diff options
| author | Nathan Chancellor <nathan@kernel.org> | 2026-01-14 16:27:11 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2026-03-13 17:20:37 +0100 |
| commit | 8cad5463aec660e6b4016eec393df514aa1ab9d7 (patch) | |
| tree | 9b9c87973a7511c712a78ed18f76b7e72d5d044b | |
| parent | 400989c54567498d454c00774869ee0607fad1ed (diff) | |
ACPI: APEI: GHES: Disable KASAN instrumentation when compile testing with clang < 18
[ Upstream commit b584bfbd7ec417f257f651cc00a90c66e31dfbf1 ]
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 <nathan@kernel.org>
Cc: All applicable <stable@vger.kernel.org>
Link: https://patch.msgid.link/20260114-ghes-avoid-wflt-clang-older-than-18-v1-1-9c8248bfe4f4@kernel.org
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | drivers/acpi/apei/Makefile | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/acpi/apei/Makefile b/drivers/acpi/apei/Makefile index 2c474e6477e1..346cdf0a0ef9 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_EINJ) += einj.o einj-y := einj-core.o einj-$(CONFIG_ACPI_APEI_EINJ_CXL) += einj-cxl.o |