[PATCH 3.12 50/84] arm64: debug: avoid resetting stepping state machine when TIF_SINGLESTEP

From: Will Deacon 3.12-stable review patch. If anyone has any objections, please let me know. === commit 3a402a709500c5a3faca2111668c33d96555e35a upstream. When TIF_SINGLESTEP is set for a task, the single-step state machine is enabled and we must take care

[PATCH 3.12 50/84] arm64: debug: avoid resetting stepping state machine when TIF_SINGLESTEP

From: Will Deacon 3.12-stable review patch. If anyone has any objections, please let me know. === commit 3a402a709500c5a3faca2111668c33d96555e35a upstream. When TIF_SINGLESTEP is set for a task, the single-step state machine is enabled and we must take care not to reset it to the