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

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Date:	Tue, 18 Nov 2014 15:11:43 +0100 (CET)
From:	Miroslav Benes <mbenes@...e.cz>
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>,
	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: [PATCHv2 2/3] kernel: add support for live patching


Hi,

thank you for the revision. I'll rebase our patches on top of that. Anyway 
there is a small bug in a header file. See below.

On Sun, 16 Nov 2014, Seth Jennings wrote:

[...]

> diff --git a/arch/x86/include/asm/livepatch.h 
b/arch/x86/include/asm/livepatch.h
> new file mode 100644
> index 0000000..c5fab45
> --- /dev/null
> +++ b/arch/x86/include/asm/livepatch.h
> @@ -0,0 +1,38 @@
> +/*
> + * livepatch.h - x86-specific Live Kernel Patching Core
> + *
> + * Copyright (C) 2014 Seth Jennings <sjenning@...hat.com>
> + *
> + * This program is free software; you can redistribute it and/or
> + * modify it under the terms of the GNU General Public License
> + * as published by the Free Software Foundation; either version 2
> + * of the License, or (at your option) any later version.
> + *
> + * This program is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with this program; if not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#ifndef _ASM_X86_LIVEPATCH_H
> +#define _ASM_X86_LIVEPATCH_H
> +
> +#include <linux/module.h>
> +
> +#ifdef CONFIG_LIVE_PATCHING
> +extern int lpc_write_module_reloc(struct module *mod, unsigned long 
type,
> +                               unsigned long loc, unsigned long value);
> +
> +#else
> +static int lpc_write_module_reloc(struct module *mod, unsigned long 
type,
> +                               unsigned long loc, unsigned long value);
> +{
> +     pr_err("Kernel does not support live patching\n");
> +     return -ENOSYS;
> +}
> +#endif
> +
> +#endif /* _ASM_X86_LIVEPATCH_H */

There should not be a semicolon at the end of the function header in #else 
branch.

Regards,

---
Miroslav Benes
SUSE Labs
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