linux-kernel - [PATCH v2] bitops kernel-doc: inline instead of macro

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Date:	Thu, 25 Oct 2007 09:31:59 -0700
From:	Randy Dunlap <rdunlap@...otime.net>
To:	Nick Piggin <nickpiggin@...oo.com.au>, tglx@...utronix.de,
	mingo@...hat.com, hpa@...or.com
Cc:	lkml <linux-kernel@...r.kernel.org>,
	torvalds <torvalds@...ux-foundation.org>,
	akpm <akpm@...ux-foundation.org>
Subject: [PATCH v2] bitops kernel-doc: inline instead of macro

On Wed, 24 Oct 2007 18:00:19 +1000 Nick Piggin wrote:

> On Wednesday 24 October 2007 15:09, Randy Dunlap wrote:
> > From: Randy Dunlap <randy.dunlap@...cle.com>
> >
> > Can we expand this macro definition, or should I look for a way to
> > fool^W teach kernel-doc about this?
> >
> > scripts/kernel-doc says:
> > Error(linux-2.6.24-rc1//include/asm-x86/bitops_32.h:188): cannot understand
> > prototype: 'test_and_set_bit_lock test_and_set_bit '
> 
> Actually, it probably looks a bit nicer like this anyway. If you grep
> for it, then you can actually see the parameters...
> 
> On third thoughts, an inline function might be the best thing to do,
> and also avoid setting a bad example. What do you think?

---

From: Randy Dunlap <randy.dunlap@...cle.com>

Use duplicated inline functions for test_and_set_bit_lock() on x86
instead of #define macros, thus avoiding a bad example.  This allows
kernel-doc to run cleanly instead of terminating with an error:

Error(linux-2.6.24-rc1//include/asm-x86/bitops_32.h:188): cannot understand prototype: 'test_and_set_bit_lock test_and_set_bit '

Signed-off-by: Randy Dunlap <randy.dunlap@...cle.com>
---
 include/asm-x86/bitops_32.h |   13 +++++++++++--
 include/asm-x86/bitops_64.h |   13 +++++++++++--
 2 files changed, 22 insertions(+), 4 deletions(-)

--- linux-2.6.24-rc1.orig/include/asm-x86/bitops_32.h
+++ linux-2.6.24-rc1/include/asm-x86/bitops_32.h
@@ -183,9 +183,18 @@ static inline int test_and_set_bit(int n
  * @nr: Bit to set
  * @addr: Address to count from
  *
- * This is the same as test_and_set_bit on x86
+ * This is the same as test_and_set_bit on x86.
  */
-#define test_and_set_bit_lock test_and_set_bit
+static inline int test_and_set_bit_lock(int nr, volatile unsigned long * addr)
+{
+	int oldbit;
+
+	__asm__ __volatile__( LOCK_PREFIX
+		"btsl %2,%1\n\tsbbl %0,%0"
+		:"=r" (oldbit),"+m" (ADDR)
+		:"Ir" (nr) : "memory");
+	return oldbit;
+}
 
 /**
  * __test_and_set_bit - Set a bit and return its old value
--- linux-2.6.24-rc1.orig/include/asm-x86/bitops_64.h
+++ linux-2.6.24-rc1/include/asm-x86/bitops_64.h
@@ -173,9 +173,18 @@ static __inline__ int test_and_set_bit(i
  * @nr: Bit to set
  * @addr: Address to count from
  *
- * This is the same as test_and_set_bit on x86
+ * This is the same as test_and_set_bit on x86.
  */
-#define test_and_set_bit_lock test_and_set_bit
+static __inline__ int test_and_set_bit_lock(int nr, volatile void * addr)
+{
+	int oldbit;
+
+	__asm__ __volatile__( LOCK_PREFIX
+		"btsl %2,%1\n\tsbbl %0,%0"
+		:"=r" (oldbit),ADDR
+		:"dIr" (nr) : "memory");
+	return oldbit;
+}
 
 /**
  * __test_and_set_bit - Set a bit and return its old value
-
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