linux-kernel - Re: [PATCH 11/20] arch,m68k: Fold atomic

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Fri, 9 May 2014 11:16:46 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Linux-Arch <linux-arch@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Will Deacon <will.deacon@....com>,
	Paul McKenney <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH 11/20] arch,m68k: Fold atomic_ops

On Fri, May 09, 2014 at 11:08:37AM +0200, Geert Uytterhoeven wrote:
> These two chunks are identical, so please move them out of the #ifdef.

More lines saved!

---
Subject: arch,m68k: Fold atomic_ops
From: Peter Zijlstra <peterz@...radead.org>
Date: Sun Mar 23 19:06:34 CET 2014

Many of the atomic op implementations are the same except for one
instruction; fold the lot into a few CPP macros and reduce LoC.

This also prepares for easy addition of new ops.

Requires asm_op due to eor.

Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
---
 arch/m68k/include/asm/atomic.h |  113 +++++++++++++++++------------------------
 1 file changed, 49 insertions(+), 64 deletions(-)

--- a/arch/m68k/include/asm/atomic.h
+++ b/arch/m68k/include/asm/atomic.h
@@ -30,15 +30,56 @@
 #define	ASM_DI	"di"
 #endif
 
-static inline void atomic_add(int i, atomic_t *v)
-{
-	__asm__ __volatile__("addl %1,%0" : "+m" (*v) : ASM_DI (i));
-}
+#define ATOMIC_OP(op, c_op, asm_op)					\
+static inline void atomic_##op(int i, atomic_t *v)			\
+{									\
+	__asm__ __volatile__(#asm_op "l %1,%0" : "+m" (*v) : ASM_DI (i));\
+}									\
 
-static inline void atomic_sub(int i, atomic_t *v)
-{
-	__asm__ __volatile__("subl %1,%0" : "+m" (*v) : ASM_DI (i));
-}
+#ifdef CONFIG_RMW_INSNS
+
+#define ATOMIC_OP_RETURN(op, c_op, asm_op)				\
+static inline int atomic_##op##_return(int i, atomic_t *v)		\
+{									\
+	int t, tmp;							\
+									\
+	__asm__ __volatile__(						\
+			"1:	movel %2,%1\n"				\
+			"	" #asm_op "l %3,%1\n"			\
+			"	casl %2,%1,%0\n"			\
+			"	jne 1b"					\
+			: "+m" (*v), "=&d" (t), "=&d" (tmp)		\
+			: "g" (i), "2" (atomic_read(v)));		\
+	return t;							\
+}
+
+#else
+
+#define ATOMIC_OP_RETURN(op, c_op, asm_op)				\
+static inline int atomic_##op##_return(int i, atomic_t * v)		\
+{									\
+	unsigned long flags;						\
+	int t;								\
+									\
+	local_irq_save(flags);						\
+	t = (v->counter c_op i);					\
+	local_irq_restore(flags);					\
+									\
+	return t;							\
+}
+
+#endif /* CONFIG_RMW_INSNS */
+
+#define ATOMIC_OPS(op, c_op, asm_op)					\
+	ATOMIC_OP(op, c_op, asm_op)					\
+	ATOMIC_OP_RETURN(op, c_op, asm_op)
+
+ATOMIC_OPS(add, +=, add)
+ATOMIC_OPS(sub, -=, sub)
+
+#undef ATOMIC_OPS
+#undef ATOMIC_OP_RETURN
+#undef ATOMIC_OP
 
 static inline void atomic_inc(atomic_t *v)
 {
@@ -76,67 +117,11 @@ static inline int atomic_inc_and_test(at
 
 #ifdef CONFIG_RMW_INSNS
 
-static inline int atomic_add_return(int i, atomic_t *v)
-{
-	int t, tmp;
-
-	__asm__ __volatile__(
-			"1:	movel %2,%1\n"
-			"	addl %3,%1\n"
-			"	casl %2,%1,%0\n"
-			"	jne 1b"
-			: "+m" (*v), "=&d" (t), "=&d" (tmp)
-			: "g" (i), "2" (atomic_read(v)));
-	return t;
-}
-
-static inline int atomic_sub_return(int i, atomic_t *v)
-{
-	int t, tmp;
-
-	__asm__ __volatile__(
-			"1:	movel %2,%1\n"
-			"	subl %3,%1\n"
-			"	casl %2,%1,%0\n"
-			"	jne 1b"
-			: "+m" (*v), "=&d" (t), "=&d" (tmp)
-			: "g" (i), "2" (atomic_read(v)));
-	return t;
-}
-
 #define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
 #define atomic_xchg(v, new) (xchg(&((v)->counter), new))
 
 #else /* !CONFIG_RMW_INSNS */
 
-static inline int atomic_add_return(int i, atomic_t * v)
-{
-	unsigned long flags;
-	int t;
-
-	local_irq_save(flags);
-	t = atomic_read(v);
-	t += i;
-	atomic_set(v, t);
-	local_irq_restore(flags);
-
-	return t;
-}
-
-static inline int atomic_sub_return(int i, atomic_t * v)
-{
-	unsigned long flags;
-	int t;
-
-	local_irq_save(flags);
-	t = atomic_read(v);
-	t -= i;
-	atomic_set(v, t);
-	local_irq_restore(flags);
-
-	return t;
-}
-
 static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
 {
 	unsigned long flags;

Content of type "application/pgp-signature" skipped