lkml.org 
[lkml]   [2020]   [Mar]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: linux-next: Tree for Mar 25 (arch/x86/kvm/)
On Wed, Mar 25, 2020 at 05:26:20PM +0100, Paolo Bonzini wrote:
> On 25/03/20 17:14, Sean Christopherson wrote:
> >> Doh, right. I think the only solution for that one is to degrade it to
> >> WARN_ON(1).
> > I reproduced the error, give me a bit to play with the code to see if the
> > BUILD_BUG can be preserved. I'm curious as to why kvm_cpu_cap_mask() is
> > special, and why it only fails with this config.
> >
>
> I could not reproduce it, but I would not be surprised if there are
> other configurations where the compiler cannot constant-propagate from
> the reverse_cpuid struct into __cpuid_entry_get_reg.

The error is related to UBSAN. There is at least one legitimate (but benign)
underlying issue. I'm chasing down a second instance of the BUILD_BUG.

Assuming all issues can be fixed, I think it'd make sense to keep the
BUILD_BUG, especially if it's teasing out actual weirdness, even if the
weirdness is benign.

\
 
 \ /
  Last update: 2020-03-25 17:46    [W:0.048 / U:27.168 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site