From: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Date: Fri, 20 Dec 2013 11:35:58 +0000 (+0200)
Subject: mm: do not allocate page->ptl dynamically, if spinlock_t fits to long
X-Git-Tag: v3.13-rc5~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=597d795a2a78;p=pandora-kernel.git

mm: do not allocate page->ptl dynamically, if spinlock_t fits to long

In struct page we have enough space to fit long-size page->ptl there,
but we use dynamically-allocated page->ptl if size(spinlock_t) is larger
than sizeof(int).

It hurts 64-bit architectures with CONFIG_GENERIC_LOCKBREAK, where
sizeof(spinlock_t) == 8, but it easily fits into struct page.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Hugh Dickins <hughd@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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