBUG
+extern struct dentry *liveupdate_debugfs_root;
+#endif
+
 #endif /* _LINUX_LUO_INTERNAL_H */
-- 
2.50.0.727.gbf7dc18ff4-goog