gru: check context state on reload

Check whether the gru state being loaded into a gru is from a new context
or a previously unloaded context.  If new, simply zero out the hardware
context; if unloaded and valid, reload the old state.

This change is primarily for reloading kernel contexts where the previous
is not required to be saved.

Signed-off-by: Jack Steiner <steiner@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/misc/sgi-gru/grutables.h b/drivers/misc/sgi-gru/grutables.h
index 1c85fdcf5d37..5f8f3bda2fa9 100644
--- a/drivers/misc/sgi-gru/grutables.h
+++ b/drivers/misc/sgi-gru/grutables.h
@@ -385,6 +385,8 @@ struct gru_thread_state {
                                                    after migration */
         char                    ts_cbr_idx[GRU_CBR_AU];/* CBR numbers of each
                                                           allocated CB */
+        int                     ts_data_valid;  /* Indicates if ts_gdata has
+                                                   valid data */
         unsigned long           ts_gdata[0];    /* save area for GRU data (CB,
                                                    DS, CBE) */
 };