Re: Direct I/O bug in kernel

[Victor Meyerson]

----- Original Message -----

> From: Hillf Danton <dhillf@xxxxxxxxx>
> To: Victor Meyerson <calculuspenguin@xxxxxxxxx>
> Cc: "linux-mips@xxxxxxxxxxxxxx" <linux-mips@xxxxxxxxxxxxxx>; Ralf Baechle <ralf@xxxxxxxxxxxxxx>; LKML <linux-kernel@xxxxxxxxxxxxxxx>
> Sent: Friday, July 27, 2012 7:47 AM
> Subject: Re: Direct I/O bug in kernel
> 
> On Wed, Jul 25, 2012 at 1:28 AM, Victor Meyerson
> <calculuspenguin@xxxxxxxxx> wrote:
>> 
>>  Still different checksums and I used the same random-file from my first 
> test.
>> 
> Then try the fix at
>             https://lkml.org/lkml/2012/7/27/54
> 

I tried that patch, although I had to edit a slightly different line as dio_bio_alloc was near line 392 instead of 349 in the version of fs/direct-io.c in my tree.  I still got different checksums between the two files and even different checksums from my earlier attempts.

I am not sure if this helps, but Ralf asked if I can try a different page size to see if this problem occurs.  I originally had CONFIG_PAGE_SIZE_4KB=y and changed it to CONFIG_PAGE_SIZE_16KB=y (via menuconfig).  Having a page size of 16KB (and the above patch not applied) made the checksum on the files match each other and match the file made from the working kernel.

Victor

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/