linux-kernel - Re: [PATCH 1/3] x86/alternatives: Teach text_poke

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Date:   Mon, 7 Oct 2019 10:05:27 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        Nadav Amit <nadav.amit@...il.com>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Song Liu <songliubraving@...com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Daniel Bristot de Oliveira <bristot@...hat.com>
Subject: Re: [PATCH 1/3] x86/alternatives: Teach text_poke_bp() to emulate
 instructions

On Fri, Oct 04, 2019 at 10:45:40PM +0900, Masami Hiramatsu wrote:
> Hi Peter,
> 
> On Thu, 3 Oct 2019 13:01:06 +0200
> Peter Zijlstra <peterz@...radead.org> wrote:

> > > I'm halfway through a patch introducing:
> > > 
> > >   union text_poke_insn {
> > > 	u8 code[POKE_MAX_OPCODE_SUZE];
> > > 	struct {
> > > 		u8 opcode;
> > > 		s32 disp;
> > > 	} __attribute__((packed));
> > >   };
> > > 
> > > to text-patching.h to unify all such custom unions we have all over the
> > > place. I'll mob up the above in that.
> 
> I think it is good to unify such unions, but I meant above was, it was
> also important to unify the opcode macro. Since poke_int3_handler()
> clasifies the opcode by your *_INSN_OPCODE macro, it is natual to use
> those opcode for text_poke_bp() interface.

Right, but I think we should do that as another patch, there's a lot of
instances in that file and just changing one or two over is 'weird'.

I can put it on the todo to fix that all up.