linux-kernel - Re: [RT] seqlocks: use of PICK_FUNCTION breaks kernel compile when CONFIG_GENERIC

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Date:	Mon, 22 Oct 2007 11:53:03 -0700
From:	Daniel Walker <dwalker@...sta.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Remy Bohmer <linux@...mer.net>, Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	RT <linux-rt-users@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RT] seqlocks: use of PICK_FUNCTION breaks kernel compile when
	CONFIG_GENERIC_TIME is NOT set

On Wed, 2007-10-17 at 11:34 -0400, Steven Rostedt wrote:

> 
> Hmm, what about a __seq_irqsave_raw and __seq_nop?
> 
> That way it spells out that irqs are NOT touched if it is not a raw lock.

I took out the nop , and just did a save flags which makes sense.. There
is still more cleanup to do in that regard.

Signed-off-by: Daniel Walker <dwalker@...sta.com>

---
 include/linux/seqlock.h |   26 +++++++++++++++-----------
 1 file changed, 15 insertions(+), 11 deletions(-)

Index: linux-2.6.23/include/linux/seqlock.h
===================================================================
--- linux-2.6.23.orig/include/linux/seqlock.h
+++ linux-2.6.23/include/linux/seqlock.h
@@ -92,8 +92,11 @@ static inline void __write_seqlock(seqlo
 
 static __always_inline unsigned long __write_seqlock_irqsave(seqlock_t *sl)
 {
+	unsigned long flags;
+
+	local_save_flags(flags);
 	__write_seqlock(sl);
-	return 0;
+	return flags;
 }
 
 static inline void __write_sequnlock(seqlock_t *sl)
@@ -280,26 +283,27 @@ do {								\
 	PICK_SEQ_OP(__write_sequnlock_irq_raw, __write_sequnlock, lock)
 
 static __always_inline
-unsigned long __read_seqbegin_irqsave_raw(raw_seqlock_t *sl)
+unsigned long __seq_irqsave_raw(raw_seqlock_t *sl)
 {
 	unsigned long flags;
 
 	local_irq_save(flags);
-	__read_seqbegin_raw(sl);
 	return flags;
 }
 
-static __always_inline unsigned long __read_seqbegin_irqsave(seqlock_t *sl)
+static __always_inline unsigned long __seq_irqsave(seqlock_t *sl)
 {
-	__read_seqbegin(sl);
-	return 0;
+	unsigned long flags;
+
+	local_save_flags(flags);
+	return flags;
 }
 
-#define read_seqbegin_irqsave(lock, flags)			\
-do {								\
-	flags = PICK_SEQ_OP_RET(__read_seqbegin_irqsave_raw,	\
-		__read_seqbegin_irqsave, lock);			\
-} while (0)
+#define read_seqbegin_irqsave(lock, flags)				\
+({									\
+	flags = PICK_SEQ_OP_RET(__seq_irqsave_raw, __seq_irqsave, lock);\
+	read_seqbegin(lock);						\
+})
 
 static __always_inline int
 __read_seqretry_irqrestore(seqlock_t *sl, unsigned iv, unsigned long flags)


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