Messages in this thread | | | From | "Luck, Tony" <> | Subject | RE: [PATCH v2 1/2] x86/split_lock: Make life miserable for split lockers | Date | Thu, 17 Mar 2022 22:40:16 +0000 |
| |
> They are actually more likely to happen in the kernel > when code casts int[] to long[] and then uses the 'BIT' functions to > set/clear bits - which do locked operations. > Quite often then don't need the locks anyway. > And that cast is surprisingly common and completely broken on BE.
Default split lock mode is "kernel dies". We had to fix up a dozen or so places (mostly involving set_bit/clr_bit as you describe). But all Ice Lake. Tiger Lake and Alder Lake systems are running in that mode ... and we haven't heard of widespread death (or disabling the boot option).
-Tony
| |