Changes in Kbuild

8212f898 - kbuild: use more subdir- for visiting subdirectories while cleaning

Wed, 13 Oct 2021 06:36:22 +0000

kbuild: use more subdir- for visiting subdirectories while cleaningDocumentation/kbuild/makefiles.rst suggests to use "archclean" forcleaning arch/$(SRCARCH)/boot/, but it is not a hard requirement.Since commit d92cc4d51643 ("kbuild: require all architectures to havearch/$(SRCARCH)/Kbuild"), we can use the "subdir- += boot" trick forall architectures. This can take advantage of the parallel option (-j)for "make clean".I also cleaned up the comments in arch/$(SRCARCH)/Makefile. The "archdep"target no longer exists.Signed-off-by: Masahiro Yamada Reviewed-by: Kees Cook Acked-by: Geert Uytterhoeven Acked-by: Michael Ellerman (powerpc) List of files: /linux-6.15/arch/arm64/Kbuild

57d276bb - arm64: hyperv: Add Hyper-V hypercall and register access utilities

Wed, 04 Aug 2021 15:52:35 +0000

arm64: hyperv: Add Hyper-V hypercall and register access utilitieshyperv-tlfs.h defines Hyper-V interfaces from the Hyper-V Top LevelFunctional Spec (TLFS), and #includes the architecture-independentpart of hyperv-tlfs.h in include/asm-generic. The published TLFSis distinctly oriented to x86/x64, so the ARM64-specifichyperv-tlfs.h includes information for ARM64 that is not yet formallypublished. The TLFS is available here: docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/reference/tlfsmshyperv.h defines Linux-specific structures and routines forinteracting with Hyper-V on ARM64, and #includes the architecture-independent part of mshyperv.h in include/asm-generic.Use these definitions to provide utility functions to makeHyper-V hypercalls and to get and set Hyper-V providedregisters associated with a virtual processor.Signed-off-by: Michael Kelley Reviewed-by: Sunil Muthuswamy Acked-by: Marc Zyngier Acked-by: Mark Rutland Acked-by: Catalin Marinas Link: https://lore.kernel.org/r/1628092359-61351-2-git-send-email-mikelley@microsoft.comSigned-off-by: Wei Liu List of files: /linux-6.15/arch/arm64/Kbuild

6bdacdb4 - bpf: Fix BPF_JIT kconfig symbol dependency

Wed, 12 May 2021 18:57:14 +0000

bpf: Fix BPF_JIT kconfig symbol dependencyRandy reported a randconfig build error recently on i386: ld: arch/x86/net/bpf_jit_comp32.o: in function `do_jit': bpf_jit_comp32.c:(.text+0x28c9): undefined reference to `__bpf_call_base' ld: arch/x86/net/bpf_jit_comp32.o: in function `bpf_int_jit_compile': bpf_jit_comp32.c:(.text+0x3694): undefined reference to `bpf_jit_blind_constants' ld: bpf_jit_comp32.c:(.text+0x3719): undefined reference to `bpf_jit_binary_free' ld: bpf_jit_comp32.c:(.text+0x3745): undefined reference to `bpf_jit_binary_alloc' ld: bpf_jit_comp32.c:(.text+0x37d3): undefined reference to `bpf_jit_prog_release_other' [...]The cause was that b24abcff918a ("bpf, kconfig: Add consolidated menu entry forbpf with core options") moved BPF_JIT from net/Kconfig into kernel/bpf/Kconfigand previously BPF_JIT was guarded by a 'if NET'. However, there is no actualdependency on NET, it's just that menuconfig NET selects BPF. And the latter inturn causes kernel/bpf/core.o to be built which contains above symbols. Randy'srandconfig didn't have NET set, and BPF wasn't either, but BPF_JIT otoh was.Detangle this by making BPF_JIT depend on BPF instead. arm64 was the only archthat pulled in its JIT in net/ via obj-$(CONFIG_NET), all others unconditionallypull this dir in via obj-y. Do the same since CONFIG_NET guard there is reallyuseless as we compiled the JIT via obj-$(CONFIG_BPF_JIT) += bpf_jit_comp.o anyway.Fixes: b24abcff918a ("bpf, kconfig: Add consolidated menu entry for bpf with core options")Reported-by: Randy Dunlap Signed-off-by: Daniel Borkmann Acked-by: Randy Dunlap Tested-by: Randy Dunlap List of files: /linux-6.15/arch/arm64/Kbuild

6bfa3134 - arm64: add arch/arm64/Kbuild

Wed, 21 Aug 2019 09:11:17 +0000

arm64: add arch/arm64/KbuildUse the standard obj-y form to specify the sub-directories underarch/arm64/. No functional change intended.Signed-off-by: Masahiro Yamada Signed-off-by: Will Deacon List of files: /linux-6.15/arch/arm64/Kbuild