linux-kernel - Re: [PATCH 34/34] mm: dynamically allocate page->ptl if it cannot be embedded to struct page

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Message-Id: <20131014222653.86EE1E0090@blue.fi.intel.com>
Date:	Tue, 15 Oct 2013 01:26:53 +0300 (EEST)
From:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH 34/34] mm: dynamically allocate page->ptl if it cannot be
 embedded to struct page

Christoph Lameter wrote:
> On Tue, 15 Oct 2013, Kirill A. Shutemov wrote:
> 
> > Feel free to propose a patch. I don't see much point.
> 
> Right now you are using a long to stand in for a spinlock_t or a pointer
> to a spinlock_t. An #ifdef would allow to define the proper type and
> therefore the compiler to check that the ptl is correctly used.

You should not use it directly anyway: page->ptl is not there at all if
USE_SPLIT_PTE_PTLOCKS is 0. Compiler checks limited to few helpers and use
a kbuild hack is overkill to me.

-- 
 Kirill A. Shutemov
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