linux-kernel - [PATCH 14/17] selftests/nolibc: add a "defconfig" target

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Message-Id: <20220719214449.2520-16-w@1wt.eu>
Date:   Tue, 19 Jul 2022 23:44:46 +0200
From:   Willy Tarreau <w@....eu>
To:     "Paul E . McKenney" <paulmck@...nel.org>
Cc:     Pranith Kumar <bobby.prani@...il.com>,
        Alviro Iskandar Setiawan <alviro.iskandar@...weeb.org>,
        Ammar Faizi <ammarfaizi2@...weeb.org>,
        David Laight <David.Laight@...LAB.COM>,
        Mark Brown <broonie@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Shuah Khan <shuah@...nel.org>, linux-kselftest@...r.kernel.org,
        linux-kernel@...r.kernel.org, Willy Tarreau <w@....eu>
Subject: [PATCH 14/17] selftests/nolibc: add a "defconfig" target

While most archs will work fine with "make defconfig", not all will
do, and it's not always easy to remember the most suitable choice to
use for a specific architecture.

This adds a "defconfig" target to the Makefile so that one may easily
run "make -C ... defconfig" and make sure to clean and rebuild a fresh
config. This is *not* used by default because we want to preserve the
user's config by default.

Signed-off-by: Willy Tarreau <w@....eu>
---
 tools/testing/selftests/nolibc/Makefile | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/tools/testing/selftests/nolibc/Makefile b/tools/testing/selftests/nolibc/Makefile
index 4a2ab0e73ce2..c104719eae8b 100644
--- a/tools/testing/selftests/nolibc/Makefile
+++ b/tools/testing/selftests/nolibc/Makefile
@@ -22,6 +22,15 @@ IMAGE_riscv   = arch/riscv/boot/Image
 IMAGE         = $(IMAGE_$(ARCH))
 IMAGE_NAME    = $(notdir $(IMAGE))
 
+# default kernel configurations that appear to be usable
+DEFCONFIG_i386    = defconfig
+DEFCONFIG_x86     = defconfig
+DEFCONFIG_arm64   = defconfig
+DEFCONFIG_arm     = multi_v7_defconfig
+DEFCONFIG_mips    = malta_defconfig
+DEFCONFIG_riscv   = defconfig
+DEFCONFIG         = $(DEFCONFIG_$(ARCH))
+
 # OUTPUT is only set when run from the main makefile, otherwise
 # it defaults to this nolibc directory.
 OUTPUT ?= $(CURDIR)/
@@ -46,6 +55,9 @@ initramfs: nolibc-test
 	$(call QUIET_INSTALL, initramfs/init)
 	$(Q)cp nolibc-test initramfs/init
 
+defconfig:
+	$(Q)$(MAKE) -C $(srctree) ARCH=$(ARCH) CC=$(CC) CROSS_COMPILE=$(CROSS_COMPILE) mrproper $(DEFCONFIG) prepare
+
 kernel: initramfs
 	$(Q)$(MAKE) -C $(srctree) ARCH=$(ARCH) CC=$(CC) CROSS_COMPILE=$(CROSS_COMPILE) $(IMAGE_NAME) CONFIG_INITRAMFS_SOURCE=$(CURDIR)/initramfs
 
-- 
2.17.5