linux-kernel - Re: [patch 05/24] perfmon: X86 generic code (x86)

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Date:	Wed, 26 Nov 2008 14:32:13 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
cc:	Andi Kleen <andi@...stfloor.org>, eranian@...glemail.com,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	mingo@...e.hu, x86@...nel.org, eranian@...il.com
Subject: Re: [patch 05/24] perfmon: X86 generic code (x86)

On Wed, 26 Nov 2008, Stephen Rothwell wrote:
> Hi Andi,
> 
> On Wed, 26 Nov 2008 12:33:09 +0100 Andi Kleen <andi@...stfloor.org> wrote:
> >
> > > + * x86 does not need extra alignment requirements for the sampling buffer
> > > + */
> > > +#define PFM_ARCH_SMPL_ALIGN_SIZE	0
> > > +
> > > +asmlinkage void  pmu_interrupt(void);
> > > +
> > > +static inline void pfm_arch_bv_copy(u64 *a, u64 *b, int nbits)
> > 
> > All these bitmap wrappers just seem like unnecessary obfuscation.
> > Could you just drop them and call the standard functions directly?
> 
> These were added after comments from the PowerPC maintainer since how the
> bitmaps are accessed needs to be arch specific.

Just because perfmon uses u64 for bitfields instead of unsigned
long, therefor it breaks on BE32 machines.

I have not yet found a good reason why it needs to use u64 instead of
using what's there already.

Thanks,

	tglx
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