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From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
        Alex Thorlton <athorlton@sgi.com>, Ingo Molnar <mingo@redhat.com>,
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References: <1379330740-5602-1-git-send-email-kirill.shutemov@linux.intel.com>
 <20130916114404.GC9326@twins.programming.kicks-ass.net>
Subject: Re: [PATCHv2 0/9] split page table lock for PMD tables
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Date: Mon, 16 Sep 2013 15:11:54 +0300 (EEST)
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Peter Zijlstra wrote:
> >   - reuse CONFIG_SPLIT_PTLOCK_CPUS for PMD split lock;
> 
> So why is there still CONFIG_SPLIT_PTE_PTLOCK and
> CONFIG_SPLIT_PMD_PTLOCK in the series?

There is not.

We have USE_SPLIT_{PTE,PMD}_PTLOCK. We can't use split pmd lock everywhere
split pte lock is available: it requires separate enabling on arch side
and will not work on all hardware (i.e. with 2-level page table
configuration).

-- 
 Kirill A. Shutemov
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