NE_STATIC_CALL(xor_gen_impl, xor_gen_32regs);
 
 /**
  * xor_gen - generate RAID-style XOR information
@@ -32,13 +36,13 @@ static struct xor_block_template *active_template;
 void xor_gen(void *dest, void **srcs, unsigned int src_cnt, unsigned int bytes)
 {
 	WARN_ON_ONCE(in_interrupt());
-	active_template->xor_gen(dest, srcs, src_cnt, bytes);
+	static_call(xor_gen_impl)(dest, srcs, src_cnt, bytes);
 }
 EXPORT_SYMBOL(xor_gen);
 
 /* Set of all registered templates.  */
 static struct xor_block_template *__initdata template_list;
-static int __initdata xor_forced = false;
+static struct xor_block_template *forced_template;
 
 /**
  * xor_register - register a XOR template
@@ -64,7 +68,7 @@ void __init xor_register(struct xor_block_template *tmpl)
  */
 void __init xor_force(struct xor_block_template *tmpl)
 {
-	active_template = tmpl;
+	forced_template = tmpl;
 }
 
 #define BENCH_SIZE	4096
@@ -106,7 +110,7 @@ static int __init calibrate_xor_blocks(void)
 	void *b1, *b2;
 	struct xor_block_template *f, *fastest;
 
-	if (xor_forced)
+	if (forced_template)
 		return 0;
 
 	b1 = (void *) __get_free_pages(GFP_KERNEL, 2);
@@ -123,7 +127,7 @@ static int __init calibrate_xor_blocks(void)
 		if (f->speed > fastest->speed)
 			fastest = f;
 	}
-	active_template = fastest;
+	static_call_update(xor_gen_impl, fastest->xor_gen);
 	pr_info("xor: using function: %s (%d MB/sec)\n",
 	       fastest->name, fastest->speed);
 
@@ -151,21 +155,16 @@ static int __init xor_init(void)
 	 * If this arch/cpu has a short-circuited selection, don't loop through
 	 * all the possible functions, just use the best one.
 	 */
-	if (active_template) {
+	if (forced_template) {
 		pr_info("xor: automatically using best checksumming function   %-10s\n",
-			active_template->name);
-		xor_forced = true;
+			forced_template->name);
+		static_call_update(xor_gen_impl, forced_template->xor_gen);
 		return 0;
 	}
 
 #ifdef MODULE
 	return calibrate_xor_blocks();
 #else
-	/*
-	 * Pick the first template as the temporary default until calibration
-	 * happens.
-	 */
-	active_template = template_list;
 	return 0;
 #endif
 }
diff --git a/lib/raid/xor/xor_impl.h b/lib/raid/xor/xor_impl.h
index 968dd07df627..f11910162b08 100644
--- a/lib/raid/xor/xor_impl.h
+++ b/lib/raid/xor/xor_impl.h
@@ -50,6 +50,10 @@ extern struct xor_block_template xor_block_32regs;
 extern struct xor_block_template xor_block_8regs_p;
 extern struct xor_block_template xor_block_32regs_p;
 
+/* default call until updated */
+void xor_gen_32regs(void *dest, void **srcs, unsigned int src_cnt,
+		unsigned int bytes);
+
 void __init xor_register(struct xor_block_template *tmpl);
 void __init xor_force(struct xor_block_template *tmpl);
 
-- 
2.47.3[PATCH 25/25] xor: use static_call for xor_genChristoph Hellwig <hch@lst.de> undefinedAndrew Morton <akpm@linux-foundation.org> undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined„C† +