linux-kernel - Re: [PATCHv2 2/3] kernel: add support for live patching

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Message-ID: <20141117184558.GA13995@kroah.com>
Date:	Mon, 17 Nov 2014 10:45:58 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Seth Jennings <sjenning@...hat.com>
Cc:	Josh Poimboeuf <jpoimboe@...hat.com>,
	Jiri Kosina <jkosina@...e.cz>,
	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>,
	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: [PATCHv2 2/3] kernel: add support for live patching

On Sun, Nov 16, 2014 at 07:29:23PM -0600, Seth Jennings wrote:
> +#ifdef CONFIG_X86_32
> +int lpc_write_module_reloc(struct module *mod, unsigned long type,
> +			   unsigned long loc, unsigned long value)
> +{
> +	pr_err("Live patching not supported on 32-bit x86\n");
> +	return -ENOSYS;
> +}

Why not just prevent the code from being built on x86_32 instead of
putting this in the file?

thanks,

greg k-h
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