[OS-BUILD PATCHv7] redhat/kernel.spec.template: Parallelize compression

[Prarit Bhargava (via Email Bridge)]

From: Prarit Bhargava

redhat/kernel.spec.template: Parallelize compression

This line in the kernel.spec file:

find $RPM_BUILD_ROOT/lib/modules/ -type f -name '*.ko' | xargs -P${RPM_BUILD_NCPUS} -r xz;

implies that ${RPM_BUILD_NCPUS} xz instances are run.  This is not true,
and this line actually applies ${RPM_BUILD_NCPUS} to a single instance of
xz.  This means that the compression has been done one module at a time
(ie, in serial) rather than in parallel as is implied by the code.

Use xarg's -n option to assign 16 cpus per process and parallelize the
compression.

Suggested-by: "Herton R. Krzesinski" 
Signed-off-by: Prarit Bhargava

diff --git a/redhat/kernel.spec.template b/redhat/kernel.spec.template
index blahblah..blahblah 100755
--- a/redhat/kernel.spec.template
+++ b/redhat/kernel.spec.template
@@ -2472,7 +2472,8 @@ find Documentation -type d | xargs chmod u+w
     fi \
   fi \
   if [ "%{zipmodules}" -eq "1" ]; then \
-    find $RPM_BUILD_ROOT/lib/modules/ -type f -name '*.ko' | xargs -P${RPM_BUILD_NCPUS} -r xz; \
+    echo "Compressing kernel modules ..." \
+    find $RPM_BUILD_ROOT/lib/modules/ -type f -name '*.ko' | xargs -n 16 -P${RPM_BUILD_NCPUS} -r xz; \
   fi \
 %{nil}

--
https://gitlab.com/cki-project/kernel-ark/-/merge_requests/2254