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Juergen Gross
6b09ca19d9
Add checking of lock recursion to the hypervisor. This is done by using a percpu data array for storing the address of each taken lock. Any attempt to take a lock twice (with the exception of recursive spinlocks) will result in a crash. This is especially meant for detecting attempts to take a rwlock multiple times as a reader, which will only result in a deadlock in case of another cpu trying to get the lock as a writer in between. The additional checks are not performance neutral, so they are enabled only in debug builds per default, as the checks are active only with CONFIG_DEBUG_LOCKS enabled. The size of the percpu data array can be selected via a boot parameter. Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: Jan Beulich <jbeulich@suse.com>
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