linux-kernel - Re: [PATCH] ramzswap: remove ARM specific d-cache hack

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Date:	Sun, 13 Dec 2009 06:51:42 +0530
From:	Nitin Gupta <ngupta@...are.org>
To:	Pekka Enberg <penberg@...helsinki.fi>
CC:	Greg KH <greg@...ah.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ramzswap: remove ARM specific d-cache hack

On 12/12/2009 01:11 PM, Pekka Enberg wrote:
> On Sat, Dec 12, 2009 at 8:14 AM, Nitin Gupta <ngupta@...are.org> wrote:
>> Remove d-cache hack in ramzswap driver that was needed
>> to workaround a bug in ARM version of update_mmu_cache()
>> which caused stale data in d-cache to be transferred to
>> userspace. This bug was fixed by git commit:
>>        787b2faadc4356b6c2c71feb42fb944fece9a12f
>> This also brings down one entry in TODO file.
>>
>> Signed-off-by: Nitin Gupta <ngupta@...are.org>
> 
> Acked-by: Pekka Enberg <penberg@...helsinki.fi>

Thanks for review Pekka.
Now wondering when this patch will be committed to mainline.

Nitin

> 
>> ---
>>  drivers/staging/ramzswap/TODO           |    1 -
>>  drivers/staging/ramzswap/ramzswap_drv.c |   28 +++-------------------------
>>  2 files changed, 3 insertions(+), 26 deletions(-)
>>
>> diff --git a/drivers/staging/ramzswap/TODO b/drivers/staging/ramzswap/TODO
>> index bac40d6..8d64e28 100644
>> --- a/drivers/staging/ramzswap/TODO
>> +++ b/drivers/staging/ramzswap/TODO
>> @@ -1,6 +1,5 @@
>>  TODO:
>>        - Add support for swap notifiers
>> -       - Remove CONFIG_ARM hack
>>
>>  Please send patches to Greg Kroah-Hartman <greg@...ah.com> and
>>  Nitin Gupta <ngupta@...are.org>
>> diff --git a/drivers/staging/ramzswap/ramzswap_drv.c b/drivers/staging/ramzswap/ramzswap_drv.c
>> index b839f05..989fac5 100644
>> --- a/drivers/staging/ramzswap/ramzswap_drv.c
>> +++ b/drivers/staging/ramzswap/ramzswap_drv.c
>> @@ -222,28 +222,6 @@ out:
>>        return ret;
>>  }
>>
>> -static void ramzswap_flush_dcache_page(struct page *page)
>> -{
>> -#ifdef CONFIG_ARM
>> -       int flag = 0;
>> -       /*
>> -        * Ugly hack to get flush_dcache_page() work on ARM.
>> -        * page_mapping(page) == NULL after clearing this swap cache flag.
>> -        * Without clearing this flag, flush_dcache_page() will simply set
>> -        * "PG_dcache_dirty" bit and return.
>> -        */
>> -       if (PageSwapCache(page)) {
>> -               flag = 1;
>> -               ClearPageSwapCache(page);
>> -       }
>> -#endif
>> -       flush_dcache_page(page);
>> -#ifdef CONFIG_ARM
>> -       if (flag)
>> -               SetPageSwapCache(page);
>> -#endif
>> -}
>> -
>>  void ramzswap_ioctl_get_stats(struct ramzswap *rzs,
>>                        struct ramzswap_ioctl_stats *s)
>>  {
>> @@ -655,7 +633,7 @@ static int handle_zero_page(struct bio *bio)
>>        memset(user_mem, 0, PAGE_SIZE);
>>        kunmap_atomic(user_mem, KM_USER0);
>>
>> -       ramzswap_flush_dcache_page(page);
>> +       flush_dcache_page(page);
>>
>>        set_bit(BIO_UPTODATE, &bio->bi_flags);
>>        bio_endio(bio, 0);
>> @@ -679,7 +657,7 @@ static int handle_uncompressed_page(struct ramzswap *rzs, struct bio *bio)
>>        kunmap_atomic(user_mem, KM_USER0);
>>        kunmap_atomic(cmem, KM_USER1);
>>
>> -       ramzswap_flush_dcache_page(page);
>> +       flush_dcache_page(page);
>>
>>        set_bit(BIO_UPTODATE, &bio->bi_flags);
>>        bio_endio(bio, 0);
>> @@ -779,7 +757,7 @@ static int ramzswap_read(struct ramzswap *rzs, struct bio *bio)
>>                goto out;
>>        }
>>
>> -       ramzswap_flush_dcache_page(page);
>> +       flush_dcache_page(page);
>>
>>        set_bit(BIO_UPTODATE, &bio->bi_flags);
>>        bio_endio(bio, 0);
>> --
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> 

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