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Vineet Gupta
8aa9e85ada
There was a very small race window where resume to kernel mode from a Exception Path (or pure kernel mode which is true for most of ARC exceptions anyways), was not disabling interrupts in restore_regs, clobbering the exception regs Anton found the culprit call flow (after many sleepless nights) | 1. we got a Trap from user land | 2. started to service it. | 3. While doing some stuff on user-land memory (I think it is padzero()), | we got a DataTlbMiss | 4. On return from it we are taking "resume_kernel_mode" path | 5. NEED_RESHED is not set, so we go to "return from exception" path in | restore regs. | 6. there seems to be IRQ happening Signed-off-by: Vineet Gupta <[email protected]> Cc: <[email protected]> #3.10, 3.12, 3.13, 3.14 Cc: Anton Kolesov <[email protected]> Cc: Francois Bedard <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>