sgi-xp: support runtime selection of xp_max_npartitions

Support runtime selection of the max number of partitions based on the
hardware being run on.

Signed-off-by: Dean Nelson <dcn@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 7 insertions, 5 deletions

diff --git a/drivers/misc/sgi-xp/xpc.h b/drivers/misc/sgi-xp/xpc.h
index 11ac267ed68f..0f2affd01df1 100644
--- a/drivers/misc/sgi-xp/xpc.h
+++ b/drivers/misc/sgi-xp/xpc.h
@@ -210,7 +210,7 @@ xpc_disallow_hb(short partid, struct xpc_vars *vars)
  * the XPC running on the remote partition).
  */
 #define XPC_NOTIFY_IRQ_AMOS        0
-#define XPC_ACTIVATE_IRQ_AMOS      (XPC_NOTIFY_IRQ_AMOS + XP_MAX_PARTITIONS)
+#define XPC_ACTIVATE_IRQ_AMOS      (XPC_NOTIFY_IRQ_AMOS + XP_MAX_NPARTITIONS_SN2)
 #define XPC_ENGAGED_PARTITIONS_AMO (XPC_ACTIVATE_IRQ_AMOS + XP_NASID_MASK_WORDS)
 #define XPC_DISENGAGE_REQUEST_AMO  (XPC_ENGAGED_PARTITIONS_AMO + 1)
 
@@ -285,7 +285,7 @@ struct xpc_gp {
 };
 
 #define XPC_GP_SIZE \
-                L1_CACHE_ALIGN(sizeof(struct xpc_gp) * XPC_NCHANNELS)
+                L1_CACHE_ALIGN(sizeof(struct xpc_gp) * XPC_MAX_NCHANNELS)
 
 /*
  * Define a structure that contains arguments associated with opening and
@@ -300,7 +300,8 @@ struct xpc_openclose_args {
 };
 
 #define XPC_OPENCLOSE_ARGS_SIZE \
-              L1_CACHE_ALIGN(sizeof(struct xpc_openclose_args) * XPC_NCHANNELS)
+              L1_CACHE_ALIGN(sizeof(struct xpc_openclose_args) * \
+              XPC_MAX_NCHANNELS)
 
 /* struct xpc_msg flags */
 
@@ -637,7 +638,7 @@ extern int xpc_exiting;
 extern struct xpc_vars *xpc_vars;
 extern struct xpc_rsvd_page *xpc_rsvd_page;
 extern struct xpc_vars_part *xpc_vars_part;
-extern struct xpc_partition xpc_partitions[XP_MAX_PARTITIONS + 1];
+extern struct xpc_partition *xpc_partitions;
 extern char *xpc_remote_copy_buffer;
 extern void *xpc_remote_copy_buffer_base;
 extern void *xpc_kmalloc_cacheline_aligned(size_t, gfp_t, void **);
@@ -1104,13 +1105,14 @@ xpc_IPI_send_local_msgrequest(struct xpc_channel *ch)
 }
 
 /*
+>>> this block comment needs to be moved and re-written.
  * Memory for XPC's AMO variables is allocated by the MSPEC driver. These
  * pages are located in the lowest granule. The lowest granule uses 4k pages
  * for cached references and an alternate TLB handler to never provide a
  * cacheable mapping for the entire region. This will prevent speculative
  * reading of cached copies of our lines from being issued which will cause
  * a PI FSB Protocol error to be generated by the SHUB. For XPC, we need 64
- * AMO variables (based on XP_MAX_PARTITIONS) for message notification and an
+ * AMO variables (based on xp_max_npartitions) for message notification and an
  * additional 128 AMO variables (based on XP_NASID_MASK_WORDS) for partition
  * activation and 2 AMO variables for partition deactivation.
  */