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9170fc1ddc
ipi_drop_fpstate() needs to check if the current fpu context matches the expected one sent via IPI. Only after that %fprs should be cleared. Use the same asm in ipi_drop_fpstate() as in the start of ipi_save_fpstate(). Also simplify ipi_drop_fpstate() and clearfpstate() since there is no need to enable the FPU before clearing %fprs. OK miod@ kettenis@ deraadt@