[PATCH] x86,build: Fix make -jN modules_install install

[Andy Lutomirski <luto@amacapital.net>]

Every few months, I forget why I type:

$ sudo make -j12 modules_install && sudo make -j12 install

instead of just:

$ sudo make -j12 modules_install install

I try the latter, it appears to work, and then my machine won't boot
because dracut got confused.  This fixes it once and for all: if you
ask make to install modules and a kernel, you almost certainly want
the modules installed *first* so that your initramfs scripts can
find the modules.

Signed-off-by: Andy Lutomirski <luto@amacapital.net>
---
 arch/x86/Makefile | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/x86/Makefile b/arch/x86/Makefile
index 33f71b0..7280d28 100644
--- a/arch/x86/Makefile
+++ b/arch/x86/Makefile
@@ -240,6 +240,15 @@ PHONY += install
 install:
 	$(Q)$(MAKE) $(build)=$(boot) $@
 
+# If installing modules and a kernel, it's very likely that some initramfs
+# script associated with installing the kernel will reference the modules,
+# so make sure that modules are installed first.
+ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
+  ifneq ($(filter modules_install,$(MAKECMDGOALS)),)
+    install: modules_install
+  endif
+endif
+
 PHONY += vdso_install
 vdso_install:
 	$(Q)$(MAKE) $(build)=arch/x86/vdso $@
-- 
1.9.3