linux-kernel - [PATCH v2 1/3] RAS: Export helper to get ras_debugfs

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Date: Fri, 1 Mar 2024 08:37:46 -0600
From: Yazen Ghannam <yazen.ghannam@....com>
To: <bp@...en8.de>, <tony.luck@...el.com>, <linux-edac@...r.kernel.org>
CC: <linux-kernel@...r.kernel.org>, <avadhut.naik@....com>,
	<john.allen@....com>, <muralidhara.mk@....com>, <sathyapriya.k@....com>,
	<naveenkrishna.chatradhi@....com>, Yazen Ghannam <yazen.ghannam@....com>
Subject: [PATCH v2 1/3] RAS: Export helper to get ras_debugfs_dir

From: "Borislav Petkov (AMD)" <bp@...en8.de>

..so that RAS modules can use it.

Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
---
Link:
https://lore.kernel.org/r/20240226152941.2615007-2-yazen.ghannam@amd.com

v1->v2:
* Replace with patch from Boris to export a function.
* Added commit message and authorship to patch from Boris.

 drivers/ras/cec.c     | 10 ++++++++--
 drivers/ras/debugfs.c |  8 +++++++-
 drivers/ras/debugfs.h |  2 +-
 3 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/drivers/ras/cec.c b/drivers/ras/cec.c
index 321af498ee11..e440b15fbabc 100644
--- a/drivers/ras/cec.c
+++ b/drivers/ras/cec.c
@@ -480,9 +480,15 @@ DEFINE_SHOW_ATTRIBUTE(array);
 
 static int __init create_debugfs_nodes(void)
 {
-	struct dentry *d, *pfn, *decay, *count, *array;
+	struct dentry *d, *pfn, *decay, *count, *array, *dfs;
 
-	d = debugfs_create_dir("cec", ras_debugfs_dir);
+	dfs = ras_get_debugfs_root();
+	if (!dfs) {
+		pr_warn("Error getting RAS debugfs root!\n");
+		return -1;
+	}
+
+	d = debugfs_create_dir("cec", dfs);
 	if (!d) {
 		pr_warn("Error creating cec debugfs node!\n");
 		return -1;
diff --git a/drivers/ras/debugfs.c b/drivers/ras/debugfs.c
index ffb973c328e3..42afd3de68b2 100644
--- a/drivers/ras/debugfs.c
+++ b/drivers/ras/debugfs.c
@@ -3,10 +3,16 @@
 #include <linux/ras.h>
 #include "debugfs.h"
 
-struct dentry *ras_debugfs_dir;
+static struct dentry *ras_debugfs_dir;
 
 static atomic_t trace_count = ATOMIC_INIT(0);
 
+struct dentry *ras_get_debugfs_root(void)
+{
+	return ras_debugfs_dir;
+}
+EXPORT_SYMBOL_GPL(ras_get_debugfs_root);
+
 int ras_userspace_consumers(void)
 {
 	return atomic_read(&trace_count);
diff --git a/drivers/ras/debugfs.h b/drivers/ras/debugfs.h
index c07443b462ad..4749ccdeeba1 100644
--- a/drivers/ras/debugfs.h
+++ b/drivers/ras/debugfs.h
@@ -4,6 +4,6 @@
 
 #include <linux/debugfs.h>
 
-extern struct dentry *ras_debugfs_dir;
+struct dentry *ras_get_debugfs_root(void);
 
 #endif /* __RAS_DEBUGFS_H__ */
-- 
2.34.1