linux-kernel - Re: [PATCH 11/17] x86/kprobes: Make trampoline

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Message-ID: <20190323143518.GB18020@tassilo.jf.intel.com>
Date:   Sat, 23 Mar 2019 07:35:18 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Andi Kleen <andi@...stfloor.org>, x86@...nel.org,
        akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 11/17] x86/kprobes: Make trampoline_handler global and
 visible

On Sat, Mar 23, 2019 at 06:45:21PM +0900, Masami Hiramatsu wrote:
> On Thu, 21 Mar 2019 15:00:03 -0700
> Andi Kleen <andi@...stfloor.org> wrote:
> 
> > From: Andi Kleen <ak@...ux.intel.com>
> > 
> > This function is referenced from assembler, so in LTO
> > it needs to be global and visible to not be optimized away.
> > 
> 
> I got it.
> 
> Acked-by: Masami Hiramatsu <mhiramat@...nel.org>
> 
> Andi, out of curiousity, that is not only for x86, but
> does all arch have to care it?

Yes all architectures need it for LTO, but I currently
only test x86. There are some other people who made it work
on ARM / MIPS / PowerPC before.

-Andi