linux-kernel - Re: [patch] agp: don't lock pages

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Date:	Wed, 25 Jul 2007 11:44:18 -0700
From:	"Bret Towe" <magnade@...il.com>
To:	"Nick Piggin" <npiggin@...e.de>
Cc:	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Benjamin Herrenschmidt" <benh@...nel.crashing.org>,
	airlied@...il.com
Subject: Re: [patch] agp: don't lock pages

On 7/25/07, Nick Piggin <npiggin@...e.de> wrote:
> Hi,
>
> Does this patch solve the X problem? Does anyone see anything wrong
> with it or know why agp was locking the pages?

Yeap the mac mini is happy again
Thanks

> --
> AGP should not need to lock pages. They are not protecting any race
> because there is no lock_page calls, only SetPageLocked.
>
> This is causing hangs with d00806b183152af6d24f46f0c33f14162ca1262a.
>
> Signed-off-by: Nick Piggin <npiggin@...e.de>
>
> diff --git a/drivers/char/agp/generic.c b/drivers/char/agp/generic.c
> index d535c40..3db4f40 100644
> --- a/drivers/char/agp/generic.c
> +++ b/drivers/char/agp/generic.c
> @@ -1170,7 +1170,6 @@ void *agp_generic_alloc_page(struct agp_
>         map_page_into_agp(page);
>
>         get_page(page);
> -       SetPageLocked(page);
>         atomic_inc(&agp_bridge->current_memory_agp);
>         return page_address(page);
>  }
> @@ -1187,7 +1186,6 @@ void agp_generic_destroy_page(void *addr
>         page = virt_to_page(addr);
>         unmap_page_from_agp(page);
>         put_page(page);
> -       unlock_page(page);
>         free_page((unsigned long)addr);
>         atomic_dec(&agp_bridge->current_memory_agp);
>  }
> diff --git a/drivers/char/agp/intel-agp.c b/drivers/char/agp/intel-agp.c
> index a124060..2f319f4 100644
> --- a/drivers/char/agp/intel-agp.c
> +++ b/drivers/char/agp/intel-agp.c
> @@ -213,7 +213,6 @@ static void *i8xx_alloc_pages(void)
>         }
>         global_flush_tlb();
>         get_page(page);
> -       SetPageLocked(page);
>         atomic_inc(&agp_bridge->current_memory_agp);
>         return page_address(page);
>  }
> @@ -229,7 +228,6 @@ static void i8xx_destroy_pages(void *add
>         change_page_attr(page, 4, PAGE_KERNEL);
>         global_flush_tlb();
>         put_page(page);
> -       unlock_page(page);
>         __free_pages(page, 2);
>         atomic_dec(&agp_bridge->current_memory_agp);
>  }
> diff --git a/drivers/char/agp/sgi-agp.c b/drivers/char/agp/sgi-agp.c
> index cda608c..98cf8ab 100644
> --- a/drivers/char/agp/sgi-agp.c
> +++ b/drivers/char/agp/sgi-agp.c
> @@ -51,7 +51,6 @@ static void *sgi_tioca_alloc_page(struct
>                 return NULL;
>
>         get_page(page);
> -       SetPageLocked(page);
>         atomic_inc(&agp_bridge->current_memory_agp);
>         return page_address(page);
>  }
> -
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