Hello. This should "fix" the kernel crash observed by Dave.
But let me repeat once again, the problem is that fpu_finit() is buggy on Dave's machine. This series should "hide" this problem, we need to fix it later anyway. I was going to do these changes anyway, math_state_restore() was only used because we did not have the necessary helpers. I was going to start with init_fpu() cleanups, but since math_state_restore() makes this fpu_finit() bug more visible lets remove it first. Note that init_fpu() + user_fpu_begin() is racy, used_math() is already set so __switch_to() in between can do restore_fpu_checking() too and trigger the same GPF. But this is fine (to some degree), the task won't be killed. And this is just another proof that init_fpu() should not set used_math() and it and its users need more cleanups. More to come tomorrow. Oleg. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
