arm64: Clear out any singlestep state on a ptrace detach operation
Make sure to clear out any ptrace singlestep state when a ptrace(2) PTRACE_DETACH call is made on arm64 systems. Otherwise, the previously ptraced task will die off with a SIGTRAP signal if the debugger just previously singlestepped the ptraced task. Cc: <stable@vger.kernel.org> Signed-off-by:John Blackwood <john.blackwood@ccur.com> [will: added comment to justify why this is in the arch code] Signed-off-by:
Will Deacon <will.deacon@arm.com>
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