linux-kernel - Re: [PATCHv3 2/3] kernel: add support for live patching

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Date:	Fri, 21 Nov 2014 18:35:47 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	Seth Jennings <sjenning@...hat.com>, Jiri Kosina <jkosina@...e.cz>
CC:	Josh Poimboeuf <jpoimboe@...hat.com>,
	Vojtech Pavlik <vojtech@...e.cz>,
	Steven Rostedt <rostedt@...dmis.org>,
	Petr Mladek <pmladek@...e.cz>, Miroslav Benes <mbenes@...e.cz>,
	Christoph Hellwig <hch@...radead.org>,
	Greg KH <gregkh@...uxfoundation.org>,
	Andy Lutomirski <luto@...capital.net>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	live-patching@...r.kernel.org, x86@...nel.org, kpatch@...hat.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCHv3 2/3] kernel: add support for live patching

On 11/21/2014, 05:40 PM, Seth Jennings wrote:
>>> --- /dev/null
>>> +++ b/arch/x86/include/asm/livepatch.h
>>> @@ -0,0 +1,37 @@
...
>>> +#ifndef _ASM_X86_LIVEPATCH_H
>>> +#define _ASM_X86_LIVEPATCH_H
>>> +
>>> +#include <linux/module.h>
>>> +
>>> +#ifdef CONFIG_LIVE_PATCHING
>>> +extern int klp_write_module_reloc(struct module *mod, unsigned long type,
>>> +				  unsigned long loc, unsigned long value);
>>> +
>>> +#else
>>> +static int klp_write_module_reloc(struct module *mod, unsigned long type,
>>
>> static inline?
> 
> I think the practice is to let the compiler handle inline determination
> unless you are sure that the compiler isn't inlining something you think
> it should.

Although you are right, it is a correct C, gcc specs (6.39) suggests to
use 'static inline' on such functions. gcc then shall inline such functions.

And if you look around in the kernel, we use that combination almost
everywhere.

thanks,
-- 
js
suse labs
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