commit:     eee74b9fca1b5237299ee08fd041997e7271304a
Author:     Mike Pagano <mpagano <AT> gentoo <DOT> org>
AuthorDate: Sat Jun 11 18:59:34 2022 +0000
Commit:     Mike Pagano <mpagano <AT> gentoo <DOT> org>
CommitDate: Sat Jun 11 18:59:34 2022 +0000
URL:        https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=eee74b9f

linux-mod.eclass: Support module compression

The Linux kernel supports the compression of modules utilizing GZIP, XZ
and ZSTD.  Add support 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.

Closes: https://bugs.gentoo.org/850130

Signed-off-by: Mike Pagano <mpagano <AT> 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 6a820371b767..b7c13cbf7e76 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}"
 
                generate_modulesd "${objdir}/${modulename}"

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