linux-kernel - Re: [PATCH 16/27] mips: Use common bits from generic tlb.h

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Date:	Thu, 15 May 2014 11:02:17 -0700
From:	Leonid Yegoshin <Leonid.Yegoshin@...tec.com>
To:	Richard Weinberger <richard@....at>
CC:	<linux-arch@...r.kernel.org>, <arnd@...db.de>,
	<linux-kernel@...r.kernel.org>, Ralf Baechle <ralf@...ux-mips.org>,
	"John Crispin" <blogic@...nwrt.org>,
	Markos Chandras <markos.chandras@...tec.com>,
	<linux-mips@...ux-mips.org>
Subject: Re: [PATCH 16/27] mips: Use common bits from generic tlb.h

On 05/14/2014 11:59 AM, Richard Weinberger wrote:
> It is no longer needed to define them on our own.
>
> Cc: Ralf Baechle <ralf@...ux-mips.org>
> Cc: John Crispin <blogic@...nwrt.org>
> Cc: Markos Chandras <markos.chandras@...tec.com>
> Cc: Leonid Yegoshin <Leonid.Yegoshin@...tec.com>
> Cc: Richard Weinberger <richard@....at>
> Cc: linux-mips@...ux-mips.org
> Cc: linux-kernel@...r.kernel.org
> Signed-off-by: Richard Weinberger <richard@....at>
> ---
>   arch/mips/include/asm/tlb.h | 7 -------
>   1 file changed, 7 deletions(-)
>
> diff --git a/arch/mips/include/asm/tlb.h b/arch/mips/include/asm/tlb.h
> index 4a23493..5ea43ca 100644
> --- a/arch/mips/include/asm/tlb.h
> +++ b/arch/mips/include/asm/tlb.h
> @@ -10,13 +10,6 @@
>   		if (!tlb->fullmm)				\
>   			flush_cache_range(vma, vma->vm_start, vma->vm_end); \
>   	}  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)
>   
>   #define UNIQUE_ENTRYHI(idx)						\
>   		((CKSEG0 + ((idx) << (PAGE_SHIFT + 1))) |		\

I would like to know why these functions are eliminated (don't find any 
clue).
Is it just because there will be a generic one or the calls would be 
eliminated?
And if there are generic - can I tune it later?

Explanation of Q:  MIPS R6 architecture has now TLBINV instruction which 
eliminates TLB elements only for specific ASID (read here - "mm_struct") 
and I would like to use it for efficiency in tlb_flush()/flush_tlb_mm.
(Not sure about tlb_end_vma()/ __tlb_remove_tlb_entry() yet)

- Leonid.
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