linux-kernel - Re: [PATCH 0/5] firmware: Add support for loading compressed files

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Date:   Mon, 20 May 2019 11:56:07 +0200
From:   Takashi Iwai <tiwai@...e.de>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Luis Chamberlain <mcgrof@...nel.org>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/5] firmware: Add support for loading compressed files

On Mon, 20 May 2019 11:39:29 +0200,
Greg Kroah-Hartman wrote:
> 
> On Mon, May 20, 2019 at 11:26:42AM +0200, Takashi Iwai wrote:
> > Hi,
> > 
> > this is a patch set to add the support for loading compressed firmware
> > files.
> > 
> > The primary motivation is to reduce the storage size; e.g. currently
> > the amount of /lib/firmware on my machine counts up to 419MB, and this
> > can be reduced to 130MB file compression.  No bad deal.
> > 
> > The feature adds only fallback to the compressed file, so it should
> > work as it was as long as the normal firmware file is present.  The
> > f/w loader decompresses the content, so that there is no change needed
> > in the caller side.
> > 
> > Currently only XZ format is supported.  A caveat is that the kernel XZ
> > helper code supports only CRC32 (or none) integrity check type, so
> > you'll have to compress the files via xz -C crc32 option.
> > 
> > The patch set begins with a few other improvements and refactoring,
> > followed by the compression support.
> > 
> > In addition to this, dracut needs a small fix to deal with the *.xz
> > files.
> > 
> > Also, the latest patchset is found in topic/fw-decompress branch of my
> > sound.git tree:
> >   git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound.git
> 
> After a quick review, these all look good to me, nice job.
> 
> One recommendation, can we add support for testing this to the
> tools/testing/selftests/firmware/ tests?  And you did run those
> regression tests to verify that you didn't get any of the config options
> messed up, right? :)

Oh, do you believe I'm a so modern person who lets computer working on
everything? ;)  I only tested manually, so far, this will be my
homework today.

Thanks for pointing to it!


Takashi