linux-kernel - Re: linux-next: build failure after merge of the akpm tree

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Date:   Thu, 27 Feb 2020 10:02:59 +0100
From:   Geert Uytterhoeven <geert@...ux-m68k.org>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Arjun Roy <arjunroy@...gle.com>,
        David Miller <davem@...emloft.net>
Subject: Re: linux-next: build failure after merge of the akpm tree

Hi Stephen et al,

On Thu, Feb 27, 2020 at 5:12 AM Stephen Rothwell <sfr@...b.auug.org.au> wrote:
> After merging the akpm tree, today's linux-next build (sparc defconfig)
> failed like this:
>
> In file included from include/linux/list.h:9:0,
>                  from include/linux/smp.h:12,
>                  from include/linux/kernel_stat.h:5,
>                  from mm/memory.c:42:
> mm/memory.c: In function 'insert_pages':
> mm/memory.c:1523:41: error: implicit declaration of function 'pte_index'; did you mean 'page_index'? [-Werror=implicit-function-declaration]
>    remaining_pages_total, PTRS_PER_PTE - pte_index(addr));
>                                          ^
> include/linux/kernel.h:842:40: note: in definition of macro '__typecheck'
>    (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
>                                         ^
> include/linux/kernel.h:866:24: note: in expansion of macro '__safe_cmp'
>   __builtin_choose_expr(__safe_cmp(x, y), \
>                         ^~~~~~~~~~
> include/linux/kernel.h:934:27: note: in expansion of macro '__careful_cmp'
>  #define min_t(type, x, y) __careful_cmp((type)(x), (type)(y), <)
>                            ^~~~~~~~~~~~~
> mm/memory.c:1522:26: note: in expansion of macro 'min_t'
>   pages_to_write_in_pmd = min_t(unsigned long,
>                           ^~~~~

Same issue on m68k, as per a report from kisskb.

> Caused by patch
>
>   "mm/memory.c: add vm_insert_pages()"
>
> sparc32 does not implement pte_index at all :-(

Seems like about only half of the architectures do.

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