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The arm64 kernel doesn't boot with annotated branches (PROFILE_ANNOTATED_BRANCHES) enabled and CONFIG_DEBUG_VIRTUAL together. Bisecting it, I found that disabling branch profiling in arch/arm64/mm solved the problem. Narrowing down a bit further, I found that physaddr.c is the file that needs to have branch profiling disabled to get the machine to boot. I suspect that it might invoke some ftrace helper very early in the boot process and ftrace is still not enabled(!?). Rather than playing whack-a-mole with individual files, disable branch profiling for the entire arch/arm64 tree, similar to what x86 already does in arch/x86/Kbuild. Cc: stable@vger.kernel.org Signed-off-by: Breno Leitao <leitao@debian.org> Acked-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Will Deacon <will@kernel.org>
13 lines
347 B
Makefile
13 lines
347 B
Makefile
# SPDX-License-Identifier: GPL-2.0-only
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# Branch profiling isn't noinstr-safe
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subdir-ccflags-$(CONFIG_TRACE_BRANCH_PROFILING) += -DDISABLE_BRANCH_PROFILING
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obj-y += kernel/ mm/ net/
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obj-$(CONFIG_KVM) += kvm/
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obj-$(CONFIG_XEN) += xen/
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obj-$(subst m,y,$(CONFIG_HYPERV)) += hyperv/
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obj-$(CONFIG_CRYPTO) += crypto/
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# for cleaning
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subdir- += boot
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