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Re: [RFC][ PATCH -tip v2 3/7] Kbuild: disable gcc crossjumping
- From: Masami Hiramatsu <mhiramat at redhat dot com>
- To: Steven Rostedt <rostedt at goodmis dot org>, Ingo Molnar <mingo at elte dot hu>, Ananth N Mavinakayanahalli <ananth at in dot ibm dot com>, lkml <linux-kernel at vger dot kernel dot org>, systemtap <systemtap at sources dot redhat dot com>, DLE <dle-develop at lists dot sourceforge dot net>, Jim Keniston <jkenisto at us dot ibm dot com>, Srikar Dronamraju <srikar at linux dot vnet dot ibm dot com>, Christoph Hellwig <hch at infradead dot org>, Frederic Weisbecker <fweisbec at gmail dot com>, "H. Peter Anvin" <hpa at zytor dot com>, Anders Kaseorg <andersk at ksplice dot com>, Tim Abbott <tabbott at ksplice dot com>
- Date: Fri, 17 Jul 2009 17:15:23 -0400
- Subject: Re: [RFC][ PATCH -tip v2 3/7] Kbuild: disable gcc crossjumping
- References: <20090622212255.5384.53732.stgit@localhost.localdomain> <20090622212313.5384.84166.stgit@localhost.localdomain> <alpine.DEB.2.00.0906271611280.12592@gandalf.stny.rr.com> <20090717202825.GA6872@merkur.ravnborg.org> <4A60E972.1060301@redhat.com>
Masami Hiramatsu wrote:
> Sam Ravnborg wrote:
>> On Sat, Jun 27, 2009 at 04:13:04PM -0400, Steven Rostedt wrote:
>>> A change like this requires an ACK from Sam Ravnborg.
>>>
>>> -- Steve
>> Overdue review...
>>
>> I do not know the gcc option so I cannot comment on theeffect of it.
>
> Thanks for comment. however, as far as I can see, I couldn't find
any inter-function jumps populated by crossjump optimization
> in the difference between binary with -fno-crossjump and without it.
> So I decided to drop this patch...
--
Masami Hiramatsu
Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division
e-mail: mhiramat@redhat.com