linux-kernel - Re: [PATCH 1/4] lib: Update LZ4 compressor module

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Date:   Sun, 22 Jan 2017 12:05:29 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Sven Schmidt <4sschmid@...ormatik.uni-hamburg.de>
Cc:     akpm@...ux-foundation.org, bongkyu.kim@....com,
        rsalvaterra@...il.com, sergey.senozhatsky@...il.com,
        linux-kernel@...r.kernel.org, herbert@...dor.apana.org.au,
        davem@...emloft.net, linux-crypto@...r.kernel.org,
        anton@...msg.org, ccross@...roid.com, keescook@...omium.org,
        tony.luck@...el.com, phillip@...ashfs.org.uk
Subject: Re: [PATCH 1/4] lib: Update LZ4 compressor module

On Sat, Jan 21, 2017 at 04:09:08PM +0100, Sven Schmidt wrote:
> This patch updates LZ4 kernel module to LZ4 v1.7.3 by Yann Collet.
> The kernel module is inspired by the previous work by Chanho Min.
> The updated LZ4 module will not break existing code since there were alias
> methods added to ensure backwards compatibility.
> 
> API changes:
> 
> New method LZ4_compress_fast which differs from the variant available
> in kernel by the new acceleration parameter,
> allowing to trade compression ratio for more compression speed
> and vice versa.
> 
> LZ4_decompress_fast is the respective decompression method, featuring a very
> fast decoder (multiple GB/s per core), able to reach RAM speed in multi-core
> systems. The decompressor allows to decompress data compressed with
> LZ4 fast as well as the LZ4 HC (high compression) algorithm.
> 
> Also the useful functions LZ4_decompress_safe_partial
> LZ4_compress_destsize were added. The latter reverses the logic by trying to
> compress as much data as possible from source to dest while the former aims
> to decompress partial blocks of data.
> 
> A bunch of streaming functions were also added
> which allow compressig/decompressing data in multiple steps
> (so called "streaming mode").
> 
> The methods lz4_compress and lz4_decompress_unknownoutputsize
> are now known as LZ4_compress_default respectivley LZ4_decompress_safe.
> The old methods are still available for providing backwards compatibility.
> 
> Signed-off-by: Sven Schmidt <4sschmid@...ormatik.uni-hamburg.de>

Please fix up so that it doesn't break the build as reported by the
kbuild tool...

thanks,

greg k-h