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a797b423d2
Parsing uncompressed cpio archives in this shell script requires
running multiple processes for each archive member.
This was not too bad when there were usually only a few microcode
blobs in an uncompressed archive, but now that we put compressed
kernel modules in an uncompressed archive, it became very slow indeed.
Rewrite it in C so that it's acceptably fast.
This should have no functional changes, except that it adds support
for an initramfs with no compressed part.
Fixes: 81fd41f72dd8 ("Put compressed kernel modules and firmware in an uncompressed cpio")
Signed-off-by: Ben Hutchings <benh@debian.org>