linux-kernel - Re: [PATCH 7/7] lib/lzo: separate lzo-rle from lzo

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Date:   Thu, 29 Nov 2018 13:43:33 +0900
From:   Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:     Dave Rodgman <dave.rodgman@....com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        nd <nd@....com>,
        "herbert@...dor.apana.org.au" <herbert@...dor.apana.org.au>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Matt Sealey <Matt.Sealey@....com>,
        "nitingupta910@...il.com" <nitingupta910@...il.com>,
        "rpurdie@...nedhand.com" <rpurdie@...nedhand.com>,
        "markus@...rhumer.com" <markus@...rhumer.com>,
        "minchan@...nel.org" <minchan@...nel.org>,
        "sergey.senozhatsky.work@...il.com" 
        <sergey.senozhatsky.work@...il.com>,
        "sonnyrao@...gle.com" <sonnyrao@...gle.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: Re: [PATCH 7/7] lib/lzo: separate lzo-rle from lzo

On (11/27/18 16:19), Dave Rodgman wrote:
>  Documentation/lzo.txt         |  12 ++-
>  crypto/Makefile               |   2 +-
>  crypto/lzo-rle.c              | 175 ++++++++++++++++++++++++++++++++++++++++++
>  crypto/tcrypt.c               |   4 +-
>  drivers/block/zram/zcomp.c    |   1 +
>  drivers/block/zram/zram_drv.c |   2 +-
>  include/linux/lzo.h           |   4 +
>  lib/lzo/lzo1x_compress.c      |  42 +++++++---
>  lib/lzo/lzodefs.h             |   3 +-
>  9 files changed, 227 insertions(+), 18 deletions(-)
>  create mode 100644 crypto/lzo-rle.c

[..]

> +static struct crypto_alg alg = {
> +	.cra_name		= "lzo-rle",
> +	.cra_flags		= CRYPTO_ALG_TYPE_COMPRESS,
> +	.cra_ctxsize		= sizeof(struct lzorle_ctx),
> +	.cra_module		= THIS_MODULE,
> +	.cra_init		= lzorle_init,
> +	.cra_exit		= lzorle_exit,
> +	.cra_u			= { .compress = {
> +	.coa_compress		= lzorle_compress,
> +	.coa_decompress		= lzorle_decompress } }
> +};

A nitpick:
  indentation for .compress assignment is a bit confusing, maybe.


[..]
> +++ b/drivers/block/zram/zcomp.c
> @@ -20,6 +20,7 @@
>  
>  static const char * const backends[] = {
>  	"lzo",
> +	"lzo-rle",
>  #if IS_ENABLED(CONFIG_CRYPTO_LZ4)
>  	"lz4",
>  #endif

[..]

> +++ b/drivers/block/zram/zram_drv.c
> @@ -41,7 +41,7 @@ static DEFINE_IDR(zram_index_idr);
>  static DEFINE_MUTEX(zram_index_mutex);
>  
>  static int zram_major;
> -static const char *default_compressor = "lzo";
> +static const char *default_compressor = "lzo-rle";

OK, so it's not just "separate lzo-rle", it's also "switch zram to
a new compression algorithm by default". I'd say that usually I'd
expect this to be separate patches.

	-ss