On Fri, Jun 21, 2024 at 04:21:49PM +0100, Jiaxun Yang wrote:
> Does anyone reckon the reason behind opt-out LLSC for IP28? As far as I understand
> there is no restriction on using LLSC after workaround being applied. If it's purely
> performance reason, I think I'll need to move kernel_uses_llsc logic to Kconfig as well.
commit 46dd40aa376c8158b6aa17510079caf5c3af6237
Author: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
Date: Wed Oct 7 12:17:04 2020 +0200
MIPS: SGI-IP28: disable use of ll/sc in kernel
SGI-IP28 systems only use broken R10k rev 2.5 CPUs, which could lock
up, if ll/sc sequences are issued in certain order. Since those systems
are all non-SMP, we can disable ll/sc usage in kernel.
Signed-off-by: Thomas Bogendoerfer <tsbogend@xxxxxxxxxxxxxxxx>
Thomas.
--
Crap can work. Given enough thrust pigs will fly, but it's not necessarily a
good idea. [ RFC1925, 2.3 ]
