linux-kernel - Re: [PATCH 3/3 v6] livepatch: Use the default ftrace_ops instead of REGS when ARGS is available

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Message-ID: <20201113081006.00c350c7@oasis.local.home>
Date:   Fri, 13 Nov 2020 08:10:06 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Miroslav Benes <mbenes@...e.cz>
Cc:     linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Jiri Kosina <jikos@...nel.org>, live-patching@...r.kernel.org
Subject: Re: [PATCH 3/3 v6] livepatch: Use the default ftrace_ops instead of
 REGS when ARGS is available

On Fri, 13 Nov 2020 12:31:11 +0100 (CET)
Miroslav Benes <mbenes@...e.cz> wrote:

> > +++ b/arch/x86/include/asm/livepatch.h
> > @@ -12,9 +12,9 @@
> >  #include <asm/setup.h>
> >  #include <linux/ftrace.h>
> >  
> > -static inline void klp_arch_set_pc(struct pt_regs *regs, unsigned long ip)
> > +static inline void klp_arch_set_pc(struct ftrace_regs *fregs, unsigned long ip)
> >  {
> > -	regs->ip = ip;
> > +	ftrace_regs_set_ip(fregs, ip);  
> 
> You forgot to update the call site :)

Bah. This would have been caught via my full test suite, but I only ran
the cross compiling tests :-P

Thanks, will fix in v7.

-- Steve