Re: [PATCH] x86, syscall: Fix _TIF_NOHZ handling in syscall_trace_enter_phase1
From: Thomas Gleixner
Date: Wed Nov 19 2014 - 17:14:22 EST
On Wed, 19 Nov 2014, Andy Lutomirski wrote:
> TIF_NOHZ is 19 (i.e. _TIF_SYSCALL_TRACE | _TIF_NOTIFY_RESUME |
> _TIF_SINGLESTEP), not (1<<19).
> This code is involved in Dave's trinity lockup, but I don't see why
> it would cause any of the problems he's seeing, except inadvertently
> by causing a different path through entry_64.S's syscall handling.
Right, while it is wrong it does not explain the wreckage on 3.17,
which does not have that code.
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