KVM: allow disabling -Werror

Restrict -Werror to well-tested configurations and allow disabling it
via Kconfig.

Reported-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
index 991019d..1bb4927 100644 (file)
--- a/arch/x86/kvm/Kconfig
+++ b/arch/x86/kvm/Kconfig
@@ -59,6 +59,19 @@ config KVM
 
          If unsure, say N.
 
+config KVM_WERROR
+       bool "Compile KVM with -Werror"
+       # KASAN may cause the build to fail due to larger frames
+       default y if X86_64 && !KASAN
+       # We use the dependency on !COMPILE_TEST to not be enabled
+       # blindly in allmodconfig or allyesconfig configurations
+       depends on (X86_64 && !KASAN) || !COMPILE_TEST
+       depends on EXPERT
+       help
+         Add -Werror to the build flags for (and only for) i915.ko.
+
+         If in doubt, say "N".
+
 config KVM_INTEL
        tristate "KVM for Intel (and compatible) processors support"
        depends on KVM && IA32_FEAT_CTL

diff --git a/arch/x86/kvm/Makefile b/arch/x86/kvm/Makefile
index 4654e97..e553f0f 100644 (file)
--- a/arch/x86/kvm/Makefile
+++ b/arch/x86/kvm/Makefile
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0
 
 ccflags-y += -Iarch/x86/kvm
-ccflags-y += -Werror
+ccflags-$(CONFIG_KVM_WERROR) += -Werror
 
 KVM := ../../../virt/kvm