On Tue, 2007-10-16 at 10:35 +0200, Remy Bohmer wrote:
> Hello Daniel and Ingo,
>
> I use 2.6.23-rt1 and the patch of Daniel below which seems to be in
> there breaks the compilation of the RT-kernel when CONFIG_GENERIC_TIME
> is NOT set.
>
> It breaks in the do_gettimeofday(struct timeval *tv) code in the
> architecture specific code
> where there is a call to: seq = read_seqbegin_irqsave(&xtime_lock, flags);
> The PICK_FUNCTION implementation does not return anything, so the
> compile breaks here.
>
> I am figuring out how to solve this problem nicely, but I have not
> found a nice solution yet. Attached I have put my hack to make it
> compile on ARM again, but maybe one of you can do a better proposal to
> fix this.
Here's another fix for this. I compile tested for ARM (!GENERIC_TIME) ,
but I didn't boot test .. Could you boot test this patch?
---
Move the read_seqbegin() call up in the chain so the value
can be returned
Signed-off-by: Daniel Walker <[email protected]>
---
include/linux/seqlock.h | 7 +++----
1 file changed, 3 insertions(+), 4 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
@@ -285,21 +285,20 @@ unsigned long __read_seqbegin_irqsave_ra
unsigned long flags;
local_irq_save(flags);
- __read_seqbegin_raw(sl);
return flags;
}
static __always_inline unsigned long __read_seqbegin_irqsave(seqlock_t *sl)
{
- __read_seqbegin(sl);
return 0;
}
#define read_seqbegin_irqsave(lock, flags) \
-do { \
+({ \
flags = PICK_SEQ_OP_RET(__read_seqbegin_irqsave_raw, \
__read_seqbegin_irqsave, lock); \
-} while (0)
+ read_seqbegin(lock); \
+})
static __always_inline int
__read_seqretry_irqrestore(seqlock_t *sl, unsigned iv, unsigned long flags)
-
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