linux-kernel - Re: [PATCH] arc: remove #ifndef CONFIG_AS_CFI_SIGNAL

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Message-ID: <CAK7LNAR1jK_O2=LSeunFiMO26F1SGR3ga1gUAi6hcxXuiWaxDA@mail.gmail.com>
Date:   Mon, 13 Apr 2020 15:01:46 +0900
From:   Masahiro Yamada <masahiroy@...nel.org>
To:     Vineet Gupta <Vineet.Gupta1@...opsys.com>
Cc:     "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>,
        Kate Stewart <kstewart@...uxfoundation.org>,
        Kees Cook <keescook@...omium.org>,
        Arnd Bergmann <arnd@...db.de>,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>,
        Pankaj Bharadiya <pankaj.laxminarayan.bharadiya@...el.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Allison Randal <allison@...utok.net>
Subject: Re: [PATCH] arc: remove #ifndef CONFIG_AS_CFI_SIGNAL_FRAME

On Mon, Apr 13, 2020 at 2:38 PM Vineet Gupta <Vineet.Gupta1@...opsys.com> wrote:
>
> On 4/12/20 7:05 PM, Masahiro Yamada wrote:
> > CONFIG_AS_CFI_SIGNAL_FRAME is never defined for ARC.
> >
> > Suggested-by: Nick Desaulniers <ndesaulniers@...gle.com>
>
> Where, how ?

I was working on various cleanups of x86 CONFIG_AS_* macros.

https://lore.kernel.org/patchwork/patch/1214512/

I removed CONFIG_AS_CFI_SIGNAL_FRAME from x86.

Nick pointed out the same name macro used in ARC,
which is not defined anywhere.

> > Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> > ---
> >
> >  arch/arc/kernel/unwind.c | 2 --
> >  1 file changed, 2 deletions(-)
> >
> > diff --git a/arch/arc/kernel/unwind.c b/arch/arc/kernel/unwind.c
> > index 27ea64b1fa33..f87758a6851b 100644
> > --- a/arch/arc/kernel/unwind.c
> > +++ b/arch/arc/kernel/unwind.c
> > @@ -1178,11 +1178,9 @@ int arc_unwind(struct unwind_frame_info *frame)
> >  #endif
> >
> >       /* update frame */
> > -#ifndef CONFIG_AS_CFI_SIGNAL_FRAME
> >       if (frame->call_frame
> >           && !UNW_DEFAULT_RA(state.regs[retAddrReg], state.dataAlign))
> >               frame->call_frame = 0;
> > -#endif
> >       cfa = FRAME_REG(state.cfa.reg, unsigned long) + state.cfa.offs;
> >       startLoc = min_t(unsigned long, UNW_SP(frame), cfa);
> >       endLoc = max_t(unsigned long, UNW_SP(frame), cfa);
>
> Actually there's more scope for cleanup here. The while signal frame stuff is not
> relevant here at all as this is only kernel stack frames. So all of
> frame->call_frame stuff is bogus at best.
>
> I once had an branch with ~15 patches to clean this all up. Let me go find it.

I am not familiar with ARC code.

So, I leave this up to you for further cleanups.

>
> Curious though about the CC list, is this patch part of a bigger series or some
> such. So many people from all over suddenly interested in ARC ;-)

Presumably, they touched this file in the past,
and scripts/get_maintainers.pl picked them up.

masahiro@...ar:~/ref/linux$ scripts/get_maintainer.pl  -f
arch/arc/kernel/unwind.c
Vineet Gupta <vgupta@...opsys.com> (supporter:SYNOPSYS ARC
ARCHITECTURE,commit_signer:2/5=40%)
Kees Cook <keescook@...omium.org> (commit_signer:2/5=40%)
"Gustavo A. R. Silva" <gustavo@...eddedor.com>
(commit_signer:2/5=40%,authored:2/5=40%,added_lines:3/11=27%,removed_lines:2/14=14%)
Enrico Weigelt <info@...ux.net> (commit_signer:1/5=20%)
Greg Kroah-Hartman <gregkh@...uxfoundation.org> (commit_signer:1/5=20%)
Thomas Gleixner <tglx@...utronix.de>
(authored:1/5=20%,added_lines:1/11=9%,removed_lines:4/14=29%)
Pankaj Bharadiya <pankaj.laxminarayan.bharadiya@...el.com>
(authored:1/5=20%,added_lines:3/11=27%,removed_lines:3/14=21%)
Arnd Bergmann <arnd@...db.de>
(authored:1/5=20%,added_lines:4/11=36%,removed_lines:5/14=36%)
linux-snps-arc@...ts.infradead.org (open list:SYNOPSYS ARC ARCHITECTURE)
linux-kernel@...r.kernel.org (open list)

> -Vineet

-- 
Best Regards
Masahiro Yamada