linux-kernel - Re: [PATCH 1/4] objtool: Implement base jump

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Message-ID: <20180115180055.GB2269@hirez.programming.kicks-ass.net>
Date:   Mon, 15 Jan 2018 19:00:55 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        linux-kernel@...r.kernel.org, Dave Hansen <dave.hansen@...el.com>,
        Ashok Raj <ashok.raj@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tim Chen <tim.c.chen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Arjan Van De Ven <arjan.van.de.ven@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Jun Nakajima <jun.nakajima@...el.com>,
        Asit Mallick <asit.k.mallick@...el.com>,
        Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH 1/4] objtool: Implement base jump_assert support

On Mon, Jan 15, 2018 at 11:39:28AM -0600, Josh Poimboeuf wrote:
> Big props to you for braving the bowels of the objtool code.
> 
> On Mon, Jan 15, 2018 at 05:44:29PM +0100, Peter Zijlstra wrote:
> > +static int read_jump_assertions(struct objtool_file *file)
> 
> This does more than just _read_ the assertions.  Can you call it
> something like assert_static_jumps() or do_static_jump_assertions() and
> then call it from the main check() function?

Sure.

> > --- a/tools/objtool/check.h
> > +++ b/tools/objtool/check.h
> > @@ -45,6 +45,7 @@ struct instruction {
> >  	unsigned char type;
> >  	unsigned long immediate;
> >  	bool alt_group, visited, dead_end, ignore, hint, save, restore, ignore_alts;
> > +	bool br_static;
> 
> s/br_static/static_jump_dest/?

fair enough.

> Also, fellow objtool expert, you forgot the patch to the MAINTAINERS
> file ;-)

Well, uhm.. I'll think about it ;-)