Fix FRV cmpxchg_local

Fix the FRV cmpxchg_local by breaking the following header dependency loop :

linux/kernel.h -> linux/bitops.h -> asm-frv/bitops.h -> asm-frv/atomic.h
  -> asm-frv/system.h ->
  asm-generic/cmpxchg_local.h -> typecheck() defined in linux/kernel.h

and

linux/kernel.h -> linux/bitops.h -> asm-frv/bitops.h -> asm-frv/atomic.h ->
  asm-generic/cmpxchg_local.h -> typecheck() defined in linux/kernel.h

In order to fix this :
- Move the atomic_test_and_ *_mask inlines from asm-frv/atomic.h (why are they
  there at all anyway ? They are not touching atomic_t variables!) to
  asm-frv/bitops.h.

Also fix a build issue with cmpxchg : it does not cast to (unsigned long *)
like other architectures, to deal with it in the cmpxchg_local macro.

FRV builds fine with this patch.

Thanks to Adrian Bunk <bunk@kernel.org> for spotting this bug.

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: Adrian Bunk <bunk@kernel.org>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 81 insertions, 2 deletions

diff --git a/include/asm-frv/bitops.h b/include/asm-frv/bitops.h
index 5f86b876b29..39456ba0ec1 100644
--- a/include/asm-frv/bitops.h
+++ b/include/asm-frv/bitops.h
@@ -16,8 +16,6 @@
 
 #include <linux/compiler.h>
 #include <asm/byteorder.h>
-#include <asm/system.h>
-#include <asm/atomic.h>
 
 #ifdef __KERNEL__
 
@@ -33,6 +31,87 @@
 #define smp_mb__before_clear_bit()	barrier()
 #define smp_mb__after_clear_bit()	barrier()
 
+#ifndef CONFIG_FRV_OUTOFLINE_ATOMIC_OPS
+static inline
+unsigned long atomic_test_and_ANDNOT_mask(unsigned long mask, volatile unsigned long *v)
+{
+	unsigned long old, tmp;
+
+	asm volatile(
+		"0:						\n"
+		"	orcc		gr0,gr0,gr0,icc3	\n"	/* set ICC3.Z */
+		"	ckeq		icc3,cc7		\n"
+		"	ld.p		%M0,%1			\n"	/* LD.P/ORCR are atomic */
+		"	orcr		cc7,cc7,cc3		\n"	/* set CC3 to true */
+		"	and%I3		%1,%3,%2		\n"
+		"	cst.p		%2,%M0		,cc3,#1	\n"	/* if store happens... */
+		"	corcc		gr29,gr29,gr0	,cc3,#1	\n"	/* ... clear ICC3.Z */
+		"	beq		icc3,#0,0b		\n"
+		: "+U"(*v), "=&r"(old), "=r"(tmp)
+		: "NPr"(~mask)
+		: "memory", "cc7", "cc3", "icc3"
+		);
+
+	return old;
+}
+
+static inline
+unsigned long atomic_test_and_OR_mask(unsigned long mask, volatile unsigned long *v)
+{
+	unsigned long old, tmp;
+
+	asm volatile(
+		"0:						\n"
+		"	orcc		gr0,gr0,gr0,icc3	\n"	/* set ICC3.Z */
+		"	ckeq		icc3,cc7		\n"
+		"	ld.p		%M0,%1			\n"	/* LD.P/ORCR are atomic */
+		"	orcr		cc7,cc7,cc3		\n"	/* set CC3 to true */
+		"	or%I3		%1,%3,%2		\n"
+		"	cst.p		%2,%M0		,cc3,#1	\n"	/* if store happens... */
+		"	corcc		gr29,gr29,gr0	,cc3,#1	\n"	/* ... clear ICC3.Z */
+		"	beq		icc3,#0,0b		\n"
+		: "+U"(*v), "=&r"(old), "=r"(tmp)
+		: "NPr"(mask)
+		: "memory", "cc7", "cc3", "icc3"
+		);
+
+	return old;
+}
+
+static inline
+unsigned long atomic_test_and_XOR_mask(unsigned long mask, volatile unsigned long *v)
+{
+	unsigned long old, tmp;
+
+	asm volatile(
+		"0:						\n"
+		"	orcc		gr0,gr0,gr0,icc3	\n"	/* set ICC3.Z */
+		"	ckeq		icc3,cc7		\n"
+		"	ld.p		%M0,%1			\n"	/* LD.P/ORCR are atomic */
+		"	orcr		cc7,cc7,cc3		\n"	/* set CC3 to true */
+		"	xor%I3		%1,%3,%2		\n"
+		"	cst.p		%2,%M0		,cc3,#1	\n"	/* if store happens... */
+		"	corcc		gr29,gr29,gr0	,cc3,#1	\n"	/* ... clear ICC3.Z */
+		"	beq		icc3,#0,0b		\n"
+		: "+U"(*v), "=&r"(old), "=r"(tmp)
+		: "NPr"(mask)
+		: "memory", "cc7", "cc3", "icc3"
+		);
+
+	return old;
+}
+
+#else
+
+extern unsigned long atomic_test_and_ANDNOT_mask(unsigned long mask, volatile unsigned long *v);
+extern unsigned long atomic_test_and_OR_mask(unsigned long mask, volatile unsigned long *v);
+extern unsigned long atomic_test_and_XOR_mask(unsigned long mask, volatile unsigned long *v);
+
+#endif
+
+#define atomic_clear_mask(mask, v)	atomic_test_and_ANDNOT_mask((mask), (v))
+#define atomic_set_mask(mask, v)	atomic_test_and_OR_mask((mask), (v))
+
 static inline int test_and_clear_bit(int nr, volatile void *addr)
 {
 	volatile unsigned long *ptr = addr;