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From: Denis Nikitin <denik@chromium.org>
To: Marc Zyngier <maz@kernel.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>
Cc: James Morse <james.morse@arm.com>,
	Alexandru Elisei <alexandru.elisei@arm.com>,
	Nick Desaulniers <ndesaulniers@google.com>,
	Manoj Gupta <manojgupta@google.com>,
	David Brazdil <dbrazdil@google.com>,
	linux-arm-kernel@lists.infradead.org,
	kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org,
	Denis Nikitin <denik@chromium.org>
Subject: [PATCH] KVM: arm64: nvhe: Disable profile optimization
Date: Tue, 20 Sep 2022 01:20:05 -0700	[thread overview]
Message-ID: <20220920082005.2459826-1-denik@chromium.org> (raw)

Kernel build with -fprofile-sample-use raises the following failure:

error: arch/arm64/kvm/hyp/nvhe/kvm_nvhe.tmp.o: Unexpected SHT_REL
section ".rel.llvm.call-graph-profile"

SHT_REL is generated by the latest lld, see
https://reviews.llvm.org/rGca3bdb57fa1ac98b711a735de048c12b5fdd8086.
Disable profile optimization in kvm/nvhe to fix the build with
AutoFDO.

Signed-off-by: Denis Nikitin <denik@chromium.org>
---
 arch/arm64/kvm/hyp/nvhe/Makefile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile
index b5c5119c7396..6a6188374a52 100644
--- a/arch/arm64/kvm/hyp/nvhe/Makefile
+++ b/arch/arm64/kvm/hyp/nvhe/Makefile
@@ -89,6 +89,9 @@ quiet_cmd_hypcopy = HYPCOPY $@
 # Remove ftrace, Shadow Call Stack, and CFI CFLAGS.
 # This is equivalent to the 'notrace', '__noscs', and '__nocfi' annotations.
 KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS) $(CC_FLAGS_CFI), $(KBUILD_CFLAGS))
+# Profile optimization creates SHT_REL section '.llvm.call-graph-profile' for
+# the hot code. SHT_REL is currently not supported by the KVM tools.
+KBUILD_CFLAGS += $(call cc-option,-fno-profile-sample-use,-fno-profile-use)
 
 # KVM nVHE code is run at a different exception code with a different map, so
 # compiler instrumentation that inserts callbacks or checks into the code may
-- 
2.37.3.968.ga6b4b080e4-goog


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             reply	other threads:[~2022-09-20  8:22 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-09-20  8:20 Denis Nikitin [this message]
2022-09-20  9:33 ` [PATCH] KVM: arm64: nvhe: Disable profile optimization Marc Zyngier
2022-09-21  0:08   ` Denis Nikitin
2022-09-21  6:02     ` Denis Nikitin
2022-09-21 17:25       ` Marc Zyngier
2022-09-22  5:31 ` [PATCH v2] KVM: arm64: nvhe: Fix build with " Denis Nikitin
2022-09-22 10:37   ` Marc Zyngier
2022-09-23  5:01     ` Denis Nikitin
     [not found]       ` <CAH=Qcsi3aQ51AsAE0WmAH9VmpqjOaQQt=ru5Nav4+d8F3fMPwQ@mail.gmail.com>
2022-09-29 16:13         ` Denis Nikitin
2022-10-06 16:28           ` Denis Nikitin
2022-10-09  2:20             ` Marc Zyngier
2022-10-11  2:15               ` Denis Nikitin
2022-10-13 11:09                 ` Marc Zyngier
2022-10-13 19:02                   ` Denis Nikitin

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