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Message-Id: <20230916-nolibc-initramfs-v1-2-4416ecedca6d@weissschuh.net>
Date: Sat, 16 Sep 2023 09:13:28 +0200
From: Thomas Weißschuh <linux@...ssschuh.net>
To: Masahiro Yamada <masahiroy@...nel.org>,
Nathan Chancellor <nathan@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Nicolas Schier <nicolas@...sle.eu>, Willy Tarreau <w@....eu>,
Shuah Khan <shuah@...nel.org>
Cc: linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-kselftest@...r.kernel.org,
Thomas Weißschuh <linux@...ssschuh.net>
Subject: [PATCH RFC 2/3] selftests/nolibc: don't embed initramfs into
kernel image
When the initramfs is embedded into the kernel each rebuild of it will
trigger a full kernel relink and all the expensive postprocessing steps.
Currently nolibc-test and therefore the initramfs are always rebuild,
even without source changes, leading to lots of slow kernel relinks.
Instead of linking the initramfs into the kernel assemble it manually
and pass it explicitly to qemu.
This avoids all of the kernel relinks.
Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>
---
tools/testing/selftests/nolibc/Makefile | 47 +++++++++++++++++----------------
1 file changed, 24 insertions(+), 23 deletions(-)
diff --git a/tools/testing/selftests/nolibc/Makefile b/tools/testing/selftests/nolibc/Makefile
index 689658f81a19..c62efc62a060 100644
--- a/tools/testing/selftests/nolibc/Makefile
+++ b/tools/testing/selftests/nolibc/Makefile
@@ -131,18 +131,18 @@ REPORT ?= awk '/\[OK\][\r]*$$/{p++} /\[FAIL\][\r]*$$/{if (!f) printf("\n"); f++
help:
@echo "Supported targets under selftests/nolibc:"
- @echo " all call the \"run\" target below"
- @echo " help this help"
- @echo " sysroot create the nolibc sysroot here (uses \$$ARCH)"
- @echo " nolibc-test build the executable (uses \$$CC and \$$CROSS_COMPILE)"
- @echo " libc-test build an executable using the compiler's default libc instead"
- @echo " run-user runs the executable under QEMU (uses \$$XARCH, \$$TEST)"
- @echo " initramfs prepare the initramfs with nolibc-test"
- @echo " defconfig create a fresh new default config (uses \$$XARCH)"
- @echo " kernel (re)build the kernel with the initramfs (uses \$$XARCH)"
- @echo " run runs the kernel in QEMU after building it (uses \$$XARCH, \$$TEST)"
- @echo " rerun runs a previously prebuilt kernel in QEMU (uses \$$XARCH, \$$TEST)"
- @echo " clean clean the sysroot, initramfs, build and output files"
+ @echo " all call the \"run\" target below"
+ @echo " help this help"
+ @echo " sysroot create the nolibc sysroot here (uses \$$ARCH)"
+ @echo " nolibc-test build the executable (uses \$$CC and \$$CROSS_COMPILE)"
+ @echo " libc-test build an executable using the compiler's default libc instead"
+ @echo " run-user runs the executable under QEMU (uses \$$XARCH, \$$TEST)"
+ @echo " initramfs.cpio prepare the initramfs with nolibc-test"
+ @echo " defconfig create a fresh new default config (uses \$$XARCH)"
+ @echo " kernel (re)build the kernel with the initramfs (uses \$$XARCH)"
+ @echo " run runs the kernel in QEMU after building it (uses \$$XARCH, \$$TEST)"
+ @echo " rerun runs a previously prebuilt kernel in QEMU (uses \$$XARCH, \$$TEST)"
+ @echo " clean clean the sysroot, initramfs, build and output files"
@echo ""
@echo "The output file is \"run.out\". Test ranges may be passed using \$$TEST."
@echo ""
@@ -195,25 +195,26 @@ run-user: nolibc-test
$(Q)qemu-$(QEMU_ARCH) ./nolibc-test > "$(CURDIR)/run.out" || :
$(Q)$(REPORT) $(CURDIR)/run.out
-initramfs: nolibc-test
- $(QUIET_MKDIR)mkdir -p initramfs
- $(call QUIET_INSTALL, initramfs/init)
- $(Q)cp nolibc-test initramfs/init
+$(srctree)/usr/gen_init_cpio:
+ $(Q)$(MAKE) -C $(srctree) usr_gen_init_cpio
+
+initramfs.cpio: $(srctree)/usr/gen_init_cpio nolibc-test
+ $(QUIET_GEN)echo 'file /init nolibc-test 755 0 0' | $(srctree)/usr/gen_init_cpio - > initramfs.cpio
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
+kernel:
+ $(Q)$(MAKE) -C $(srctree) ARCH=$(ARCH) CC=$(CC) CROSS_COMPILE=$(CROSS_COMPILE) $(IMAGE_NAME)
# run the tests after building the kernel
-run: kernel
- $(Q)qemu-system-$(QEMU_ARCH) -display none -no-reboot -kernel "$(srctree)/$(IMAGE)" -serial stdio $(QEMU_ARGS) > "$(CURDIR)/run.out"
+run: kernel initramfs.cpio
+ qemu-system-$(QEMU_ARCH) -display none -no-reboot -kernel "$(srctree)/$(IMAGE)" -initrd initramfs.cpio -serial stdio $(QEMU_ARGS) > "$(CURDIR)/run.out"
$(Q)$(REPORT) $(CURDIR)/run.out
# re-run the tests from an existing kernel
rerun:
- $(Q)qemu-system-$(QEMU_ARCH) -display none -no-reboot -kernel "$(srctree)/$(IMAGE)" -serial stdio $(QEMU_ARGS) > "$(CURDIR)/run.out"
+ $(Q)qemu-system-$(QEMU_ARCH) -display none -no-reboot -kernel "$(srctree)/$(IMAGE)" -initrd initramfs.cpio -serial stdio $(QEMU_ARGS) > "$(CURDIR)/run.out"
$(Q)$(REPORT) $(CURDIR)/run.out
# report with existing test log
@@ -227,8 +228,8 @@ clean:
$(Q)rm -f nolibc-test
$(call QUIET_CLEAN, libc-test)
$(Q)rm -f libc-test
- $(call QUIET_CLEAN, initramfs)
- $(Q)rm -rf initramfs
+ $(call QUIET_CLEAN, initramfs.cpio)
+ $(Q)rm -rf initramfs.cpio
$(call QUIET_CLEAN, run.out)
$(Q)rm -rf run.out
--
2.42.0
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