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From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Scott Wood <scottwood@freescale.com>
Cc: linuxppc-dev@lists.ozlabs.org, David Gibson <dwg@au1.ibm.com>
Subject: Re: [PATCH 5/7] powerpc/mm: 64-bit: don't handle non-standard page sizes
Date: Thu, 19 May 2011 07:36:04 +1000	[thread overview]
Message-ID: <1305754564.7481.4.camel@pasglop> (raw)
In-Reply-To: <20110518210535.GD29524@schlenkerla.am.freescale.net>

On Wed, 2011-05-18 at 16:05 -0500, Scott Wood wrote:
> I don't see where any non-standard page size will be set in the
> kernel page tables, so don't waste time checking for it.  It wouldn't
> work with TLB0 on an FSL MMU anyway, so if there's something I missed
> (or which is out-of-tree), it's relying on implementation-specific
> behavior.  If there's an out-of-tree need for occasional 4K mappings
> with CONFIG_PPC_64K_PAGES, perhaps this check could only be done when
> that is defined.
> 
> Signed-off-by: Scott Wood <scottwood@freescale.com>
> ---

Do you use that in the hugetlbfs code ? Can you publish that code ? It's
long overdue...

Cheers,
Ben.

>  arch/powerpc/mm/tlb_low_64e.S |   13 -------------
>  1 files changed, 0 insertions(+), 13 deletions(-)
> 
> diff --git a/arch/powerpc/mm/tlb_low_64e.S b/arch/powerpc/mm/tlb_low_64e.S
> index 922fece..e782023 100644
> --- a/arch/powerpc/mm/tlb_low_64e.S
> +++ b/arch/powerpc/mm/tlb_low_64e.S
> @@ -232,19 +232,6 @@ finish_normal_tlb_miss:
>  	rlwimi	r11,r14,32-19,27,31	/* Insert WIMGE */
>  	mtspr	SPRN_MAS2,r11
>  
> -	/* Check page size, if not standard, update MAS1 */
> -	rldicl	r11,r14,64-8,64-8
> -#ifdef CONFIG_PPC_64K_PAGES
> -	cmpldi	cr0,r11,BOOK3E_PAGESZ_64K
> -#else
> -	cmpldi	cr0,r11,BOOK3E_PAGESZ_4K
> -#endif
> -	beq-	1f
> -	mfspr	r11,SPRN_MAS1
> -	rlwimi	r11,r14,31,21,24
> -	rlwinm	r11,r11,0,21,19
> -	mtspr	SPRN_MAS1,r11
> -1:
>  	/* Move RPN in position */
>  	rldicr	r11,r14,64-(PTE_RPN_SHIFT-PAGE_SHIFT),63-PAGE_SHIFT
>  	clrldi	r15,r11,12		/* Clear crap at the top */

  reply	other threads:[~2011-05-18 21:36 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-05-18 21:04 [PATCH 1/7] powerpc/mm: 64-bit 4k: use page-sized PMDs Scott Wood
2011-05-18 21:05 ` [PATCH 2/7] powerpc/mm: 64-bit 4k: use a PMD-based virtual page table Scott Wood
2011-05-18 21:33   ` Benjamin Herrenschmidt
2011-05-20 20:57     ` Scott Wood
2011-05-20 22:15       ` Benjamin Herrenschmidt
2011-05-23 18:54         ` Scott Wood
2011-05-23 20:51           ` Benjamin Herrenschmidt
2011-05-23 23:31             ` Scott Wood
2011-05-24  2:52               ` Benjamin Herrenschmidt
2011-05-18 21:05 ` [PATCH 3/7] powerpc/mm: 64-bit tlb miss: get PACA from memory rather than SPR Scott Wood
2011-05-18 21:05 ` [PATCH 4/7] powerpc/mm: 64-bit: Don't load PACA in normal TLB miss exceptions Scott Wood
2011-05-18 21:05 ` [PATCH 5/7] powerpc/mm: 64-bit: don't handle non-standard page sizes Scott Wood
2011-05-18 21:36   ` Benjamin Herrenschmidt [this message]
2011-05-18 21:50     ` Scott Wood
2011-05-18 21:54       ` Benjamin Herrenschmidt
2011-05-18 21:05 ` [PATCH 6/7] powerpc/mm: 64-bit: tlb handler micro-optimization Scott Wood
2011-05-18 21:37   ` Benjamin Herrenschmidt
2011-05-18 21:51     ` Scott Wood
2011-05-18 21:54       ` Benjamin Herrenschmidt
2011-05-18 22:27         ` Scott Wood
2011-05-18 21:05 ` [PATCH 7/7] powerpc/e5500: set MMU_FTR_USE_PAIRED_MAS Scott Wood
2011-05-18 21:38   ` Benjamin Herrenschmidt
2011-05-18 21:52     ` Scott Wood
2011-05-18 21:58       ` Benjamin Herrenschmidt
2011-05-18 21:32 ` [PATCH 1/7] powerpc/mm: 64-bit 4k: use page-sized PMDs Benjamin Herrenschmidt
2011-05-18 21:46   ` Scott Wood
2011-05-18 21:52     ` Benjamin Herrenschmidt

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