linux-kernel - Re: [PATCH 1/9] mm: rename SPLIT_PTLOCKS to SPLIT_PTE

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Message-ID: <52332D32.8070302@intel.com>
Date:	Fri, 13 Sep 2013 08:20:18 -0700
From:	Dave Hansen <dave.hansen@...el.com>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
CC:	Alex Thorlton <athorlton@....com>, Ingo Molnar <mingo@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	"Eric W . Biederman" <ebiederm@...ssion.com>,
	"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Andi Kleen <ak@...ux.intel.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Dave Jones <davej@...hat.com>,
	David Howells <dhowells@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Kees Cook <keescook@...omium.org>,
	Mel Gorman <mgorman@...e.de>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	Robin Holt <robinmholt@...il.com>,
	Sedat Dilek <sedat.dilek@...il.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 1/9] mm: rename SPLIT_PTLOCKS to SPLIT_PTE_PTLOCKS

On 09/13/2013 06:06 AM, Kirill A. Shutemov wrote:
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -207,7 +207,7 @@ config PAGEFLAGS_EXTENDED
>  # PA-RISC 7xxx's spinlock_t would enlarge struct page from 32 to 44 bytes.
>  # DEBUG_SPINLOCK and DEBUG_LOCK_ALLOC spinlock_t also enlarge struct page.
>  #
> -config SPLIT_PTLOCK_CPUS
> +config SPLIT_PTE_PTLOCK_CPUS
>  	int
>  	default "999999" if ARM && !CPU_CACHE_VIPT
>  	default "999999" if PARISC && !PA20

If someone has a config where this is set to some non-default value,
won't changing the name cause this to revert back to the defaults?

I don't know how big of a deal it is to other folks, but you can always
do this:

config SPLIT_PTE_PTLOCK_CPUS
  	int
	default SPLIT_PTLOCK_CPUS if SPLIT_PTLOCK_CPUS

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