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

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Message-ID: <537430F4.6020004@roeck-us.net>
Date:	Wed, 14 May 2014 20:13:56 -0700
From:	Guenter Roeck <linux@...ck-us.net>
To:	Richard Weinberger <richard@....at>,
	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

On 05/14/2014 01:27 PM, Richard Weinberger wrote:
> 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?
>

Try rootfs/sparc64 from https://github.com/groeck/linux-build-test.git

Guenter

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