linux-kernel - Re: [PATCH 1/2 v3] x86: introduce int3-based instruction patching

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Message-ID: <1373583689.2614.4.camel@joe-AO722>
Date:	Thu, 11 Jul 2013 16:01:29 -0700
From:	Joe Perches <joe@...ches.com>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Jason Baron <jbaron@...mai.com>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Borislav Petkov <bp@...en8.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2 v3] x86: introduce int3-based instruction patching

On Thu, 2013-07-11 at 22:26 +0200, Jiri Kosina wrote:
> Introduce a method for run-time instrucntion patching on a live SMP kernel 

Some of the typos anyway.

s/instrunction/instruction

[]

> v2 -> v3:
>   + fixed few typos (Joe Perches)
[]
> +       /* we are not interested in non-int3 faults and ring > 0 faults */
> +       if (val != DIE_INT3 || !args->regs || user_mode_vm(args->regs)
> +                           || (unsigned long) bp_int3_addr != args->regs->ip)
> +               return NOTIFY_DONE;
> +
> +       /* set up the specified breakpoint handler */
> +       args->regs->ip = (unsigned long) bp_int3_handler;

Still think the test and set should be in the same order.

> +/*
> + * text_poke_bp() -- update instructions on live kernel on SMP
> + * @addr:      address to patch
> + * @opcode:    opcode of new instruction
> + * @len:       length to copy
> + * @handler:   address to jump to when the temporary breakpoint is hit
> + *

This sure looks like kernel-doc but misses the leading /**



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