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

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Message-ID: <20160406053325.GA415@swordfish>
Date:	Wed, 6 Apr 2016 14:33:26 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:	Rui Salvaterra <rsalvaterra@...il.com>
Cc:	Greg KH <gregkh@...uxfoundation.org>, linux-kernel@...r.kernel.org,
	eunb.song@...sung.com, minchan@...nel.org, linux-mm@...ck.org,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: Re: [BUG] lib: zram lz4 compression/decompression still broken on
 big endian

On (04/05/16 17:02), Rui Salvaterra wrote:
[..]
> > 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
> 
> Hi, Greg
> 
> 
> No, I haven't tested the patch at all. I want to do so, and fix if if
> necessary, but I still need to learn how to (meaning, I need to watch
> your "first kernel patch" presentation again). I'd love to get
> involved in kernel development, and this seems to be a good
> opportunity, if none of the kernel gods beat me to it (I may need a
> month, but then again nobody complained about this bug in almost two
> years).

Hello Rui,

may we please ask you to test the patch first? quite possible there
is nothing to fix there; I've no access to mips h/w but the patch
seems correct to me.

LZ4_READ_LITTLEENDIAN_16 does get_unaligned_le16(), so
LZ4_WRITE_LITTLEENDIAN_16 must do put_unaligned_le16() /* not put_unaligned() */

	-ss