Messages in this thread Patch in this message | | | Date | Thu, 24 May 2018 16:36:30 +0200 | From | Sebastian Andrzej Siewior <> | Subject | [PATCH] signal: Revert ptrace preempt magic |
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From: Thomas Gleixner <tglx@linutronix.de>
Upstream commit '53da1d9456fe7f8 fix ptrace slowness' is nothing more than a bandaid around the ptrace design trainwreck. It's not a correctness issue, it's merily a cosmetic bandaid.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> --- kernel/signal.c | 8 -------- 1 file changed, 8 deletions(-)
--- a/kernel/signal.c +++ b/kernel/signal.c @@ -1876,15 +1876,7 @@ static void ptrace_stop(int exit_code, i if (gstop_done && ptrace_reparented(current)) do_notify_parent_cldstop(current, false, why); - /* - * Don't want to allow preemption here, because - * sys_ptrace() needs this task to be inactive. - * - * XXX: implement read_unlock_no_resched(). - */ - preempt_disable(); read_unlock(&tasklist_lock); - preempt_enable_no_resched(); freezable_schedule(); } else { /*
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