On Mon, Jul 06, 2020 at 08:46:00PM -0700, Nick Terrell wrote: > From: Nick Terrell <terrelln@xxxxxx> > > * Adds the zstd cmd to scripts/Makefile.lib > * Adds the HAVE_KERNEL_ZSTD and KERNEL_ZSTD options > > Architecture specific support is still needed for decompression. > > diff --git a/scripts/Makefile.lib b/scripts/Makefile.lib > index 916b2f7f7098..d960f8815f87 100644 > --- a/scripts/Makefile.lib > +++ b/scripts/Makefile.lib > @@ -413,6 +413,21 @@ quiet_cmd_xzkern = XZKERN $@ > quiet_cmd_xzmisc = XZMISC $@ > cmd_xzmisc = cat $(real-prereqs) | $(XZ) --check=crc32 --lzma2=dict=1MiB > $@ > > +# ZSTD > +# --------------------------------------------------------------------------- > +# Appends the uncompressed size of the data using size_append. The .zst > +# format has the size information available at the beginning of the file too, > +# but it's in a more complex format and it's good to avoid changing the part > +# of the boot code that reads the uncompressed size. > +# Note that the bytes added by size_append will make the zstd tool think that > +# the file is corrupt. This is expected. > + > +quiet_cmd_zstd = ZSTD $@ > +cmd_zstd = (cat $(filter-out FORCE,$^) | \ ^^ should just be $(real-prereqs) > + zstd -19 && \ > + $(call size_append, $(filter-out FORCE,$^))) > $@ || \ ^^ size_append does not take arguments. It's used as just $(size_append) and will always output shell code to print the total size of $(real-prereqs) -- see other compressor command definitions. > + (rm -f $@ ; false) > + > # ASM offsets > # --------------------------------------------------------------------------- > > -- > 2.27.0 >
