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Date: Tue, 5 Apr 2016 11:34:39 -0400
From: Greg KH <gregkh@linuxfoundation.org>
To: Rui Salvaterra <rsalvaterra@gmail.com>
Cc: linux-kernel@vger.kernel.org, eunb.song@samsung.com, minchan@kernel.org,
        linux-mm@kvack.org
Subject: Re: [BUG] lib: zram lz4 compression/decompression still broken on
 big endian
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On Tue, Apr 05, 2016 at 03:07:48PM +0100, Rui Salvaterra wrote:
> Hi,
> 
> 
> I apologise in advance if I've cc'ed too many/the wrong people/lists.
> 
> Whenever I try to use zram with lz4, on my Power Mac G5 (tested with
> kernel 4.4.0-16-powerpc64-smp from Ubuntu 16.04 LTS), I get the
> following on my dmesg:
> 
> [13150.675820] zram: Added device: zram0
> [13150.704133] zram0: detected capacity change from 0 to 5131976704
> [13150.715960] zram: Decompression failed! err=-1, page=0
> [13150.716008] zram: Decompression failed! err=-1, page=0
> [13150.716027] zram: Decompression failed! err=-1, page=0
> [13150.716032] Buffer I/O error on dev zram0, logical block 0, async page read
> 
> I believe Eunbong Song wrote a patch [1] to fix this (or a very
> identical) bug on MIPS, but it never got merged (maybe
> incorrect/incomplete?). Is there any hope of seeing this bug fixed?
> 
> 
> Thanks,
> 
> Rui Salvaterra
> 
> 
> [1] http://comments.gmane.org/gmane.linux.kernel/1752745

For some reason it never got merged, sorry, I don't remember why.

Have you tested this patch?  If so, can you resend it with your
tested-by: line added to it?

thanks,

greg k-h