Re: [BK-2.5] Move "used FPU status" into new non-atomic thread_info->status

[Mikael Pettersson]

Linus Torvalds writes:
 > > Sorry for being dense, but can you clarify: will current 2.{2,4,5}
 > > kernels preserve or destroy the parent process' FPU control at fork()?
 > 
 > They're guaranteed to preserve the control state (it has to: you can't 
 > just change the exception mask over a function call). However, that was 
 > buggy at least in 2.5.x, and very possibly in 2.4.x too - haven't checked.

Thanks. Our use of unmasked FPU exceptions should be safe then, unless
2.4 also has the bug you fixed in 2.5.

/Mikael