linux-kernel - Re: [PATCH 13/27] m68k: Use common bits from generic tlb.h

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Date:	Wed, 14 May 2014 21:26:38 +0200
From:	Richard Weinberger <richard@....at>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
CC:	Linux-Arch <linux-arch@...r.kernel.org>,
	Arnd Bergmann <arnd@...db.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-m68k <linux-m68k@...ts.linux-m68k.org>
Subject: Re: [PATCH 13/27] m68k: Use common bits from generic tlb.h

Am 14.05.2014 21:19, schrieb Geert Uytterhoeven:
> On Wed, May 14, 2014 at 8:59 PM, Richard Weinberger <richard@....at> wrote:
>> --- a/arch/m68k/include/asm/tlb.h
>> +++ b/arch/m68k/include/asm/tlb.h
>> @@ -1,19 +1,11 @@
>>  #ifndef _M68K_TLB_H
>>  #define _M68K_TLB_H
>>
>> -/*
>> - * m68k doesn't need any special per-pte or
>> - * per-vma handling..
>> - */
>> -#define tlb_start_vma(tlb, vma)        do { } while (0)
>> -#define tlb_end_vma(tlb, vma)  do { } while (0)
>> -#define __tlb_remove_tlb_entry(tlb, ptep, address)     do { } while (0)
>> -
>> -/*
>> - * .. because we flush the whole mm when it
>> - * fills up.
>> - */
>> -#define tlb_flush(tlb)         flush_tlb_mm((tlb)->mm)
>> +#ifdef CONFIG_MMU && !defined(CONFIG_COLDFIRE) && !defined(CONFIG_SUN3)
> 
> Syntax error:
> 
> #if defined(CONFIG_MMU) && ...

Whoops, thanks for pointing this out.

> But why this sudden #ifdef checks?

They are needed because in pgalloc.h you have:
#ifdef CONFIG_MMU
#include <asm/virtconvert.h>
#if defined(CONFIG_COLDFIRE)
#include <asm/mcf_pgalloc.h>
#elif defined(CONFIG_SUN3)
#include <asm/sun3_pgalloc.h>
#else
#include <asm/motorola_pgalloc.h>
#endif

And only asm/motorola_pgalloc.h have __pte/pmd_free_tlb as static inline functions.
Therefore we need to define them such that the generic tlb.h versions will not clash
with yours.

Thanks,
//richard
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