Re: [PATCH 1/1] asm-generic: move cmpxchg*_local defs to cmpxchg.h

From: Jonas Bonn
Date: Tue Mar 12 2013 - 08:35:49 EST

Hi Arnd,

Can you comment on this patch? This is needed so that the generic asm/cmpxchg.h can be used standalone (i.e. without pulling in atomic.h). OpenRISC uses the generic asm/cmpxchg.h and things currently don't build without this since linux/llist.h now includes asm/cmpxchg.h standalone.


On 02/28/2013 06:54 AM, Jonas Bonn wrote:
asm/cmpxchg.h can be included on its own and needs to be self-consistent.
The definitions for the cmpxchg*_local macros, as such, need to be part
of this file.

This fixes a build issue on OpenRISC since the system.h smashing patch
96f951edb1f1bdbbc99b0cd458f9808bb83d58ae that introdued the direct inclusion
asm/cmpxchg.h into linux/llist.h.

CC: David Howells <dhowells@xxxxxxxxxx>
Signed-off-by: Jonas Bonn <jonas@xxxxxxxxxxxx>
include/asm-generic/atomic.h | 6 ------
include/asm-generic/cmpxchg.h | 10 ++++++++++
2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/include/asm-generic/atomic.h b/include/asm-generic/atomic.h
index 1ced641..33bd2de 100644
--- a/include/asm-generic/atomic.h
+++ b/include/asm-generic/atomic.h
@@ -136,12 +136,6 @@ static inline void atomic_dec(atomic_t *v)
#define atomic_xchg(ptr, v) (xchg(&(ptr)->counter, (v)))
#define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), (old), (new)))

-#define cmpxchg_local(ptr, o, n) \
- ((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), (unsigned long)(o),\
- (unsigned long)(n), sizeof(*(ptr))))
-#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
static inline int __atomic_add_unless(atomic_t *v, int a, int u)
int c, old;
diff --git a/include/asm-generic/cmpxchg.h b/include/asm-generic/cmpxchg.h
index 1488302..811fb1e 100644
--- a/include/asm-generic/cmpxchg.h
+++ b/include/asm-generic/cmpxchg.h
@@ -92,6 +92,16 @@ unsigned long __xchg(unsigned long x, volatile void *ptr, int size)
#include <asm-generic/cmpxchg-local.h>

+#ifndef cmpxchg_local
+#define cmpxchg_local(ptr, o, n) \
+ ((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr), (unsigned long)(o),\
+ (unsigned long)(n), sizeof(*(ptr))))
+#ifndef cmpxchg64_local
+#define cmpxchg64_local(ptr, o, n) __cmpxchg64_local_generic((ptr), (o), (n))
#define cmpxchg(ptr, o, n) cmpxchg_local((ptr), (o), (n))
#define cmpxchg64(ptr, o, n) cmpxchg64_local((ptr), (o), (n))

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