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: <00000141b90841a8-3fb61f1e-89aa-4a35-94d4-a264ac91462b-000000@email.amazonses.com>
Date:	Mon, 14 Oct 2013 22:13:48 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
cc:	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

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.

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