linux-kernel - [PATCH] MIPS: Fix compile error implicit declaration of function cpu_local

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Message-Id: <1268337816.29250.3.camel@localhost.localdomain>
Date:	Fri, 12 Mar 2010 01:33:36 +0530
From:	Philby John <pjohn@...sta.com>
To:	linux-kernel@...r.kernel.org
Cc:	Christoph Lameter <cl@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>,
	David Daney <ddaney@...iumnetworks.com>
Subject: [PATCH] MIPS: Fix compile error implicit declaration of function
 cpu_local_wrap

The commit 38b7827fc removed cpu_local_xx macros that lead to
a compile error: implicit declaration of function 'cpu_local_wrap',
when compiled for the MIPS Cavium Octeon processors. Revert back
to old code.

CC: Christoph Lameter <cl@...ux-foundation.org>
CC: Tejun Heo <tj@...nel.org>
CC: David Daney <ddaney@...iumnetworks.com>
Signed-off-by: Philby John <pjohn@...sta.com>
---
 arch/mips/include/asm/local.h |   25 +++++++++++++++++++++++++
 1 files changed, 25 insertions(+), 0 deletions(-)

diff --git a/arch/mips/include/asm/local.h b/arch/mips/include/asm/local.h
index bdcdef0..65ec69d 100644
--- a/arch/mips/include/asm/local.h
+++ b/arch/mips/include/asm/local.h
@@ -193,4 +193,29 @@ static __inline__ long local_sub_return(long i, local_t * l)
 #define __local_add(i, l)	((l)->a.counter+=(i))
 #define __local_sub(i, l)	((l)->a.counter-=(i))
 
+/* Need to disable preemption for the cpu local counters otherwise we could
+   still access a variable of a previous CPU in a non atomic way. */
+#define cpu_local_wrap_v(l)             \
+	({ local_t res__;               \
+	   preempt_disable();           \
+	   res__ = (l);                 \
+	   preempt_enable();            \
+	   res__; })
+#define cpu_local_wrap(l)               \
+	({ preempt_disable();           \
+	   l;                           \
+	   preempt_enable(); })         \
+
+#define cpu_local_read(l)    cpu_local_wrap_v(local_read(&__get_cpu_var(l)))
+#define cpu_local_set(l, i)  cpu_local_wrap(local_set(&__get_cpu_var(l), (i)))
+#define cpu_local_inc(l)     cpu_local_wrap(local_inc(&__get_cpu_var(l)))
+#define cpu_local_dec(l)     cpu_local_wrap(local_dec(&__get_cpu_var(l)))
+#define cpu_local_add(i, l)  cpu_local_wrap(local_add((i), &__get_cpu_var(l)))
+#define cpu_local_sub(i, l)  cpu_local_wrap(local_sub((i), &__get_cpu_var(l)))
+
+#define __cpu_local_inc(l)      cpu_local_inc(l)
+#define __cpu_local_dec(l)      cpu_local_dec(l)
+#define __cpu_local_add(i, l)   cpu_local_add((i), (l))
+#define __cpu_local_sub(i, l)   cpu_local_sub((i), (l))
+
 #endif /* _ARCH_MIPS_LOCAL_H */
-- 
1.6.3.3.311.g7ec7



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