linux-kernel - Re: [PATCH v2 3/4] x86/static_call: Add out-of-line static call implementation

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Message-ID: <20181126111920.15f547f1@gandalf.local.home>
Date:   Mon, 26 Nov 2018 11:19:20 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Jason Baron <jbaron@...mai.com>, Jiri Kosina <jkosina@...e.cz>,
        David Laight <David.Laight@...LAB.COM>,
        Borislav Petkov <bp@...en8.de>,
        Julia Cartwright <julia@...com>, Jessica Yu <jeyu@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH v2 3/4] x86/static_call: Add out-of-line static call
 implementation

On Mon, 26 Nov 2018 16:43:56 +0100
Peter Zijlstra <peterz@...radead.org> wrote:


> > +	/* Patch the call site: */
> > +	text_poke_bp((void *)insn, opcodes, CALL_INSN_SIZE,
> > +		     static_call_bp_handler);  
> 
> I'm confused by the whole static_call_bp_handler thing; why not jump
> straight to @func ?

Interesting, that might work. I can give it a try.

-- Steve