[xen staging] xen: rework `checkpolicy` detection when using "randconfig"

[patchbot@xxxxxxx]

commit 0b000a2ce8131df442d6444d2d3e0a8c7f9a1cf5
Author:     Anthony PERARD <anthony.perard@xxxxxxxxxx>
AuthorDate: Wed Sep 29 11:58:15 2021 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Wed Sep 29 11:58:15 2021 +0200

    xen: rework `checkpolicy` detection when using "randconfig"
    
    This patch allows to easily add more override which depends on the
    environment.
    
    Also, move the check out of Config.mk and into xen/ build system.
    Nothing in tools/ is using that information as it's done by
    ./configure.
    
    We named the new file ".allconfig.tmp" as ".*.tmp" are already ignored
    via .gitignore.
    
    Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
    Reviewed-by: Luca Fancellu <luca.fancellu@xxxxxxx>
    Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 Config.mk    |  6 ------
 xen/Makefile | 20 +++++++++++++++++---
 2 files changed, 17 insertions(+), 9 deletions(-)

diff --git a/Config.mk b/Config.mk
index e7af4a402d..6587c7d626 100644
--- a/Config.mk
+++ b/Config.mk
@@ -137,12 +137,6 @@ export XEN_HAS_BUILD_ID=y
 build_id_linker := --build-id=sha1
 endif
 
-ifndef XEN_HAS_CHECKPOLICY
-    CHECKPOLICY ?= checkpolicy
-    XEN_HAS_CHECKPOLICY := $(shell $(CHECKPOLICY) -h 2>&1 | grep -q xen && 
echo y || echo n)
-    export XEN_HAS_CHECKPOLICY
-endif
-
 define buildmakevars2shellvars
     export PREFIX="$(prefix)";                                            \
     export XEN_SCRIPT_DIR="$(XEN_SCRIPT_DIR)";                            \
diff --git a/xen/Makefile b/xen/Makefile
index f47423dacd..7c2ffce0fc 100644
--- a/xen/Makefile
+++ b/xen/Makefile
@@ -17,6 +17,8 @@ export XEN_BUILD_HOST ?= $(shell hostname)
 PYTHON_INTERPRETER     := $(word 1,$(shell which python3 python python2 
2>/dev/null) python)
 export PYTHON          ?= $(PYTHON_INTERPRETER)
 
+export CHECKPOLICY     ?= checkpolicy
+
 export BASEDIR := $(CURDIR)
 export XEN_ROOT := $(BASEDIR)/..
 
@@ -178,6 +180,8 @@ CFLAGS += $(CLANG_FLAGS)
 export CLANG_FLAGS
 endif
 
+export XEN_HAS_CHECKPOLICY := $(call success,$(CHECKPOLICY) -h 2>&1 | grep -q 
xen)
+
 export root-make-done := y
 endif # root-make-done
 
@@ -189,14 +193,24 @@ ifeq ($(config-build),y)
 # *config targets only - make sure prerequisites are updated, and descend
 # in tools/kconfig to make the *config target
 
+# Create a file for KCONFIG_ALLCONFIG which depends on the environment.
+# This will be use by kconfig targets 
allyesconfig/allmodconfig/allnoconfig/randconfig
+filechk_kconfig_allconfig = \
+    $(if $(findstring n,$(XEN_HAS_CHECKPOLICY)), echo 
'CONFIG_XSM_FLASK_POLICY=n';) \
+    $(if $(KCONFIG_ALLCONFIG), cat $(KCONFIG_ALLCONFIG);) \
+    :
+
+.allconfig.tmp: FORCE
+       set -e; { $(call filechk_kconfig_allconfig); } > $@
+
 config: FORCE
        $(MAKE) $(kconfig) $@
 
 # Config.mk tries to include .config file, don't try to remake it
 %/.config: ;
 
-%config: FORCE
-       $(MAKE) $(kconfig) $@
+%config: .allconfig.tmp FORCE
+       $(MAKE) $(kconfig) KCONFIG_ALLCONFIG=$< $@
 
 else # !config-build
 
@@ -368,7 +382,7 @@ _clean: delete-unfresh-files
                -o -name "*.gcno" -o -name ".*.cmd" -o -name "lib.a" \) -exec 
rm -f {} \;
        rm -f include/asm $(TARGET) $(TARGET).gz $(TARGET).efi 
$(TARGET).efi.map $(TARGET)-syms $(TARGET)-syms.map *~ core
        rm -f asm-offsets.s include/asm-*/asm-offsets.h
-       rm -f .banner
+       rm -f .banner .allconfig.tmp
 
 .PHONY: _distclean
 _distclean: clean
--
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