[PATCH] parisc: Convert to BIT_MASK() and BIT_WORD()

[PATCH] parisc: Convert to BIT_MASK() and BIT_WORD()

[Helge Deller]

Drop own open-coded implementation to set bits and use the kernel
provided BIT_MASK() and BIT_WORD() macros.

Signed-off-by: Helge Deller <deller@gmx.de>

diff --git a/arch/parisc/include/asm/bitops.h b/arch/parisc/include/asm/bitops.h
index a09eaebfdfd0..aa4e883431c1 100644
--- a/arch/parisc/include/asm/bitops.h
+++ b/arch/parisc/include/asm/bitops.h
@@ -12,21 +12,6 @@
 #include <asm/barrier.h>
 #include <linux/atomic.h>

-/*
- * HP-PARISC specific bit operations
- * for a detailed description of the functions please refer
- * to include/asm-i386/bitops.h or kerneldoc
- */
-
-#if __BITS_PER_LONG == 64
-#define SHIFT_PER_LONG 6
-#else
-#define SHIFT_PER_LONG 5
-#endif
-
-#define CHOP_SHIFTCOUNT(x) (((unsigned long) (x)) & (BITS_PER_LONG - 1))
-
-
 /* See http://marc.theaimsgroup.com/?t=108826637900003 for discussion
  * on use of volatile and __*_bit() (set/clear/change):
  *	*_bit() want use of volatile.
@@ -35,10 +20,10 @@

 static __inline__ void set_bit(int nr, volatile unsigned long * addr)
 {
-	unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr);
+	unsigned long mask = BIT_MASK(nr);
 	unsigned long flags;

-	addr += (nr >> SHIFT_PER_LONG);
+	addr += BIT_WORD(nr);
 	_atomic_spin_lock_irqsave(addr, flags);
 	*addr |= mask;
 	_atomic_spin_unlock_irqrestore(addr, flags);
@@ -46,21 +31,21 @@ static __inline__ void set_bit(int nr, volatile unsigned long * addr)

 static __inline__ void clear_bit(int nr, volatile unsigned long * addr)
 {
-	unsigned long mask = ~(1UL << CHOP_SHIFTCOUNT(nr));
+	unsigned long mask = BIT_MASK(nr);
 	unsigned long flags;

-	addr += (nr >> SHIFT_PER_LONG);
+	addr += BIT_WORD(nr);
 	_atomic_spin_lock_irqsave(addr, flags);
-	*addr &= mask;
+	*addr &= ~mask;
 	_atomic_spin_unlock_irqrestore(addr, flags);
 }

 static __inline__ void change_bit(int nr, volatile unsigned long * addr)
 {
-	unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr);
+	unsigned long mask = BIT_MASK(nr);
 	unsigned long flags;

-	addr += (nr >> SHIFT_PER_LONG);
+	addr += BIT_WORD(nr);
 	_atomic_spin_lock_irqsave(addr, flags);
 	*addr ^= mask;
 	_atomic_spin_unlock_irqrestore(addr, flags);
@@ -68,12 +53,12 @@ static __inline__ void change_bit(int nr, volatile unsigned long * addr)

 static __inline__ int test_and_set_bit(int nr, volatile unsigned long * addr)
 {
-	unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr);
+	unsigned long mask = BIT_MASK(nr);
 	unsigned long old;
 	unsigned long flags;
 	int set;

-	addr += (nr >> SHIFT_PER_LONG);
+	addr += BIT_WORD(nr);
 	_atomic_spin_lock_irqsave(addr, flags);
 	old = *addr;
 	set = (old & mask) ? 1 : 0;
@@ -86,12 +71,12 @@ static __inline__ int test_and_set_bit(int nr, volatile unsigned long * addr)

 static __inline__ int test_and_clear_bit(int nr, volatile unsigned long * addr)
 {
-	unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr);
+	unsigned long mask = BIT_MASK(nr);
 	unsigned long old;
 	unsigned long flags;
 	int set;

-	addr += (nr >> SHIFT_PER_LONG);
+	addr += BIT_WORD(nr);
 	_atomic_spin_lock_irqsave(addr, flags);
 	old = *addr;
 	set = (old & mask) ? 1 : 0;
@@ -104,11 +89,11 @@ static __inline__ int test_and_clear_bit(int nr, volatile unsigned long * addr)

 static __inline__ int test_and_change_bit(int nr, volatile unsigned long * addr)
 {
-	unsigned long mask = 1UL << CHOP_SHIFTCOUNT(nr);
+	unsigned long mask = BIT_MASK(nr);
 	unsigned long oldbit;
 	unsigned long flags;

-	addr += (nr >> SHIFT_PER_LONG);
+	addr += BIT_WORD(nr);
 	_atomic_spin_lock_irqsave(addr, flags);
 	oldbit = *addr;
 	*addr = oldbit ^ mask;
diff --git a/arch/parisc/mm/init.c b/arch/parisc/mm/init.c
index 48d628a1a0af..39ea464c8bd9 100644
--- a/arch/parisc/mm/init.c
+++ b/arch/parisc/mm/init.c
@@ -750,7 +750,7 @@ unsigned long alloc_sid(void)
 	free_space_ids--;

 	index = find_next_zero_bit(space_id, NR_SPACE_IDS, space_id_index);
-	space_id[index >> SHIFT_PER_LONG] |= (1L << (index & (BITS_PER_LONG - 1)));
+	space_id[BIT_WORD(index)] |= BIT_MASK(index);
 	space_id_index = index;

 	spin_unlock(&sid_lock);
@@ -761,16 +761,16 @@ unsigned long alloc_sid(void)
 void free_sid(unsigned long spaceid)
 {
 	unsigned long index = spaceid >> SPACEID_SHIFT;
-	unsigned long *dirty_space_offset;
+	unsigned long *dirty_space_offset, mask;

-	dirty_space_offset = dirty_space_id + (index >> SHIFT_PER_LONG);
-	index &= (BITS_PER_LONG - 1);
+	dirty_space_offset = &dirty_space_id[BIT_WORD(index)];
+	mask = BIT_MASK(index);

 	spin_lock(&sid_lock);

-	BUG_ON(*dirty_space_offset & (1L << index)); /* attempt to free space id twice */
+	BUG_ON(*dirty_space_offset & mask); /* attempt to free space id twice */

-	*dirty_space_offset |= (1L << index);
+	*dirty_space_offset |= mask;
 	dirty_space_ids++;

 	spin_unlock(&sid_lock);