From: Peng Hao <flyingpeng@xxxxxxxxxxx>
When building kernel with clang, which will typically
have sanitizers enabled, there is a warning about a large stack frame.
arch/x86/kvm/emulate.c:3022:5: error: stack frame size (2520) exceeds limit (2048)
in 'emulator_task_switch' [-Werror,-Wframe-larger-than]
int emulator_task_switch(struct x86_emulate_ctxt *ctxt,
^
599/2520 (23.77%) spills, 1921/2520 (76.23%) variables
so increase the limit for configurations that have KASAN or KCSAN enabled for not
breaking the majority of builds.
Signed-off-by: Peng Hao <flyingpeng@xxxxxxxxxxx>
---
arch/x86/kvm/Makefile | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile
index addc44fc7187..2165262c1497 100644
--- a/arch/x86/kvm/Makefile
+++ b/arch/x86/kvm/Makefile
@@ -5,6 +5,12 @@ ccflags-$(CONFIG_KVM_WERROR) += -Werror
include $(srctree)/virt/kvm/Makefile.kvm
+ifneq ($(CONFIG_FRAME_WARN),0)
+ifeq ($(filter y,$(CONFIG_KASAN)$(CONFIG_KCSAN)),y)
+CFLAGS_emulate.o = -Wframe-larger-than=2520
+endif
+endif
+
kvm-y += x86.o emulate.o i8259.o irq.o lapic.o \
i8254.o ioapic.o irq_comm.o cpuid.o pmu.o mtrr.o \
debugfs.o mmu/mmu.o mmu/page_track.o \
--
2.27.0
