clk: convert clock name allocations to kstrdup_const

Clock subsystem frequently performs duplication of strings located in
read-only memory section.  Replacing kstrdup by kstrdup_const allows to
avoid such operations.

Signed-off-by: Andrzej Hajda <a.hajda@samsung.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Mike Turquette <mturquette@linaro.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Greg KH <greg@kroah.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/clk/clk.c

@@ -2048,7 +2048,7 @@ struct clk *clk_register(struct device *dev, struct clk_hw *hw)
 		goto fail_out;
 	}
 
-	clk->name = kstrdup(hw->init->name, GFP_KERNEL);
+	clk->name = kstrdup_const(hw->init->name, GFP_KERNEL);
 	if (!clk->name) {
 		pr_err("%s: could not allocate clk->name\n", __func__);
 		ret = -ENOMEM;
@@ -2075,7 +2075,7 @@ struct clk *clk_register(struct device *dev, struct clk_hw *hw)
 
 	/* copy each string name in case parent_names is __initdata */
 	for (i = 0; i < clk->num_parents; i++) {
-		clk->parent_names[i] = kstrdup(hw->init->parent_names[i],
+		clk->parent_names[i] = kstrdup_const(hw->init->parent_names[i],
 						GFP_KERNEL);
 		if (!clk->parent_names[i]) {
 			pr_err("%s: could not copy parent_names\n", __func__);
@@ -2090,10 +2090,10 @@ struct clk *clk_register(struct device *dev, struct clk_hw *hw)
 
 fail_parent_names_copy:
 	while (--i >= 0)
-		kfree(clk->parent_names[i]);
+		kfree_const(clk->parent_names[i]);
 	kfree(clk->parent_names);
 fail_parent_names:
-	kfree(clk->name);
+	kfree_const(clk->name);
 fail_name:
 	kfree(clk);
 fail_out:
@@ -2112,10 +2112,10 @@ static void __clk_release(struct kref *ref)
 
 	kfree(clk->parents);
 	while (--i >= 0)
-		kfree(clk->parent_names[i]);
+		kfree_const(clk->parent_names[i]);
 
 	kfree(clk->parent_names);
-	kfree(clk->name);
+	kfree_const(clk->name);
 	kfree(clk);
 }