linux-kernel - Re: [patch] HWBKPT: Make bp_len type to u64 generic across the arch

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Message-ID: <20100201174459.GA5241@nowhere>
Date:	Mon, 1 Feb 2010 18:45:03 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Mahesh Salgaonkar <mahesh@...ux.vnet.in.ibm.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	"K. Prasad" <prasad@...ux.vnet.ibm.com>,
	Maneesh Soni <maneesh@...ibm.com>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Martin <schwidefsky@...ibm.com>,
	Mahesh Salgaonkar <mahesh@...ux.vnet.ibm.com>
Subject: Re: [patch] HWBKPT: Make bp_len type to u64 generic across the arch

On Mon, Feb 01, 2010 at 09:23:04AM +0100, Peter Zijlstra wrote:
> On Sat, 2010-01-30 at 19:38 +0100, Frederic Weisbecker wrote:
> > > diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
> > > index 1438463..30c78bd 100644
> > > --- a/include/linux/perf_event.h
> > > +++ b/include/linux/perf_event.h
> > > @@ -211,11 +211,9 @@ struct perf_event_attr {
> > >               __u32           wakeup_watermark; /* bytes before wakeup   */
> > >       };
> > >  
> > > -     __u32                   __reserved_2;
> > > -
> > > -     __u64                   bp_addr;
> > >       __u32                   bp_type;
> > > -     __u32                   bp_len;
> > > +     __u64                   bp_addr;
> > > +     __u64                   bp_len;
> > >  };
> > 
> > 
> > 
> > Peter, what do you think about this new layout?
> > Putting the bp_type right after the wakeup_* fields
> > is going to remove the padding difference between
> > 64 and 32 archs. That looks better than the __reserved_2
> > we had.
> 
> Right, I think this works nicely in that all elements will be naturally
> aligned and not result in different layouts between 32/64 bit builds.
> 
> > If this patch can make it for .33, it would be nice.
> 
> It has to make .33, if it doesn't you're hosed because then the old
> layout is fixed in stone.
> 


Truly.
I'll send a pull request to Ingo quickly then.

Thanks.

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