linux-kernel - Re: [git pull] drm for 6.10-rc1

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Date: Thu, 16 May 2024 07:22:04 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Dave Airlie <airlied@...il.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>, 
	Jani Nikula <jani.nikula@...ux.intel.com>, Jani Nikula <jani.nikula@...el.com>, 
	Daniel Vetter <daniel.vetter@...ll.ch>, dri-devel <dri-devel@...ts.freedesktop.org>, 
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [git pull] drm for 6.10-rc1

On Thu, May 16, 2024, Dave Airlie wrote:
> On Thu, 16 May 2024 at 08:56, Linus Torvalds <torvalds@...ux-foundation.org> wrote:
> > If the *main* CONFIG_WERROR is on, then it does NOT MATTER if somebody
> > sets CONFIG_DRM_WERROR or not. It's a no-op. It's pointless.

+1

> It's also possible it's just that hey there's a few others in the tree
> 
> KVM_WERROR not tied to it
> PPC_WERROR (why does CXL uses this?)
> AMDGPU, I915 and XE all have !COMPILE_TEST on their variants
> 
> We should probably add !WERROR to all of these at this point.

That creates its own weirdness though, e.g. I guarantee I'll forget about the
global WERROR at some point and wonder why I'm seeing -Werror despite having
KVM_WERROR=n in my .config.  I would rather force KVM_WERROR if WERROR=y, so this?

diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig
index 2a7f69abcac3..75082c4a9ac4 100644
--- a/arch/x86/kvm/Kconfig
+++ b/arch/x86/kvm/Kconfig
@@ -44,6 +44,7 @@ config KVM
        select KVM_VFIO
        select HAVE_KVM_PM_NOTIFIER if PM
        select KVM_GENERIC_HARDWARE_ENABLING
+       select KVM_WERROR if WERROR
        help
          Support hosting fully virtualized guest machines using hardware
          virtualization extensions.  You will need a fairly recent
@@ -66,7 +67,7 @@ config KVM_WERROR
        # FRAME_WARN, i.e. KVM_WERROR=y with KASAN=y requires special tuning.
        # Building KVM with -Werror and KASAN is still doable via enabling
        # the kernel-wide WERROR=y.
-       depends on KVM && EXPERT && !KASAN
+       depends on KVM && ((EXPERT && !KASAN) || WERROR)
        help
          Add -Werror to the build flags for KVM.