linux-kernel - Re: [PATCH v3 22/23] powerpc/vdso: Migrate native signals to generic vdso

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Date:   Thu, 17 Jun 2021 08:36:49 +0200
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Dmitry Safonov <dima@...sta.com>, linux-kernel@...r.kernel.org
Cc:     Dmitry Safonov <0x7f454c46@...il.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Guo Ren <guoren@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
        Ingo Molnar <mingo@...hat.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Will Deacon <will@...nel.org>, x86@...nel.org,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Paul Mackerras <paulus@...ba.org>
Subject: Re: [PATCH v3 22/23] powerpc/vdso: Migrate native signals to generic
 vdso_base



Le 11/06/2021 à 20:02, Dmitry Safonov a écrit :
> Generic way to track the land vma area.
> Stat speaks for itself.
> 
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Cc: Michael Ellerman <mpe@...erman.id.au>
> Cc: Paul Mackerras <paulus@...ba.org>
> Signed-off-by: Dmitry Safonov <dima@...sta.com>


Build failure:

   CC      arch/powerpc/kernel/asm-offsets.s
In file included from ./include/linux/mmzone.h:21,
                  from ./include/linux/gfp.h:6,
                  from ./include/linux/xarray.h:14,
                  from ./include/linux/radix-tree.h:19,
                  from ./include/linux/fs.h:15,
                  from ./include/linux/compat.h:17,
                  from arch/powerpc/kernel/asm-offsets.c:14:
./include/linux/mm_types.h: In function 'init_vdso_base':
./include/linux/mm_types.h:522:28: error: 'TASK_SIZE_MAX' undeclared (first use in this function); 
did you mean 'XATTR_SIZE_MAX'?
   522 | #define UNMAPPED_VDSO_BASE TASK_SIZE_MAX
       |                            ^~~~~~~~~~~~~
./include/linux/mm_types.h:627:40: note: in expansion of macro 'UNMAPPED_VDSO_BASE'
   627 |         mm->vdso_base = (void __user *)UNMAPPED_VDSO_BASE;
       |                                        ^~~~~~~~~~~~~~~~~~
./include/linux/mm_types.h:522:28: note: each undeclared identifier is reported only once for each 
function it appears in
   522 | #define UNMAPPED_VDSO_BASE TASK_SIZE_MAX
       |                            ^~~~~~~~~~~~~
./include/linux/mm_types.h:627:40: note: in expansion of macro 'UNMAPPED_VDSO_BASE'
   627 |         mm->vdso_base = (void __user *)UNMAPPED_VDSO_BASE;
       |                                        ^~~~~~~~~~~~~~~~~~
make[2]: *** [arch/powerpc/kernel/asm-offsets.s] Error 1
make[1]: *** [prepare0] Error 2
make: *** [__sub-make] Error 2