redhat/configs: enable in kernel compression/decompression of compressed modules

JIRA: https://issues.redhat.com/browse/RHEL-79278
Upstream Status: git@gitlab.com:cki-project/kernel-ark.git
Conflicts: CONFIG_MODULE_COMPRESS file is in rhel directory on
           c10s/rhel10, move it to redhat/configs/common/generic

commit 4e86f3d57a23ad39306a4a75a71fa0bbf25be76c
Author: Herton R. Krzesinski <herton@redhat.com>
Date:   Mon Feb 17 16:51:56 2025 -0300

    redhat/configs: enable in kernel compression/decompression of compressed modules

    Our packaging for some time has shipped modules compressed with xz.
    These are decompressed by modprobe/kmod on userspace, then provided to the
    kernel.

    However, the kernel for some time now supports in-kernel decompression since
    the change b1ae6dc ("module: add in-kernel support for decompressing").
    Doing in kernel decompression is better as pointed out by Andrew Zaborowski in
    RHEL-79278: it allows kmod to use the finit_module() syscall, which allows the
    kernel to better detect concurrent loading of modules preventing spikes in usage
    of memory/vmalloc memory. The prevention of memory spikes/usage in concurrent
    module loading was handled by Linus in commit 9b9879f ("modules: catch
    concurrent module loads, treat them as idempotent"). But we are not able to take
    advantage of this fix if we don't have in kernel decompression of modules enabled,
    since kmod will not use finit_module() as the module is compressed and it
    fallbacks to init_module().

    Thus, make sure we enable in-kernel decompression of modules, which requires to
    enable MODULE_COMPRESS: the key here is to keep MODULE_COMPRESS_ALL disabled,
    which allows us to keep our current build infra-structure/spec file untouched,
    since we build and compress the modules by ourselves and in the proper order
    required due module signing. At the same time, it should allow external modules
    to continue to be built without interference of enabling compress/decompress.

Signed-off-by: Herton R. Krzesinski <herton@redhat.com>

Author: Herton R. Krzesinski

redhat/configs/common/generic/CONFIG_MODULE_COMPRESS

@@ -0,0 +1 @@
+CONFIG_MODULE_COMPRESS=y

redhat/configs/common/generic/CONFIG_MODULE_COMPRESS_ALL

@@ -0,0 +1 @@
+# CONFIG_MODULE_COMPRESS_ALL is not set

redhat/configs/common/generic/CONFIG_MODULE_COMPRESS_NONE

@@ -1 +1 @@
-# CONFIG_MODULE_COMPRESS_XZ is not set
+CONFIG_MODULE_COMPRESS_XZ=y

redhat/configs/common/generic/CONFIG_MODULE_COMPRESS_XZ

@@ -0,0 +1 @@
+CONFIG_MODULE_DECOMPRESS=y