locking, x86, iommu: Annotate iommu->register_lock as raw

The iommu->register_lock can be taken in atomic context and therefore
must not be preempted on -rt - annotate it.

In mainline this change documents the low level nature of
the lock - otherwise there's no functional difference. Lockdep
and Sparse checking will work as usual.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

1 files changed, 1 insertions, 1 deletions

diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
index 9310c699a37d..19728c462399 100644
--- a/include/linux/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -311,7 +311,7 @@ struct intel_iommu {
         u64             cap;
         u64             ecap;
         u32             gcmd; /* Holds TE, EAFL. Don't need SRTP, SFL, WBF */
-        spinlock_t      register_lock; /* protect register handling */
+        raw_spinlock_t  register_lock; /* protect register handling */
         int             seq_id; /* sequence id of the iommu */
         int             agaw; /* agaw of this iommu */
         int             msagaw; /* max sagaw of this iommu */