On Fri, 25 Sep 2020 17:12:45 +0200 Greg Kroah-Hartman gregkh@linuxfoundation.org wrote:
Specifically, commits:
a0d14b8909de55139b8702fe0c7e80b69763dcfb ("x86/mm, tracing: Fix CR2 corruption") 6879298bd0673840cadd1fb36d7225485504ceb4 ("x86/entry/64: Prevent clobbering of saved CR2 value") b8f70953c1251d8b16276995816a95639f598e70 ("x86/entry/32: Pass cr2 to do_async_page_fault()")
(which are in 5.4 but not 4.19)
But again, is this too intrusive. There was a workaround that was original proposed, but Peter didn't want any more band-aids, and did the restructuring, but as you can see from the two other patches, it makes it a bit more high risk.
If those are known to work, why can't I take them as-is?
If they apply without tweaks, I say "Go for it" ;-)
My worry is that they may have other unknown dependencies. And I only looked at what was applied between 4.19 and 5.4 mainline. I haven't looked at what else may have been backported to fix the above three commits.
-- Steve