linux-kernel - [PATCH 3/3] x86/boot: Add option to add modules.img to {fd,hd,iso}image

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Date:   Mon, 19 Apr 2021 13:54:38 -0700
From:   "H. Peter Anvin" <hpa@...or.com>
To:     Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
        Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Michal Marek <michal.lkml@...kovi.net>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Kbuild Mailing List <linux-kbuild@...r.kernel.org>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH 3/3] x86/boot: Add option to add modules.img to {fd,hd,iso}image

From: "H. Peter Anvin" (Intel) <hpa@...or.com>

Make it easy to generate a disk image which includes the all-modules
initramfs image.

Signed-off-by: H. Peter Anvin (Intel) <hpa@...or.com>
---
 arch/x86/Makefile      |  3 ++-
 arch/x86/boot/Makefile | 11 +++++++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 943f26a32834..74f4e66568d7 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -309,7 +309,8 @@ define archhelp
   echo  '  isoimage		- Create a boot CD-ROM image (arch/x86/boot/image.iso)'
   echo  '			  bzdisk/fdimage*/hdimage/isoimage also accept:'
   echo  '			  FDARGS="..."  arguments for the booted kernel'
-  echo  '                  	  FDINITRD=file initrd for the booted kernel'
+  echo  '			  FDINITRD=file initrd for the booted kernel'
+  echo  '			  FDMODS=1 to include all modules as an initrd'
   echo  ''
   echo  '  kvm_guest.config	- Enable Kconfig items for running this kernel as a KVM guest'
   echo  '  xen.config		- Enable Kconfig items for running this kernel as a Xen guest'
diff --git a/arch/x86/boot/Makefile b/arch/x86/boot/Makefile
index dfbc26a8e924..601ade7adc70 100644
--- a/arch/x86/boot/Makefile
+++ b/arch/x86/boot/Makefile
@@ -119,9 +119,20 @@ $(obj)/compressed/vmlinux: FORCE
 FDARGS =
 # Set this if you want one or more initrds included in the image
 FDINITRD =
+# Set this to 1 if you want usr/modules.img included in the image
+FDMODS =
 
 imgdeps = $(obj)/bzImage $(obj)/mtools.conf $(src)/genimage.sh
 
+ifneq ($(FDMODS),)
+imgdeps  += $(objtree)/usr/modules.img
+FDINITRD += $(objtree)/usr/modules.img
+
+$(objtree)/usr/modules.img:
+	$(Q)$(MAKE) -f $(srctree)/Makefile usr/modules.img
+KBUILD_MODULES := 1
+endif
+
 $(obj)/mtools.conf: $(src)/mtools.conf.in
 	sed -e 's|@OBJ@|$(obj)|g' < $< > $@
 
-- 
2.30.2