[PATCH 3/4] drm/i915/params: use generics for parameter free

[Jani Nikula <jani.nikula@xxxxxxxxx>]

Replace the __builtin_strcmp() if ladder with generics.

Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
---
 drivers/gpu/drm/i915/i915_params.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c
index f9d92d0ab2b5..ade744cccfea 100644
--- a/drivers/gpu/drm/i915/i915_params.c
+++ b/drivers/gpu/drm/i915/i915_params.c
@@ -296,18 +296,21 @@ void i915_params_copy(struct i915_params *dest, const struct i915_params *src)
 #undef DUP
 }
 
-static __always_inline void free_param(const char *type, void *x)
+static void _param_free_charp(char **valp)
 {
-	if (!__builtin_strcmp(type, "char *")) {
-		kfree(*(void **)x);
-		*(void **)x = NULL;
-	}
+	kfree(*valp);
+	*valp = NULL;
 }
 
+#define _param_free(valp)				\
+	_Generic(valp,					\
+		 char **: _param_free_charp,		\
+		 default: _param_nop)(valp)
+
 /* free the allocated members, *not* the passed in params itself */
 void i915_params_free(struct i915_params *params)
 {
-#define FREE(T, x, ...) free_param(#T, &params->x);
+#define FREE(T, x, ...) _param_free(&params->x);
 	I915_PARAMS_FOR_EACH(FREE);
 #undef FREE
 }
-- 
2.34.1