Check this out:
drivers/infiniband/core/cache.c
function: ib_cache_gid_add
Line: 338
mutex_lock(&table->lock);
write_lock_irq(&table->rwlock);
.
.
.
.
write_unlock_irq(&table->rwlock);
mutex_unlock(&table->lock);
On Thu, Feb 25, 2016 at 3:42 PM, priyaranjan <[email protected]>
wrote:
> >On Thu, Feb 25, 2016 at 2:53 PM, Devesh Sharma <[email protected]>
> wrote:
> >Hi
>
> >In running kernel there are many places you can look to get the usage.
> But the bottom line is
>
> Can you tell me the specific use case? or give me the file name/driver
> where this is used.
>
> >* You can take a spinlock under a mutex. e.g.
> mutex_lock--->spinlock-----critical section-----spinunlock--->mutex_unlock.
>
> >* You can not take a mutex under a spinlock. e.g. spinlock--->mutex_lock
> -----critical section ....mutex_unlock---->spinunlock is not allowed.
>
>
> On Thu, Feb 25, 2016 at 11:37 AM, priyaranjan <[email protected]>
> wrote:
> Hello All,
>
> Do you have any idea of a situation where we would need mutex and spinlock
> to be locked together? I think there is an example for this in Linux
> kernel. Can anyone help me?
>
> Regards,
> Priyaranjan
>
> _______________________________________________
> Kernelnewbies mailing list
> [email protected]
> http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
>
>
>
>
--
Please don't print this E- mail unless you really need to - this will
preserve trees on planet earth.
_______________________________________________
Kernelnewbies mailing list
[email protected]
http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
