linux-kernel - Re: [PATCH v2] clk: renesas: r9a06g032: Drop _

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Message-ID: <CAMuHMdWJhiO5A7b3B8CH2YpURe_G0dEPEmES6R8n_8D-Z+Q65A@mail.gmail.com>
Date:   Sat, 5 Dec 2020 10:05:29 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Stephen Boyd <sboyd@...nel.org>
Cc:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Michael Ellerman <mpe@...erman.id.au>,
        Michael Turquette <mturquette@...libre.com>,
        Paul Mackerras <paulus@...ba.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Gareth Williams <gareth.williams.jx@...esas.com>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] clk: renesas: r9a06g032: Drop __packed for portability

Hi Stephen,

On Sat, Dec 5, 2020 at 7:24 AM Stephen Boyd <sboyd@...nel.org> wrote:
> Quoting Geert Uytterhoeven (2020-11-30 00:57:43)
> > The R9A06G032 clock driver uses an array of packed structures to reduce
> > kernel size.  However, this array contains pointers, which are no longer
> > aligned naturally, and cannot be relocated on PPC64.  Hence when
> > compile-testing this driver on PPC64 with CONFIG_RELOCATABLE=y (e.g.
> > PowerPC allyesconfig), the following warnings are produced:
> >
> >     WARNING: 136 bad relocations
> >     c000000000616be3 R_PPC64_UADDR64   .rodata+0x00000000000cf338
> >     c000000000616bfe R_PPC64_UADDR64   .rodata+0x00000000000cf370
> >     ...
> >
> > Fix this by dropping the __packed attribute from the r9a06g032_clkdesc
> > definition, trading a small size increase for portability.
> >
> > This increases the 156-entry clock table by 1 byte per entry, but due to
> > the compiler generating more efficient code for unpacked accesses, the
> > net size increase is only 76 bytes (gcc 9.3.0 on arm32).
> >
> > Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
> > Fixes: 4c3d88526eba2143 ("clk: renesas: Renesas R9A06G032 clock driver")
> > Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> > ---
>
> Acked-by: Stephen Boyd <sboyd@...nel.org>
>
> Unless you want me to pick this up for clk-fixes?

Yes please. Forgot to retain this comment for v2:

   "Please take directly (ppc or clk), as this is a build fix.
    https://lore.kernel.org/linux-clk/20201128122819.32187696@canb.auug.org.au/"

Thanks!

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds