linux-kernel - Re: [PATCH] local_t : powerpc extension

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Date:	Thu, 15 Feb 2007 15:02:45 -0500
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Kumar Gala <galak@...nel.crashing.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] local_t : powerpc extension - use long for powerpc32

* Kumar Gala (galak@...nel.crashing.org) wrote:
> is there a reason this isn't local_add_return(long a, local_t *l) on  
> ppc32?
> 
> (same comment for other functions)
> 
> - k

no, except that we use the code is taken from atomic.h and used an
int parameter. However, due to the semantics of local_t, we should
manipulate longs instead of ints, even if they are the same size on a
given architecture (ppc32 and mips32 are affectec by this).

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>

--- a/include/asm-powerpc/local.h
+++ b/include/asm-powerpc/local.h
@@ -21,9 +21,9 @@ typedef struct
 
 #ifndef __powerpc64__
 
-static __inline__ int local_add_return(int a, local_t *l)
+static __inline__ long local_add_return(long a, local_t *l)
 {
-	int t;
+	long t;
 
 	__asm__ __volatile__(
 "1:	lwarx	%0,0,%2		# local_add_return\n\
@@ -40,9 +40,9 @@ static __inline__ int local_add_return(int a, local_t *l)
 
 #define local_add_negative(a, l)	(local_add_return((a), (l)) < 0)
 
-static __inline__ int local_sub_return(int a, local_t *l)
+static __inline__ long local_sub_return(long a, local_t *l)
 {
-	int t;
+	long t;
 
 	__asm__ __volatile__(
 "1:	lwarx	%0,0,%2		# local_sub_return\n\
@@ -57,9 +57,9 @@ static __inline__ int local_sub_return(int a, local_t *l)
 	return t;
 }
 
-static __inline__ int local_inc_return(local_t *l)
+static __inline__ long local_inc_return(local_t *l)
 {
-	int t;
+	long t;
 
 	__asm__ __volatile__(
 "1:	lwarx	%0,0,%1		# local_inc_return\n\
@@ -84,9 +84,9 @@ static __inline__ int local_inc_return(local_t *l)
  */
 #define local_inc_and_test(l) (local_inc_return(l) == 0)
 
-static __inline__ int local_dec_return(local_t *l)
+static __inline__ long local_dec_return(local_t *l)
 {
-	int t;
+	long t;
 
 	__asm__ __volatile__(
 "1:	lwarx	%0,0,%1		# local_dec_return\n\
@@ -114,9 +114,9 @@ static __inline__ int local_dec_return(local_t *l)
  * Atomically adds @a to @l, so long as it was not @u.
  * Returns non-zero if @l was not @u, and zero otherwise.
  */
-static __inline__ int local_add_unless(local_t *l, int a, int u)
+static __inline__ int local_add_unless(local_t *l, long a, long u)
 {
-	int t;
+	long t;
 
 	__asm__ __volatile__ (
 "1:	lwarx	%0,0,%1		# local_add_unless\n\
@@ -144,9 +144,9 @@ static __inline__ int local_add_unless(local_t *l, int a, int u)
  * Atomically test *l and decrement if it is greater than 0.
  * The function returns the old value of *l minus 1.
  */
-static __inline__ int local_dec_if_positive(local_t *l)
+static __inline__ long local_dec_if_positive(local_t *l)
 {
-	int t;
+	long t;
 
 	__asm__ __volatile__(
 "1:	lwarx	%0,0,%1		# local_dec_if_positive\n\
-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Candidate, École Polytechnique de Montréal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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