On 2019-05-07 10:35:25 [-0700], Linus Torvalds wrote: > Has this gone through lots of testing, particularly with things like > FP signal handling and old machines that don't necessarily have > anything but the most basic FP state (ie Pentium class etc)?
I tried it in qemu with incremental FPU capabilities so it went through all the possible load/restore variants during signal handling. I had a testcase which did SHA1 computation and a received a SIGALRM every second. This caught some bugs, most of them were xsave/xsaves related once the SHA1 result did not match. I tried something similar one the 8087 FPU. I had the series in the v5.0-RT tree which resulted in the most recent patch in that branch. > Linus Sebastian