On Wed, Feb 19, 2020 at 9:13 AM Borislav Petkov <bp@xxxxxxxxx> wrote: > > On Wed, Feb 19, 2020 at 03:47:26PM +0100, Peter Zijlstra wrote: > > Subject: Re: [PATCH v3 02/22] x86,mce: Delete ist_begin_non_atomic() > > x86/mce: ... > > > It is an abomination; and in prepration of removing the whole > > ist_enter() thing, it needs to go. > > > > Convert #MC over to using task_work_add() instead; it will run the > > same code slightly later, on the return to user path of the same > > exception. > > That's fine because the error happened in userspace. Unless there is a signal pending and the signal setup code is about to hit the same failed memory. I suppose we can just treat cases like this as "oh well, time to kill the whole system". But we should genuinely agree that we're okay with deferring this handling.
