linux-kernel - Re: [PATCH] powerpc: fix the allyesconfig build

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Message-ID: <CAMuHMdVJKarCRRRJq_hmvvv0NcSpREdqDbH8L5NitZmFUEbqmw@mail.gmail.com>
Date:   Mon, 30 Nov 2020 09:58:23 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        PowerPC <linuxppc-dev@...ts.ozlabs.org>,
        Nicholas Piggin <npiggin@...il.com>,
        Daniel Axtens <dja@...ens.net>, Joel Stanley <joel@....id.au>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Yisen Zhuang <yisen.zhuang@...wei.com>,
        Salil Mehta <salil.mehta@...wei.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Linux-Renesas <linux-renesas-soc@...r.kernel.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>
Subject: Re: [PATCH] powerpc: fix the allyesconfig build

Hi Stephen,

On Sat, Nov 28, 2020 at 2:28 AM Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> There are 2 drivers that have arrays of packed structures that contain
> pointers that end up at unaligned offsets.  These produce warnings in
> the PowerPC allyesconfig build like this:
>
> WARNING: 148 bad relocations
> c00000000e56510b R_PPC64_UADDR64   .rodata+0x0000000001c72378
> c00000000e565126 R_PPC64_UADDR64   .rodata+0x0000000001c723c0
>
> They are not drivers that are used on PowerPC (I assume), so mark them
> to not be built on PPC64 when CONFIG_RELOCATABLE is enabled.
>
> Cc: Geert Uytterhoeven <geert+renesas@...der.be>
> Cc: Michael Turquette <mturquette@...libre.com>
> Cc: Stephen Boyd <sboyd@...nel.org>
> Cc: Yisen Zhuang <yisen.zhuang@...wei.com>
> Cc: Salil Mehta <salil.mehta@...wei.com>
> Cc: David S. Miller <davem@...emloft.net>
> Cc: Jakub Kicinski <kuba@...nel.org>
> Cc: Nicholas Piggin  <npiggin@...il.com>
> Cc: Daniel Axtens <dja@...ens.net>
> Cc: Joel Stanley <joel@....id.au>
> Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>

Thanks for your patch!

> --- a/drivers/clk/renesas/Kconfig
> +++ b/drivers/clk/renesas/Kconfig
> @@ -151,6 +151,10 @@ config CLK_R8A779A0
>         select CLK_RENESAS_CPG_MSSR
>
>  config CLK_R9A06G032
> +       # PPC64 RELOCATABLE kernels cannot handle relocations to
> +       # unaligned locations that are produced by the array of
> +       # packed structures in this driver.
> +       depends on !(PPC64 && RELOCATABLE)
>         bool "Renesas R9A06G032 clock driver"
>         help
>           This is a driver for R9A06G032 clocks

I prefer to fix this in the driver instead.  The space saving by packing the
structure is minimal.
I've sent a patch
https://lore.kernel.org/r/20201130085743.1656317-1-geert+renesas@glider.be
(when lore is back)

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