linux-kernel - Re: [PATCH 23/27] sparc: Use common bits from generic tlb.h

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Message-ID: <5373CC59.8070702@nod.at>
Date:	Wed, 14 May 2014 22:04:41 +0200
From:	Richard Weinberger <richard@....at>
To:	Sam Ravnborg <sam@...nborg.org>
CC:	linux-arch@...r.kernel.org, arnd@...db.de,
	linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>, sparclinux@...r.kernel.org
Subject: Re: [PATCH 23/27] sparc: Use common bits from generic tlb.h

Am 14.05.2014 21:55, schrieb Sam Ravnborg:
> On Wed, May 14, 2014 at 08:59:55PM +0200, Richard Weinberger wrote:
>> It is no longer needed to define them on our own.
>>
>> Cc: "David S. Miller" <davem@...emloft.net>
>> Cc: Richard Weinberger <richard@....at>
>> Cc: sparclinux@...r.kernel.org
>> Cc: linux-kernel@...r.kernel.org
>> Signed-off-by: Richard Weinberger <richard@....at>
>> ---
>>  arch/sparc/include/asm/tlb_32.h | 8 --------
>>  arch/sparc/include/asm/tlb_64.h | 3 ---
>>  2 files changed, 11 deletions(-)
>>
>> diff --git a/arch/sparc/include/asm/tlb_32.h b/arch/sparc/include/asm/tlb_32.h
>> index 6d02d1c..60641a1 100644
>> --- a/arch/sparc/include/asm/tlb_32.h
>> +++ b/arch/sparc/include/asm/tlb_32.h
>> @@ -11,14 +11,6 @@ do {								\
>>  	flush_tlb_range(vma, vma->vm_start, vma->vm_end);	\
>>  } while (0)
>>  
>> -#define __tlb_remove_tlb_entry(tlb, pte, address) \
>> -	do { } while (0)
>> -
>> -#define tlb_flush(tlb) \
>> -do {								\
>> -	flush_tlb_mm((tlb)->mm);				\
>> -} while (0)
>> -
>>  #include <asm-generic/tlb.h>
>>  
>>  #endif /* _SPARC_TLB_H */
> 
> This part looks OK.
> 
>> diff --git a/arch/sparc/include/asm/tlb_64.h b/arch/sparc/include/asm/tlb_64.h
>> index 190e189..36fdcec 100644
>> --- a/arch/sparc/include/asm/tlb_64.h
>> +++ b/arch/sparc/include/asm/tlb_64.h
>> @@ -22,9 +22,6 @@ extern void smp_flush_tlb_mm(struct mm_struct *mm);
>>  extern void __flush_tlb_pending(unsigned long, unsigned long, unsigned long *);
>>  extern void flush_tlb_pending(void);
>>  
>> -#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)
>>  #define tlb_flush(tlb)	flush_tlb_pending()
>>  
>>  #include <asm-generic/tlb.h>
> 
> This does not fly for sparc64.
> __pte_free_tlb is a static inline in pgalloc_64.h so no
> define exist to teach tlb.h that an arch override exist.

Okay, we need a #define __pte_free_tlb __pte_free_tlb.

> Likewise for __pmd_free_tlb

__pmd_free_tlb is already a macro so the generic tlb.h should handle it correctly.

#define __pmd_free_tlb(tlb, pmd, addr)                \
        pgtable_free_tlb(tlb, pmd, false)

I'd move both __pmd_free_tlb and __pte_free_tlb into tlb.h such that the include order
of tlb.h vs pgalloc.h does not matter.
Are you fine with that?

Thanks,
//richard
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