6a440fc3e0
labeled iretq instruction. Suppose that multithreaded process executes two threads, currently scheduled on different processors. Let assume that thread A executes using %cs or %ss pointing into the descriptor from LDT. If IPI comes which handler does not return by jump to doreti, and meantime thread B invalidates descriptor pointed to by %cs or %ss, then iretq from IPI handler could fault. Routing the return by doreti_iret allows kernel to catch the situation and recover from it by sending signal to the usermode. Tested by: pho MFC after: 1 week |
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| acpica | ||
| amd64 | ||
| compile | ||
| conf | ||
| ia32 | ||
| include | ||
| linux32 | ||
| pci | ||
| Makefile | ||