add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/x86/kernel/step.c
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@@ -175,8 +175,7 @@
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 	 *
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 	 * NOTE: this means that set/clear TIF_BLOCKSTEP is only safe if
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 	 * task is current or it can't be running, otherwise we can race
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-	 * with __switch_to_xtra(). We rely on ptrace_freeze_traced() but
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-	 * PTRACE_KILL is not safe.
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+	 * with __switch_to_xtra(). We rely on ptrace_freeze_traced().
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 	 */
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 	local_irq_disable();
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 	debugctl = get_debugctlmsr();