[OS-BUILD PATCHv4 1/2] redhat: Add mark_driver_deprecated()

[Phil Sutter (via Email Bridge)]

From: Phil Sutter <psutter(a)redhat.com&gt;

redhat: Add mark_driver_deprecated()

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1945179
Upstream Status: RHEL-only

Allow marking drivers deprecated. The printed message is basically
identical to what mark_hardware_deprecated() prints but generalized a
bit to cover non-hardware drivers also. Semantically, the introduced
function aligns with mark_driver_unsupported().

Signed-off-by: Phil Sutter <psutter(a)redhat.com&gt;

diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index blahblah..blahblah 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -538,11 +538,13 @@ void mark_hardware_unsupported(const char *msg);
 void mark_hardware_deprecated(const char *msg);
 void mark_tech_preview(const char *msg, struct module *mod);
 void mark_driver_unsupported(const char *name);
+void mark_driver_deprecated(const char *name);
 #else
 static inline void mark_hardware_unsupported(const char *msg) { }
 static inline void mark_hardware_deprecated(const char *msg) { }
 static inline void mark_tech_preview(const char *msg, struct module *mod) { }
 static inline void mark_driver_unsupported(const char *name) { }
+static inline void mark_driver_deprecated(const char *name) { }
 #endif
 
 #endif
diff --git a/kernel/rh_taint.c b/kernel/rh_taint.c
index blahblah..blahblah 100644
--- a/kernel/rh_taint.c
+++ b/kernel/rh_taint.c
@@ -91,3 +91,19 @@ void mark_driver_unsupported(const char *name)
 	        name ? name : "kernel");
 }
 EXPORT_SYMBOL(mark_driver_unsupported);
+
+/**
+ * mark_driver_deprecated() - Mark drivers as deprecated.
+ * @name: the name of the driver
+ *
+ * Called to minimize the support status of a previously supported driver in
+ * a minor release. This does not TAINT the kernel. Future
+ * RHEL major releases may not include this driver. Driver updates and fixes
+ * will be limited to critical issues in future minor releases.
+ */
+void mark_driver_deprecated(const char *name)
+{
+	pr_crit("Warning: %s - this driver is not recommended for new deployments. It
continues to be supported in this RHEL release, but it is likely to be removed in the next
major release. Driver updates and fixes will be limited to critical issues. Please contact
Red Hat Support for additional information.\n",
+	        name ? name : "kernel");
+}
+EXPORT_SYMBOL(mark_driver_deprecated);

--
https://gitlab.com/cki-project/kernel-ark/-/merge_requests/1226