linux-kernel - Re: [RFC][PATCH 6/7] jump_label: Add a new static

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Date:	Mon, 27 Jul 2015 16:39:24 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org,
	jasonbaron0@...il.com, bp@...en8.de, luto@...capital.net,
	tglx@...utronix.de, rostedt@...dmis.org, will.deacon@....com,
	liuj97@...il.com, rabin@....in, ralf@...ux-mips.org,
	ddaney@...iumnetworks.com, benh@...nel.crashing.org,
	michael@...erman.id.au, davem@...emloft.net
Subject: Re: [RFC][PATCH 6/7] jump_label: Add a new static_key interface

On Mon, Jul 27, 2015 at 12:52:42PM +0200, Heiko Carstens wrote:
> Yeah, just did that and it crashes ;)

Does this make it go?

---
--- a/kernel/jump_label.c
+++ b/kernel/jump_label.c
@@ -221,7 +221,10 @@ void __init jump_label_init(void)
 	for (iter = iter_start; iter < iter_stop; iter++) {
 		struct static_key *iterk;
 
-		arch_jump_label_transform_static(iter, jump_label_type(iter));
+		/* rewrite NOPs */
+		if (jump_label_type(iter) == JUMP_LABEL_NOP)
+			arch_jump_label_transform_static(iter, JUMP_LABEL_NOP);
+
 		iterk = jump_entry_key(iter);
 		if (iterk == key)
 			continue;
--
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