Re: [PATCH 2/2] ptrace: fix set_task_blockstep()->update_debugctlmsr()logic

[Sebastian Andrzej Siewior]

On 08/07/2012 11:41 AM, Sebastian Andrzej Siewior wrote:
> On 08/03/2012 06:29 PM, Oleg Nesterov wrote:
> For uprobes we never set the bit, we only need it cleared. We get here
> via int 3 and do_debug() already clears TIF_BLOCKSTEP because the
> CPU clears the bit in CPU. So both, TIF_BLOCKSTEP and DEBUGCTLMSR_BTF
> are never set.

Actually I'm, wrong. Syscalls do clear the DEBUGCTLMSR_BTF bit, int3
does not. So yes, we need it after all…

Sebastian
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