linux-kernel - [guv 03/16] Coccinelle script for __get_cpu

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Date:	Fri, 23 Aug 2013 19:02:13 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	linux-kernel@...r.kernel.org
Subject: [guv 03/16] Coccinelle script for __get_cpu_var conversion

Much of the work was done by this coccinelle script.

Wont catch everything (since coccinelle aborts when it no longer can make
sense out of macros, sigh) but it covers a lot of ground.

Signed-off-by: Christoph Lameter <cl@...ux.com>

Index: linux/scripts/coccinelle/convert/__get_cpu_var.cocci
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ linux/scripts/coccinelle/convert/__get_cpu_var.cocci	2013-08-22 14:41:13.976518846 -0500
@@ -0,0 +1,70 @@
+// Convert all &__get_cpu_var to this_cpu_ptr
+//
+// _get_cpu_var is defined as:
+//
+// #define __get_cpu_var(var) (*this_cpu_ptr(&(var)))
+//
+//&__get_cpu_var() is therefore
+//
+//	this_cpu_ptr(&var);
+//
+// The use of this_cpu_ptr() instead of __get_cpu_var clarifies
+// that we are relocating a per cpu offset and that there are
+// no get/put semantics involved.
+//
+//
+// Convert all &__get_cpu_vars (and also related functions)
+// to this_cpu_ptr(). Multiple transformations are provided
+// to be able to beautify the source a bit.
+//
+// Christoph Lameter <cl@...ux.com> August 20, 2013
+//
+
+@A@ expression E; @@
+
+...
+-(&__get_cpu_var(E))
++this_cpu_ptr(&E)
+...
+
+@B@ expression E; @@
+
+...
+-(&__raw_get_cpu_var(E))
++__this_cpu_ptr(&E)
+...
+
+@C@ expression E; @@
+
+...
+-&__get_cpu_var(E)
++this_cpu_ptr(&E)
+...
+
+@D@ expression E; @@
+
+...
+-&__raw_get_cpu_var(E)
++__this_cpu_ptr(&E)
+...
+
+@A2@ expression E; @@
+
+-(&__get_cpu_var(E))
++this_cpu_ptr(&E)
+
+@B2@ expression E; @@
+
+-(&__raw_get_cpu_var(E))
++__this_cpu_ptr(&E)
+
+@C2@ expression E; @@
+
+-&__get_cpu_var(E)
++this_cpu_ptr(&E)
+
+@D2@ expression E; @@
+
+-&__raw_get_cpu_var(E)
++__this_cpu_ptr(&E)
+

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