From b584bfbd7ec417f257f651cc00a90c66e31dfbf1 Mon Sep 17 00:00:00 2001 From: Nathan Chancellor Date: Wed, 14 Jan 2026 16:27:11 -0700 Subject: [PATCH] ACPI: APEI: GHES: Disable KASAN instrumentation when compile testing with clang < 18 After a recent innocuous change to drivers/acpi/apei/ghes.c, building ARCH=arm64 allmodconfig with clang-17 or older (which has both CONFIG_KASAN=y and CONFIG_WERROR=y) fails with: drivers/acpi/apei/ghes.c:902:13: error: stack frame size (2768) exceeds limit (2048) in 'ghes_do_proc' [-Werror,-Wframe-larger-than] 902 | static void ghes_do_proc(struct ghes *ghes, | ^ A KASAN pass that removes unneeded stack instrumentation, enabled by default in clang-18 [1], drastically improves stack usage in this case. To avoid the warning in the common allmodconfig case when it can break the build, disable KASAN for ghes.o when compile testing with clang-17 and older. Disabling KASAN outright may hide legitimate runtime issues, so live with the warning in that case; the user can either increase the frame warning limit or disable -Werror, which they should probably do when debugging with KASAN anyways. Closes: https://github.com/ClangBuiltLinux/linux/issues/2148 Link: https://github.com/llvm/llvm-project/commit/51fbab134560ece663517bf1e8c2a30300d08f1a [1] Signed-off-by: Nathan Chancellor Cc: All applicable Link: https://patch.msgid.link/20260114-ghes-avoid-wflt-clang-older-than-18-v1-1-9c8248bfe4f4@kernel.org Signed-off-by: Rafael J. Wysocki --- drivers/acpi/apei/Makefile | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/acpi/apei/Makefile b/drivers/acpi/apei/Makefile index 5db61dfb46915..1a0b85923cd42 100644 --- a/drivers/acpi/apei/Makefile +++ b/drivers/acpi/apei/Makefile @@ -1,6 +1,10 @@ # SPDX-License-Identifier: GPL-2.0 obj-$(CONFIG_ACPI_APEI) += apei.o obj-$(CONFIG_ACPI_APEI_GHES) += ghes.o +# clang versions prior to 18 may blow out the stack with KASAN +ifeq ($(CONFIG_COMPILE_TEST)_$(CONFIG_CC_IS_CLANG)_$(call clang-min-version, 180000),y_y_) +KASAN_SANITIZE_ghes.o := n +endif obj-$(CONFIG_ACPI_APEI_PCIEAER) += ghes_helpers.o obj-$(CONFIG_ACPI_APEI_EINJ) += einj.o einj-y := einj-core.o -- 2.47.3