linux/Makefile, branch v6.2

Linux 6.2

2023-02-19T22:24:22Z

Linux 6.2-rc8

2023-02-12T22:10:17Z

Linux 6.2-rc7

2023-02-05T21:13:28Z

Linux 6.2-rc6

2023-01-29T21:59:43Z

Linux 6.2-rc5

2023-01-22T00:27:01Z

Merge tag 'kbuild-fixes-v6.2-3' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

2023-01-21T18:56:37Z

Pull Kbuild fixes from Masahiro Yamada: - Hide LDFLAGS_vmlinux from decompressor Makefiles to fix error messages when GNU Make 4.4 is used. - Fix 'make modules' build error when CONFIG_DEBUG_INFO_BTF_MODULES=y. - Fix warnings emitted by GNU Make 4.4 in scripts/kconfig/Makefile. - Support GNU Make 4.4 for scripts/jobserver-exec. - Show clearer error message when kernel/gen_kheaders.sh fails due to missing cpio. * tag 'kbuild-fixes-v6.2-3' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: kheaders: explicitly validate existence of cpio command scripts: support GNU make 4.4 in jobserver-exec kconfig: Update all declared targets scripts: rpm: make clear that mkspec script contains 4.13 feature init/Kconfig: fix LOCALVERSION_AUTO help text kbuild: fix 'make modules' error when CONFIG_DEBUG_INFO_BTF_MODULES=y kbuild: export top-level LDFLAGS_vmlinux only to scripts/Makefile.vmlinux init/version-timestamp.c: remove unneeded #include docs: kbuild: remove mention to dropped $(objtree) feature

Linux 6.2-rc4

2023-01-15T15:22:43Z

kbuild: fix 'make modules' error when CONFIG_DEBUG_INFO_BTF_MODULES=y

2023-01-10T19:23:32Z

When CONFIG_DEBUG_INFO_BTF_MODULES=y, running 'make modules' in the clean kernel tree will get the following error. $ grep CONFIG_DEBUG_INFO_BTF_MODULES .config CONFIG_DEBUG_INFO_BTF_MODULES=y $ make -s clean $ make modules [snip] AR vmlinux.a ar: ./built-in.a: No such file or directory make: *** [Makefile:1241: vmlinux.a] Error 1 'modules' depends on 'vmlinux', but builtin objects are not built. Define KBUILD_BUILTIN. Fixes: f73edc8951b2 ("kbuild: unify two modpost invocations") Signed-off-by: Masahiro Yamada

kbuild: export top-level LDFLAGS_vmlinux only to scripts/Makefile.vmlinux

2023-01-10T19:22:12Z

Nathan Chancellor reports that $(NM) emits an error message when GNU Make 4.4 is used to build the ARM zImage. $ make-4.4 ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- O=build defconfig zImage [snip] LD vmlinux NM System.map SORTTAB vmlinux OBJCOPY arch/arm/boot/Image Kernel: arch/arm/boot/Image is ready arm-linux-gnueabi-nm: 'arch/arm/boot/compressed/../../../../vmlinux': No such file /bin/sh: 1: arithmetic expression: expecting primary: " " LDS arch/arm/boot/compressed/vmlinux.lds AS arch/arm/boot/compressed/head.o GZIP arch/arm/boot/compressed/piggy_data AS arch/arm/boot/compressed/piggy.o CC arch/arm/boot/compressed/misc.o This occurs since GNU Make commit 98da874c4303 ("[SV 10593] Export variables to $(shell ...) commands"), and the O= option is needed to reproduce it. The generated zImage is correct despite the error message. As the commit description of 98da874c4303 [1] says, exported variables are passed down to $(shell ) functions, which means exported recursive variables might be expanded earlier than before, in the parse stage. The following test code demonstrates the change for GNU Make 4.4. [Test Makefile] $(shell echo hello > foo) export foo = $(shell cat bar/../foo) $(shell mkdir bar) all: @echo $(foo) [GNU Make 4.3] $ rm -rf bar; make-4.3 hello [GNU Make 4.4] $ rm -rf bar; make-4.4 cat: bar/../foo: No such file or directory hello The 'foo' is a resursively expanded (i.e. lazily expanded) variable. GNU Make 4.3 expands 'foo' just before running the recipe '@echo $(foo)', at this point, the directory 'bar' exists. GNU Make 4.4 expands 'foo' to evaluate $(shell mkdir bar) because it is exported. At this point, the directory 'bar' does not exit yet. The cat command cannot resolve the bar/../foo path, hence the error message. Let's get back to the kernel Makefile. In arch/arm/boot/compressed/Makefile, KBSS_SZ is referenced by LDFLAGS_vmlinux, which is recursive and also exported by the top Makefile. GNU Make 4.3 expands KBSS_SZ just before running the recipes, so no error message. GNU Make 4.4 expands KBSS_SZ in the parse stage, where the directory arm/arm/boot/compressed does not exit yet. When compiled with O=, the output directory is created by $(shell mkdir -p $(obj-dirs)) in scripts/Makefile.build. There are two ways to fix this particular issue: - change "$(obj)/../../../../vmlinux" in KBSS_SZ to "vmlinux" - unexport LDFLAGS_vmlinux This commit takes the latter course because it is what I originally intended. Commit 3ec8a5b33dea ("kbuild: do not export LDFLAGS_vmlinux") unexported LDFLAGS_vmlinux. Commit 5d4aeffbf709 ("kbuild: rebuild .vmlinux.export.o when its prerequisite is updated") accidentally exported it again. We can clean up arch/arm/boot/compressed/Makefile later. [1]: https://git.savannah.gnu.org/cgit/make.git/commit/?id=98da874c43035a490cdca81331724f233a3d0c9a Link: https://lore.kernel.org/all/Y7i8+EjwdnhHtlrr@dev-arch.thelio-3990X/ Fixes: 5d4aeffbf709 ("kbuild: rebuild .vmlinux.export.o when its prerequisite is updated") Reported-by: Nathan Chancellor Signed-off-by: Masahiro Yamada Reviewed-by: Nicolas Schier Tested-by: Nathan Chancellor

Linux 6.2-rc3

2023-01-08T17:49:43Z