2018-08-27 14:32:32 +00:00
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Subject: signal: Revert ptrace preempt magic
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From: Thomas Gleixner <tglx@linutronix.de>
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Date: Wed, 21 Sep 2011 19:57:12 +0200
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2019-02-27 18:51:46 +00:00
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Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.25-rt16.tar.xz
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2018-08-27 14:32:32 +00:00
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Upstream commit '53da1d9456fe7f8 fix ptrace slowness' is nothing more
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than a bandaid around the ptrace design trainwreck. It's not a
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correctness issue, it's merily a cosmetic bandaid.
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Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
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---
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kernel/signal.c | 8 --------
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1 file changed, 8 deletions(-)
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--- a/kernel/signal.c
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+++ b/kernel/signal.c
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2019-02-27 18:51:46 +00:00
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@@ -2094,15 +2094,7 @@ static void ptrace_stop(int exit_code, i
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2018-08-27 14:32:32 +00:00
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if (gstop_done && ptrace_reparented(current))
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do_notify_parent_cldstop(current, false, why);
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- /*
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- * Don't want to allow preemption here, because
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- * sys_ptrace() needs this task to be inactive.
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- *
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- * XXX: implement read_unlock_no_resched().
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- */
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- preempt_disable();
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read_unlock(&tasklist_lock);
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- preempt_enable_no_resched();
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freezable_schedule();
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} else {
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/*
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