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From:   Dave Rodgman <dave.rodgman@arm.com>
To:     Anatoly Pugachev <matorola@gmail.com>,
        Sparc kernel list <sparclinux@vger.kernel.org>
CC:     Linux Kernel list <linux-kernel@vger.kernel.org>
Subject: Re: [sparc64] Kernel unaligned access at TPC lzo1x_1_do_compress
Thread-Topic: [sparc64] Kernel unaligned access at TPC lzo1x_1_do_compress
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Thanks Anatoly, I'll take a look at this. Could you please let me know the =
exact hardware you're running on?

thanks

Dave

________________________________________
From: linux-kernel-owner@vger.kernel.org <linux-kernel-owner@vger.kernel.or=
g> on behalf of Anatoly Pugachev <matorola@gmail.com>
Sent: 08 September 2019 11:58:08
To: Sparc kernel list
Cc: Linux Kernel list
Subject: [sparc64] Kernel unaligned access at TPC lzo1x_1_do_compress

Hello!

trying to use zram block device, shows the following:

# zramctl -f -s 16g
# cat /sys/block/zram0/comp_algorithm
lzo [lzo-rle] lz4 lz4hc 842 zstd
# zramctl
NAME       ALGORITHM DISKSIZE  DATA COMPR TOTAL STREAMS MOUNTPOINT
/dev/zram0 lzo-rle        16G 10.4M    4K  112K      32

# mkfs.xfs /dev/zram0
...

[   71.095998] zram: Added device: zram0
[   71.765591] zram0: detected capacity change from 0 to 17179869184
[   80.058772] Kernel unaligned access at TPC[8f2534]
lzo1x_1_do_compress+0x1b4/0x820
[   80.073832] Kernel unaligned access at TPC[8f2534]
lzo1x_1_do_compress+0x1b4/0x820
[   80.073866] Kernel unaligned access at TPC[8f2534]
lzo1x_1_do_compress+0x1b4/0x820
[   80.074709] Kernel unaligned access at TPC[8f2534]
lzo1x_1_do_compress+0x1b4/0x820
[   80.074923] Kernel unaligned access at TPC[8f2534]
lzo1x_1_do_compress+0x1b4/0x820


all other tested compression algorithms (lzo, lz4, lz4hc, deflate,
842) work without producing kernel TPC.
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