On Mon, Feb 07, 2022 at 03:20:43PM +0000, Mark Brown wrote: > The Scalable Matrix Extension introduces support for a new thread specific > data register TPIDR2 intended for use by libc. The kernel must save the > value of TPIDR2 on context switch and should ensure that all new threads > start off with a default value of 0. Add a field to the thread_struct to > store TPIDR2 and context switch it with the other thread specific data. > > In case there are future extensions which also use TPIDR2 we introduce > system_supports_tpidr2() and use that rather than system_supports_sme() > for TPIDR2 handling. > > Signed-off-by: Mark Brown <broonie@xxxxxxxxxx> I think this matches the ABI per the documentation (and the subsequent discussion we had). Reviewed-by: Catalin Marinas <catalin.marinas@xxxxxxx>
