linux-kernel - Re: [PATCH v2 02/17] vdso: Clean header inclusion in getrandom

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Message-ID: <7e519ba2-0293-4320-84bf-44f930fc286d@csgroup.eu>
Date: Mon, 26 Aug 2024 10:37:49 +0200
From: Christophe Leroy <christophe.leroy@...roup.eu>
To: "Jason A. Donenfeld" <Jason@...c4.com>
Cc: Michael Ellerman <mpe@...erman.id.au>, Nicholas Piggin
 <npiggin@...il.com>, Naveen N Rao <naveen@...nel.org>,
 Andy Lutomirski <luto@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
 Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
 Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
 "H. Peter Anvin" <hpa@...or.com>, Theodore Ts'o <tytso@....edu>,
 Arnd Bergmann <arnd@...db.de>, Andrew Morton <akpm@...ux-foundation.org>,
 Steven Rostedt <rostedt@...dmis.org>, Masami Hiramatsu
 <mhiramat@...nel.org>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Vincenzo Frascino <vincenzo.frascino@....com>, Shuah Khan
 <shuah@...nel.org>, linuxppc-dev@...ts.ozlabs.org,
 linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
 linux-arch@...r.kernel.org, linux-mm@...ck.org,
 linux-trace-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org
Subject: Re: [PATCH v2 02/17] vdso: Clean header inclusion in getrandom

Le 26/08/2024 à 10:07, Jason A. Donenfeld a écrit :
> On Thu, Aug 22, 2024 at 09:13:10AM +0200, Christophe Leroy wrote:
>>   
>> +#define _PAGE_SIZE (1UL << CONFIG_PAGE_SHIFT)
>> +#define _PAGE_MASK (~(_PAGE_SIZE - 1))
> 
> If PAGE_SIZE isn't defined at this point, why not just call it PAGE_SIZE
> instead of _PAGE_SIZE? But if that's the case, why not put the vdso
> definition of PAGE_SIZE into some vdso header included by this file?

It was working ok on powerpc but on x86 I got:

   CC      arch/x86/entry/vdso/vgetrandom.o
In file included from arch/x86/entry/vdso/vgetrandom.c:7:
arch/x86/entry/vdso/../../../../lib/vdso/getrandom.c:24: error: 
"PAGE_SIZE" redefined [-Werror]
    24 | #define PAGE_SIZE (1UL << CONFIG_PAGE_SHIFT)
       |
In file included from ./arch/x86/include/asm/page.h:9,
                  from ./arch/x86/include/asm/thread_info.h:12,
                  from ./include/linux/thread_info.h:60,
                  from ./include/linux/smp.h:118,
                  from ./include/linux/alloc_tag.h:14,
                  from ./include/linux/percpu.h:5,
                  from ./arch/x86/include/asm/msr.h:15,
                  from ./arch/x86/include/asm/vdso/gettimeofday.h:19,
                  from ./include/vdso/datapage.h:164,
                  from 
arch/x86/entry/vdso/../../../../lib/vdso/getrandom.c:7,
                  from arch/x86/entry/vdso/vgetrandom.c:7:
./arch/x86/include/asm/page_types.h:11: note: this is the location of 
the previous definition
    11 | #define PAGE_SIZE  (_AC(1,UL) << PAGE_SHIFT)
       |
In file included from arch/x86/entry/vdso/vgetrandom.c:7:
arch/x86/entry/vdso/../../../../lib/vdso/getrandom.c:25: error: 
"PAGE_MASK" redefined [-Werror]
    25 | #define PAGE_MASK (~(PAGE_SIZE - 1))
       |
In file included from ./arch/x86/include/asm/page.h:9,
                  from ./arch/x86/include/asm/thread_info.h:12,
                  from ./include/linux/thread_info.h:60,
                  from ./include/linux/smp.h:118,
                  from ./include/linux/alloc_tag.h:14,
                  from ./include/linux/percpu.h:5,
                  from ./arch/x86/include/asm/msr.h:15,
                  from ./arch/x86/include/asm/vdso/gettimeofday.h:19,
                  from ./include/vdso/datapage.h:164,
                  from 
arch/x86/entry/vdso/../../../../lib/vdso/getrandom.c:7,
                  from arch/x86/entry/vdso/vgetrandom.c:7:
./arch/x86/include/asm/page_types.h:12: note: this is the location of 
the previous definition
    12 | #define PAGE_MASK  (~(PAGE_SIZE-1))
       |
cc1: all warnings being treated as errors

Christophe