FAILED: Patch "ACPI: APEI: GHES: Disable KASAN instrumentation when compile testing with clang < 18" failed to apply to 6.6-stable tree

The patch below does not apply to the 6.6-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

Thanks,
Sasha

------------------ original commit in Linus's tree ------------------

From b584bfbd7ec417f257f651cc00a90c66e31dfbf1 Mon Sep 17 00:00:00 2001
From: Nathan Chancellor <[email protected]>
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.

---
 drivers/acpi/apei/Makefile | 4 ++++
 1 file changed, 4 insertions(+)

index 5db61dfb46915..1a0b85923cd42 100644
@@ -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

2.51.0