From: Jianyu Zhan <nasa4836@gmail.com>
Date: Tue, 21 Jan 2014 23:49:12 +0000 (-0800)
Subject: mm/vmalloc: interchage the implementation of vmalloc_to_{pfn,page}
X-Git-Tag: v3.14-rc1~134^2~71
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ece86e222db48d04bda218a2be70e384518bb08c;p=pandora-kernel.git

mm/vmalloc: interchage the implementation of vmalloc_to_{pfn,page}

Currently we are implementing vmalloc_to_pfn() as a wrapper around
vmalloc_to_page(), which is implemented as follow:

 1. walks the page talbes to generates the corresponding pfn,
 2. then converts the pfn to struct page,
 3. returns it.

And vmalloc_to_pfn() re-wraps vmalloc_to_page() to get the pfn.

This seems too circuitous, so this patch reverses the way: implement
vmalloc_to_page() as a wrapper around vmalloc_to_pfn().  This makes
vmalloc_to_pfn() and vmalloc_to_page() slightly more efficient.

No functional change.

Signed-off-by: Jianyu Zhan <nasa4836@gmail.com>
Cc: Vladimir Murzin <murzin.v@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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