linux-kernel - Re: [PATCH 2/5] jump label: constify lookup functions

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Date:	Fri, 18 Jan 2013 16:25:00 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	fweisbec@...il.com, rusty@...tcorp.com.au, ananth@...ibm.com,
	anil.s.keshavamurthy@...el.com, masami.hiramatsu.pt@...achi.com,
	jbaron@...hat.com, x86@...nel.org, linux-kernel@...r.kernel.org,
	MartinSchwidefsky <schwidefsky@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	linux-s390 <linux-s390@...r.kernel.org>
Subject: Re: [PATCH 2/5] jump label: constify lookup functions

On Wed, 2013-01-09 at 18:09 -0500, Sasha Levin wrote:
> Modify the parameters of all the lookup and the bookkeeping functions which
> should be const to const.
> 
> For example, jump_label_text_reserved() doesn't modify the memory it works on,
> it just checks whether there are any jump labels there.

This is dependent on the module patch, which Rusty is taking. I need to
see that he has it before this can go in. At least see it in linux-next.

Also, you should have Cc'd the linux-arch mailing list. I'll send it
there.

> 
> Note I couldn't test the non-x86 architectures, but the changes are rather
> trivial.

I ran it on 25 archs, and s390 hit:

/work/autotest/nobackup/cross-linux.git/arch/s390/kernel/jump_label.c: In function 'arch_jump_label_transform':
/work/autotest/nobackup/cross-linux.git/arch/s390/kernel/jump_label.c:58:13: warning: assignment discards 'const' qualifier from pointer target type [enabled by default]

-- Steve

Here's the patch:

Signed-off-by: Steven Rostedt <rostedt@...dmis.org>

diff --git a/arch/s390/kernel/jump_label.c
b/arch/s390/kernel/jump_label.c
index 85fa643..ef047ef 100644
--- a/arch/s390/kernel/jump_label.c
+++ b/arch/s390/kernel/jump_label.c
@@ -18,7 +18,7 @@ struct insn {
 } __packed;
 
 struct insn_args {
-	struct jump_entry *entry;
+	const struct jump_entry *entry;
 	enum jump_label_type type;
 };
 


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