linux-kernel - [BUG] lib: zram lz4 compression/decompression still broken on big endian

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Message-ID: <CALjTZvavWqtLoGQiWb+HxHP4rwRwaZiP0QrPRb+9kYGdicXohg@mail.gmail.com>
Date:	Tue, 5 Apr 2016 15:07:48 +0100
From:	Rui Salvaterra <rsalvaterra@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	eunb.song@...sung.com, gregkh@...uxfoundation.org,
	minchan@...nel.org, linux-mm@...ck.org
Subject: [BUG] lib: zram lz4 compression/decompression still broken on big endian

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