Re: [PATCH] generic-ipi: add lock context annotations

[Dan Carpenter]

On Tue, Nov 23, 2010 at 09:49:56AM +0100, Jens Axboe wrote:
> I guess what Peter means is that the fact that the function grabs the
> lock is apparent in the code, if sparse was a bit "smarter", it would
> see and note this itself.

The sparse warning messages should have been included in the commit
message.  Here they are:

kernel/smp.c:513:6: warning: context imbalance in 'ipi_call_lock' - wrong count at exit
kernel/smp.c:518:6: warning: context imbalance in 'ipi_call_unlock' - unexpected unlock
kernel/smp.c:523:6: warning: context imbalance in 'ipi_call_lock_irq' - wrong count at exit
kernel/smp.c:528:6: warning: context imbalance in 'ipi_call_unlock_irq' - unexpected unlock

What happens is that sparse *does* see that the locks are unlocked and
that's what it complains about.

Sparse works before the code is linked so this change doesn't affect
anything outside kernel/smp.c.  If we added these annotations to
include/linux/smp.h then they would be used for checking
kernel/smpboot.c

regards,
dan carpenter

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