linux-kernel - Re: [PATCH 4/9] m68k: remove support for DISCONTIGMEM

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Date:   Wed, 2 Jun 2021 13:25:24 +0200
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Mike Rapoport <rppt@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Jonathan Corbet <corbet@....net>,
        Matt Turner <mattst88@...il.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Richard Henderson <rth@...ddle.net>,
        Vineet Gupta <vgupta@...opsys.com>, kexec@...ts.infradead.org,
        alpha <linux-alpha@...r.kernel.org>,
        Linux-Arch <linux-arch@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        "linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-m68k <linux-m68k@...ts.linux-m68k.org>,
        "open list:BROADCOM NVRAM DRIVER" <linux-mips@...r.kernel.org>,
        Linux MM <linux-mm@...ck.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        linux-s390 <linux-s390@...r.kernel.org>,
        Linux-sh list <linux-sh@...r.kernel.org>,
        arcml <linux-snps-arc@...ts.infradead.org>,
        "open list:TENSILICA XTENSA PORT (xtensa)" 
        <linux-xtensa@...ux-xtensa.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        sparclinux <sparclinux@...r.kernel.org>
Subject: Re: [PATCH 4/9] m68k: remove support for DISCONTIGMEM

Hi Mike,

On Wed, Jun 2, 2021 at 12:54 PM Mike Rapoport <rppt@...nel.org> wrote:
> From: Mike Rapoport <rppt@...ux.ibm.com>
>
> DISCONTIGMEM was replaced by FLATMEM with freeing of the unused memory map
> in v5.11.
>
> Remove the support for DISCONTIGMEM entirely.
>
> Signed-off-by: Mike Rapoport <rppt@...ux.ibm.com>

Thanks for your patch!

Reviewed-by: Geert Uytterhoeven <geert@...ux-m68k.org>
Acked-by: Geert Uytterhoeven <geert@...ux-m68k.org>

> --- a/arch/m68k/include/asm/page_mm.h
> +++ b/arch/m68k/include/asm/page_mm.h
> @@ -126,25 +126,7 @@ static inline void *__va(unsigned long x)
>
>  extern int m68k_virt_to_node_shift;
>
> -#ifndef CONFIG_DISCONTIGMEM
>  #define __virt_to_node(addr)   (&pg_data_map[0])

With pg_data_map[] removed, this definition can go as well.
Seems to be a leftover from 1008a11590b966b4 ("m68k: switch to MEMBLOCK
 + NO_BOOTMEM")

There are a few more:
arch/m68k/include/asm/mmzone.h:extern pg_data_t pg_data_map[];
arch/m68k/include/asm/mmzone.h:#define NODE_DATA(nid)
(&pg_data_map[nid])

> -#else
> -extern struct pglist_data *pg_data_table[];
> -
> -static inline __attribute_const__ int __virt_to_node_shift(void)
> -{
> -       int shift;
> -
> -       asm (
> -               "1:     moveq   #0,%0\n"
> -               m68k_fixup(%c1, 1b)
> -               : "=d" (shift)
> -               : "i" (m68k_fixup_vnode_shift));
> -       return shift;
> -}
> -
> -#define __virt_to_node(addr)   (pg_data_table[(unsigned long)(addr) >> __virt_to_node_shift()])
> -#endif

> --- a/arch/m68k/mm/init.c
> +++ b/arch/m68k/mm/init.c
> @@ -44,28 +44,8 @@ EXPORT_SYMBOL(empty_zero_page);
>
>  int m68k_virt_to_node_shift;
>
> -#ifdef CONFIG_DISCONTIGMEM
> -pg_data_t pg_data_map[MAX_NUMNODES];
> -EXPORT_SYMBOL(pg_data_map);
> -
> -pg_data_t *pg_data_table[65];
> -EXPORT_SYMBOL(pg_data_table);
> -#endif
> -

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