linux-kernel - Re: [RFC Patch 6/9] Use virtual debug registers in process/thread handling code

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Date:	Wed, 15 Oct 2008 18:44:07 -0700 (PDT)
From:	Roland McGrath <roland@...hat.com>
To:	prasad@...ux.vnet.ibm.com
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Alan Stern <stern@...land.harvard.edu>,
	akpm@...ux-foundation.org, mingo@...e.hu,
	jason.wessel@...driver.com, avi@...ranet.com,
	richardj_moore@...ibm.com
Subject: Re: [RFC Patch 6/9] Use virtual debug registers in process/thread
	handling code

+/*
+	 * Handle debug registers.  This must be done _after_ current
+	 * is updated.
+	 */
+	if (unlikely(test_tsk_thread_flag(next_p, TIF_DEBUG)))
+		switch_to_thread_hw_breakpoint(next_p);

It would be good if we could arrange that this works before current changes.
That way it says in __switch_to_xtra, which is off the hot path.

If you are moving it, then you need to match that by removing _TIF_DEBUG
from _TIF_WORK_CTXSW_NEXT.


Thanks,
Roland
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