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Subject: Re: [PATCH v3 22/23] powerpc/vdso: Migrate native signals to generic
 vdso_base
To:     Dmitry Safonov <dima@arista.com>, linux-kernel@vger.kernel.org
Cc:     Dmitry Safonov <0x7f454c46@gmail.com>,
        Alexander Viro <viro@zeniv.linux.org.uk>,
        Andrew Morton <akpm@linux-foundation.org>,
        Andy Lutomirski <luto@kernel.org>,
        Arnd Bergmann <arnd@arndb.de>, Borislav Petkov <bp@alien8.de>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Guo Ren <guoren@kernel.org>, "H. Peter Anvin" <hpa@zytor.com>,
        Ingo Molnar <mingo@redhat.com>,
        Oleg Nesterov <oleg@redhat.com>,
        Russell King <linux@armlinux.org.uk>,
        Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
        Thomas Gleixner <tglx@linutronix.de>,
        Vincenzo Frascino <vincenzo.frascino@arm.com>,
        Will Deacon <will@kernel.org>, x86@kernel.org,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Paul Mackerras <paulus@samba.org>
References: <20210611180242.711399-1-dima@arista.com>
 <20210611180242.711399-23-dima@arista.com>
From:   Christophe Leroy <christophe.leroy@csgroup.eu>
Message-ID: <1678c131-98e3-2d5c-7cf1-0dcb985d67bb@csgroup.eu>
Date:   Thu, 17 Jun 2021 08:36:49 +0200
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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@kernel.crashing.org>
> Cc: Michael Ellerman <mpe@ellerman.id.au>
> Cc: Paul Mackerras <paulus@samba.org>
> Signed-off-by: Dmitry Safonov <dima@arista.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