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

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Message-ID: <5373D1B4.5040505@nod.at>
Date:	Wed, 14 May 2014 22:27:32 +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 22:22, schrieb Sam Ravnborg:
> On Wed, May 14, 2014 at 10:04:41PM +0200, Richard Weinberger wrote:
>> 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?
> Yes, as long as sparc64 continue to build it makes good sense
> to define these in the same file as done by most other architectures.
> 
> 	Sam

Will do.
Sadly also with my (broken) patch sparc64 builds fine.

Is there an easy way to boot a sparc64 Linux within qemu?

Thanks,
//richard
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