linux-kernel - Re: [BUG REPORT] ktime_get

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Message-ID: <CAO6TR8WkGu6dHzmEs=J_azX6dN4qtStT-C6qehTtDjy+4adk1Q@mail.gmail.com>
Date:	Thu, 21 Jan 2016 02:08:50 -0700
From:	Jeff Merkey <linux.mdb@...il.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	John Stultz <john.stultz@...aro.org>
Subject: Re: [BUG REPORT] ktime_get_ts64 causes Hard Lockup

This bug has been fixed as of linux-next-20160121.  I just checked so
looks like its handled.

	delta = timekeeping_get_delta(tkr);

	nsec = (delta * tkr->mult + tkr->xtime_nsec) >> tkr->shift;
     251:	8b 15 00 00 00 00    	mov    0x0(%rip),%edx        # 257
<ktime_get_ts64+0x77>
     257:	49 0f 45 c4          	cmovne %r12,%rax
     25b:	48 0f af c2          	imul   %rdx,%rax
     25f:	48 03 05 00 00 00 00 	add    0x0(%rip),%rax        # 266
<ktime_get_ts64+0x86>
     266:	48 d3 e8             	shr    %cl,%rax    << correct
	

Jeff