[U-Boot] [PATCH V2] fs/fat: align disk buffers on cache line to enable DMA and cache

[Dirk Behme <dirk.behme@de.bosch.com>]

On 27.03.2012 18:28, Dirk Behme wrote:
> On 27.03.2012 16:20, Anatolij Gustschin wrote:
>> Hello Dirk,
>>
>> On Sat, 24 Mar 2012 08:18:38 +0100
>> Dirk Behme<dirk.behme@googlemail.com>  wrote:
>>
>>> On 13.03.2012 02:24, Eric Nelson wrote:
>>>> On 03/04/2012 02:46 PM, Eric Nelson wrote:
>>>>> Signed-off-by: Eric Nelson<eric.nelson@boundarydevices.com>
>>>>> Acked-by: Mike Frysinger<vapier@gentoo.org>
>>>>> ---
>>>>> fs/fat/fat.c | 14 ++++++++------
>>>>> 1 files changed, 8 insertions(+), 6 deletions(-)
>>>>>
>>>>> diff --git a/fs/fat/fat.c b/fs/fat/fat.c
>>>>> index 1f95eb4..f3c48bb 100644
>>>>> --- a/fs/fat/fat.c
>>>>> +++ b/fs/fat/fat.c
>>>>> @@ -31,6 +31,8 @@
>>>>> #include<fat.h>
>>>>> #include<asm/byteorder.h>
>>>>> #include<part.h>
>>>>> +#include<malloc.h>
>>>>> +#include<linux/compiler.h>
>>>>>
>>>>> /*
>>>>> * Convert a string to lowercase.
>>>>> @@ -62,7 +64,7 @@ static int disk_read(__u32 block, __u32 nr_blocks,
>>>>> void *buf)
>>>>>
>>>>> int fat_register_device (block_dev_desc_t * dev_desc, int part_no)
>>>>> {
>>>>> - unsigned char buffer[dev_desc->blksz];
>>>>> + ALLOC_CACHE_ALIGN_BUFFER(unsigned char, buffer, dev_desc->blksz);
>>>>   >  <snip>
>>>>
>>>> Hi Wolfgang,
>>>>
>>>> Have you had a chance to review this patch? Is there another
>>>> maintainer for fs/fat?
>>>>
>>>> Please let me know if you need this updated.
>>>>
>>>> There's another patch that was acked by Mike but is otherwise
>>>> lingering here:
>>>>
>>>> http://lists.denx.de/pipermail/u-boot/2012-March/119309.html
>>>>
>>>> Both of these are needed before enabling the data cache on i.MX6 when
>>>> using
>>>> the FAT filesystem.
>>> Anybody likes to comment/apply this patch?
>> Both, this patch and the patch referenced by the above link were
>> submitted when the merge window was closed. So, the patches will
>> probably be applied to next when rc1 is out, unless Wolfgang
>> decides to accept them for coming release.
> 
> Ok, thanks!
> 
> Do we have a -next branch for stuff like this, then?

There should be a -next from Wolfgang for

http://patchwork.ozlabs.org/patch/144462/

http://patchwork.ozlabs.org/patch/151799/

now :)

Best regards

Dirk