From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Mon, 3 Aug 2009 05:08:48 +0000 (+0900)
Subject: x86, percpu: Add 'percpu_read_stable()' interface for cacheable accesses
X-Git-Tag: v2.6.32-rc1~706^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ed8d9adf357ec331603fa1049510399812cea7e5;p=pandora-kernel.git

x86, percpu: Add 'percpu_read_stable()' interface for cacheable accesses

This is very useful for some common things like 'get_current()' and
'get_thread_info()', which can be used multiple times in a function, and
where the result is cacheable.

tj: Added the magical undocumented "P" modifier to UP __percpu_arg()
    to force gcc to dereference the pointer value passed in via the
    "p" input constraint.  Without this, percpu_read_stable() returns
    the address of the percpu variable.  Also added comment explaining
    the difference between percpu_read() and percpu_read_stable().

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
---

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