[gentoo-dev] [PATCH] linux-mod.eclass: Support module compression

[Mike Pagano]

The Linux kernel supports the compression of modules utilizing GZIP, XZ
and ZSTD.  Add code into linux-mod.eclass to support this for out of
tree modules utilizing the compression binary specified in the kernel
config.

Note that if the binary which provides the compression is not present on
the system the kernel would have failed to build with an error
indicating the missing binaries name.

Signed-off-by: Mike Pagano <mpag...@gentoo.org>
---
 eclass/linux-mod.eclass | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/eclass/linux-mod.eclass b/eclass/linux-mod.eclass
index 6a820371b..b7c13cbf7 100644
--- a/eclass/linux-mod.eclass
+++ b/eclass/linux-mod.eclass
@@ -711,7 +711,22 @@ linux-mod_src_install() {
                einfo "Installing ${modulename} module"
                cd "${objdir}" || die "${objdir} does not exist"
                insinto "${INSTALL_MOD_PATH}"/lib/modules/${KV_FULL}/${libdir}
-               doins ${modulename}.${KV_OBJ} || die "doins ${modulename}.${KV_OBJ} 
failed"
+
+               # check here for CONFIG_MODULE_COMPRESS_<compression option> 
(NONE, GZIP, XZ, ZSTD)
+               # and similarily compress the module being built if != NONE.
+
+               if linux_chkconfig_present MODULE_COMPRESS_XZ; then
+                       xz ${modulename}.${KV_OBJ}
+                       doins ${modulename}.${KV_OBJ}.xz || die "doins 
${modulename}.${KV_OBJ}.xz failed"
+               elif linux_chkconfig_present MODULE_COMPRESS_GZIP; then
+                       gzip ${modulename}.${KV_OBJ}
+                       doins ${modulename}.${KV_OBJ}.gz || die "doins 
${modulename}.${KV_OBJ}.gz failed"
+               elif linux_chkconfig_present MODULE_COMPRESS_ZSTD; then
+                       zstd ${modulename}.${KV_OBJ}
+                       doins ${modulename}.${KV_OBJ}.zst || die "doins 
${modulename}.${KV_OBJ}.zst failed"
+               else
+                       doins ${modulename}.${KV_OBJ} || die "doins 
${modulename}.${KV_OBJ} failed"
+               fi
                cd "${OLDPWD}"

--
2.35.1

generate_modulesd "${objdir}/${modulename}"

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