linux-kernel - Re: parisc build failures in mainline kernel

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Date:   Wed, 3 Nov 2021 21:30:13 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Kees Cook <keescook@...omium.org>,
        Ard Biesheuvel <ardb@...nel.org>, Helge Deller <deller@....de>,
        linux-parisc <linux-parisc@...r.kernel.org>
Subject: Re: parisc build failures in mainline kernel

On 11/3/21 9:18 PM, Linus Torvalds wrote:
> On Wed, Nov 3, 2021 at 8:15 PM Guenter Roeck <linux@...ck-us.net> wrote:
>>
>> the mainline kernel fails to build almost all 'parisc' images.
> 
> All with CONFIG_SMP?
> 
I think so. tinyconfig (SMP=n) builds fine.

> Does this silly patch fix it?
> 

Unfortunately not. With that patch it complains about task_struct.

In file included from arch/parisc/kernel/asm-offsets.c:24:
arch/parisc/kernel/asm-offsets.c: In function 'main':
././include/linux/compiler_types.h:140:41: error: 'struct task_struct' has no member named 'cpu'
   140 | #define __compiler_offsetof(a, b)       __builtin_offsetof(a, b)
       |                                         ^~~~~~~~~~~~~~~~~~
./include/linux/kbuild.h:6:69: note: in definition of macro 'DEFINE'
     6 |         asm volatile("\n.ascii \"->" #sym " %0 " #val "\"" : : "i" (val))
       |                                                                     ^~~
./include/linux/stddef.h:17:33: note: in expansion of macro '__compiler_offsetof'
    17 | #define offsetof(TYPE, MEMBER)  __compiler_offsetof(TYPE, MEMBER)
       |                                 ^~~~~~~~~~~~~~~~~~~
arch/parisc/kernel/asm-offsets.c:43:26: note: in expansion of macro 'offsetof'
    43 |         DEFINE(TASK_CPU, offsetof(struct task_struct, cpu));
       |                          ^~~~~~~~
make[1]: *** [scripts/Makefile.build:121: arch/parisc/kernel/asm-offsets.s] Error 1
make: *** [Makefile:1223: prepare0] Error 2

Guenter