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From: Andi Kleen <ak@suse.de>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Ingo Molnar <mingo@elte.hu>,
	ying.huang@intel.com, tglx@linutronix.de,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH] [6/8] Account overlapped mappings in end_pfn_map
Date: Mon, 11 Feb 2008 15:24:05 +0100	[thread overview]
Message-ID: <200802111524.05852.ak@suse.de> (raw)
In-Reply-To: <1202739391.6247.13.camel@lappy>

On Monday 11 February 2008 15:16:31 Peter Zijlstra wrote:
> 
> On Mon, 2008-02-11 at 14:27 +0100, Andi Kleen wrote:
> 
> > Ok patch with hungarized variables appended.
> 
> > -static void __meminit
> > +static unsigned long __meminit
> >  phys_pmd_update(pud_t *pud, unsigned long address, unsigned long end)
> >  {
> > +	unsigned long true_end;
> >  	pmd_t *pmd = pmd_offset(pud, 0);
> >  	spin_lock(&init_mm.page_table_lock);
> > -	phys_pmd_init(pmd, address, end);
> > +	true_end = phys_pmd_init(pmd, address, end);
> >  	spin_unlock(&init_mm.page_table_lock);
> >  	__flush_tlb_all();
> > +	return true_end;
> >  }
> 
> Just for the record, Hungarian notation would have it like:
> 
>   ulTrueEnd

_pfn is variant of hungarian notation (just postfix instead of prefix); 
that is why I referred to it. 

Admittedly it was a little unfair pun with Ingo, but he really 
asked for it  in this case :-)


> http://en.wikipedia.org/wiki/Hungarian_notation
> 
> And the kernel doesn't do that, to wit (from Documentation/CodingStyle):
> 
>  Linus Torvalds (against systems Hungarian): Encoding the type of a
> function into the name (so-called Hungarian notation) is brain damaged -
> the compiler knows the types anyway and can check those, and it only
> confuses the programmer.

xxx_pfn is exactly that. 

BTW Coding style also recommends to use short variable names inside 
functions. Ingo asked me actually to violate that:

"
LOCAL variable names should be short, and to the point.  If you have
some random integer loop counter, it should probably be called "i".
Calling it "loop_counter" is non-productive, if there is no chance of it
being mis-understood.  Similarly, "tmp" can be just about any type of
variable that is used to hold a temporary value.
"

I used r for result in this case which is 100% conform to coding style.

-Andi (trying to exit this thread) 

  reply	other threads:[~2008-02-11 14:24 UTC|newest]

Thread overview: 37+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-02-11  9:34 [PATCH] [0/8] Various kernel mapping bug fixes Andi Kleen
2008-02-11  9:34 ` [PATCH] [1/8] CPA: Fix gbpages support in try_preserve_lage_page Andi Kleen
2008-02-11  9:45   ` Thomas Gleixner
2008-02-11 10:12     ` Ingo Molnar
2008-02-11 11:01       ` Andi Kleen
2008-02-11  9:34 ` [PATCH] [2/8] CPA: Flush the caches when setting pages not present Andi Kleen
2008-02-11 11:00   ` Ingo Molnar
2008-02-11 12:26     ` Andi Kleen
2008-02-11  9:34 ` [PATCH] [3/8] CPA: Test the correct mapping alias on x86-64 Andi Kleen
2008-02-11 11:49   ` Ingo Molnar
2008-02-11  9:34 ` [PATCH] [4/8] CPA: Fix set_memory_x for ioremap Andi Kleen
2008-02-11 12:27   ` Ingo Molnar
2008-02-11 12:45     ` Andi Kleen
2008-02-11  9:34 ` [PATCH] [5/8] Fix logic error in 64bit memory hotadd Andi Kleen
2008-02-11 12:46   ` Ingo Molnar
2008-02-11 13:05     ` Andi Kleen
2008-02-11 13:33       ` Ingo Molnar
2008-02-11 13:44         ` Andi Kleen
2008-02-12 10:35       ` Yasunori Goto
2008-02-12 11:20         ` Andi Kleen
2008-02-11  9:34 ` [PATCH] [6/8] Account overlapped mappings in end_pfn_map Andi Kleen
2008-02-11 13:08   ` Ingo Molnar
2008-02-11 13:27     ` Andi Kleen
2008-02-11 13:55       ` Ingo Molnar
2008-02-11 14:16       ` Peter Zijlstra
2008-02-11 14:24         ` Andi Kleen [this message]
2008-02-11 14:41           ` Sam Ravnborg
2008-02-11 15:12   ` Arjan van de Ven
2008-02-11  9:34 ` [PATCH] [7/8] Implement true end_pfn_mapped for 32bit Andi Kleen
2008-02-12 19:39   ` Thomas Gleixner
2008-02-12 19:49     ` Andi Kleen
2008-02-12 20:25       ` Thomas Gleixner
2008-02-11  9:34 ` [PATCH] [8/8] RFC: Fix some EFI problems Andi Kleen
2008-02-12 20:04   ` Thomas Gleixner
2008-02-12 20:23     ` Andi Kleen
2008-02-12 20:48       ` Thomas Gleixner
2008-02-13 11:05         ` Andi Kleen

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