From: "Chen, Kenneth W" <kenneth.w.chen@intel.com>
To: linux-ia64@vger.kernel.org
Subject: RE: [PATCH]IA64 trap code 16 bytes atomic copy on montecito, take 2
Date: Thu, 02 Nov 2006 19:50:08 +0000 [thread overview]
Message-ID: <000001c6feb8$19f14e40$ff0da8c0@amr.corp.intel.com> (raw)
In-Reply-To: <454961EE.4070608@intel.com>
Keshavamurthy, Anil wrote on Thursday, November 02, 2006 11:39 AM
> > > > Do you allow kprobe insertion on "L+X" instruction? It looks like so.
> > > > Then how do you maintain atomic update to L and X instruction right
> > > > now with memcpy?
>
> Instruction Type "L+X" take two instruction slots i.e slot 1 and slot 2,
> but we only modify slot 2 to insert or remove the break and slot 2 nicely
> happens to be in the upper 8 bytes of the instruction bundle. So we don't have any
> issues here. For either inserting or removing break for "L+X" we don;t modify Slot 1
> value at all.
I wasn't aware that X slot can be encoded with break.i. In that case, yes,
only slot 2 is modified and everything is fine. I guess the compatibility
mode saves the day for patching "L+X".
next prev parent reply other threads:[~2006-11-02 19:50 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-11-02 3:11 [PATCH]IA64 trap code 16 bytes atomic copy on montecito, take 2 bibo,mao
2006-11-02 3:39 ` Keith Owens
2006-11-02 5:04 ` [PATCH]IA64 trap code 16 bytes atomic copy on montecito, take bibo,mao
2006-11-02 6:51 ` bibo,mao
2006-11-02 7:17 ` [PATCH]IA64 trap code 16 bytes atomic copy on montecito, take 2 Keith Owens
2006-11-02 7:22 ` Keith Owens
2006-11-02 7:25 ` Keith Owens
2006-11-02 7:27 ` [PATCH]IA64 trap code 16 bytes atomic copy on montecito, take bibo,mao
2006-11-02 7:32 ` [PATCH]IA64 trap code 16 bytes atomic copy on montecito, take 2 Keith Owens
2006-11-02 7:38 ` Chen, Kenneth W
2006-11-02 7:45 ` Chen, Kenneth W
2006-11-02 7:52 ` [PATCH]IA64 trap code 16 bytes atomic copy on montecito, take bibo,mao
2006-11-02 8:17 ` [PATCH]IA64 trap code 16 bytes atomic copy on montecito, take 2 Chen, Kenneth W
2006-11-02 8:56 ` Chen, Kenneth W
2006-11-02 9:05 ` [PATCH]IA64 trap code 16 bytes atomic copy on montecito, take bibo,mao
2006-11-02 9:22 ` [PATCH]IA64 trap code 16 bytes atomic copy on montecito, take 2 Chen, Kenneth W
2006-11-02 19:50 ` Chen, Kenneth W [this message]
2006-11-02 19:57 ` Luck, Tony
2006-11-02 20:29 ` Chen, Kenneth W
2006-11-03 1:25 ` [PATCH]IA64 trap code 16 bytes atomic copy on montecito, take bibo,mao
2006-11-03 1:55 ` [PATCH]IA64 trap code 16 bytes atomic copy on montecito, take 2 Chen, Kenneth W
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