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    SubjectRe: [PATCH RFC 1/4] firmware: Add the support for ZSTD-compressed firmware files
    On Wed, Feb 17, 2021 at 02:34:34PM +0100, Takashi Iwai wrote:
    > On Wed, 17 Feb 2021 14:24:19 +0100,
    > Luis Chamberlain wrote:
    > >
    > > On Wed, Jan 27, 2021 at 04:49:36PM +0100, Takashi Iwai wrote:
    > > > Due to the popular demands on ZSTD, here is a patch to add a support
    > > > of ZSTD-compressed firmware files via the direct firmware loader.
    > > > It's just like XZ-compressed file support, providing a decompressor
    > > > with ZSTD. Since ZSTD API can give the decompression size beforehand,
    > > > the code is even simpler than XZ.
    > > >
    > > > Signed-off-by: Takashi Iwai <tiwai@suse.de>
    > >
    > > It also occurs to me that having a simple like #define HAVE_FIRMWARE_COMPRESS_ZSTD
    > > on include/linux/firmware.h would enable userspace to be aware (if they
    > > have kernel sources) to determine if the kernels supports this format.
    >
    > Extending that idea, we might want to have a sysfs entry showing the
    > supported formats instead? This will allow to judge dynamically.

    What could userspace do with that information?

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