[PATCH] gcc4 compile fix for recent ia64 xpc changes

Gcc4 doesn't like volatile casts as lvalues.  Make the structure members
volatile instead.
Signed-off-by: Dave Jones <davej@redhat.com>
Cc: "Luck, Tony" <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

arch/ia64/sn/kernel/xpc.h

@@ -87,7 +87,7 @@ struct xpc_rsvd_page {
 	u8 partid;		/* partition ID from SAL */
 	u8 version;
 	u8 pad[6];		/* pad to u64 align */
-	u64 vars_pa;
+	volatile u64 vars_pa;
 	u64 part_nasids[XP_NASID_MASK_WORDS] ____cacheline_aligned;
 	u64 mach_nasids[XP_NASID_MASK_WORDS] ____cacheline_aligned;
 };
@@ -138,7 +138,7 @@ struct xpc_vars {
  * occupies half a cacheline.
  */
 struct xpc_vars_part {
-	u64 magic;
+	volatile u64 magic;
 
 	u64 openclose_args_pa;	/* physical address of open and close args */
 	u64 GPs_pa;		/* physical address of Get/Put values */
@@ -185,8 +185,8 @@ struct xpc_vars_part {
  * Define a Get/Put value pair (pointers) used with a message queue.
  */
 struct xpc_gp {
-	s64 get;	/* Get value */
-	s64 put;	/* Put value */
+	volatile s64 get;	/* Get value */
+	volatile s64 put;	/* Put value */
 };
 
 #define XPC_GP_SIZE \
@@ -231,7 +231,7 @@ struct xpc_openclose_args {
  */
 struct xpc_notify {
 	struct semaphore sema;		/* notify semaphore */
-	u8 type;			/* type of notification */
+	volatile u8 type;			/* type of notification */
 
 	/* the following two fields are only used if type == XPC_N_CALL */
 	xpc_notify_func func;		/* user's notify function */
@@ -439,7 +439,7 @@ struct xpc_partition {
 
 	/* XPC infrastructure referencing and teardown control */
 
-	u8 setup_state;			/* infrastructure setup state */
+	volatile u8 setup_state;			/* infrastructure setup state */
 	wait_queue_head_t teardown_wq;	/* kthread waiting to teardown infra */
 	atomic_t references;		/* #of references to infrastructure */
 

arch/ia64/sn/kernel/xpc_channel.c

@@ -209,7 +209,7 @@ xpc_setup_infrastructure(struct xpc_partition *part)
 	 * With the setting of the partition setup_state to XPC_P_SETUP, we're
 	 * declaring that this partition is ready to go.
 	 */
-	(volatile u8) part->setup_state = XPC_P_SETUP;
+	part->setup_state = XPC_P_SETUP;
 
 
 	/*
@@ -227,7 +227,7 @@ xpc_setup_infrastructure(struct xpc_partition *part)
 	xpc_vars_part[partid].IPI_phys_cpuid =
 					cpu_physical_id(smp_processor_id());
 	xpc_vars_part[partid].nchannels = part->nchannels;
-	(volatile u64) xpc_vars_part[partid].magic = XPC_VP_MAGIC1;
+	xpc_vars_part[partid].magic = XPC_VP_MAGIC1;
 
 	return xpcSuccess;
 }
@@ -355,7 +355,7 @@ xpc_pull_remote_vars_part(struct xpc_partition *part)
 
 		/* let the other side know that we've pulled their variables */
 
-		(volatile u64) xpc_vars_part[partid].magic = XPC_VP_MAGIC2;
+		xpc_vars_part[partid].magic = XPC_VP_MAGIC2;
 	}
 
 	if (pulled_entry->magic == XPC_VP_MAGIC1) {
@@ -1183,7 +1183,7 @@ xpc_process_msg_IPI(struct xpc_partition *part, int ch_number)
 		 */
 		xpc_clear_local_msgqueue_flags(ch);
 
-		(volatile s64) ch->w_remote_GP.get = ch->remote_GP.get;
+		ch->w_remote_GP.get = ch->remote_GP.get;
 
 		dev_dbg(xpc_chan, "w_remote_GP.get changed to %ld, partid=%d, "
 			"channel=%d\n", ch->w_remote_GP.get, ch->partid,
@@ -1211,7 +1211,7 @@ xpc_process_msg_IPI(struct xpc_partition *part, int ch_number)
 		 */
 		xpc_clear_remote_msgqueue_flags(ch);
 
-		(volatile s64) ch->w_remote_GP.put = ch->remote_GP.put;
+		ch->w_remote_GP.put = ch->remote_GP.put;
 
 		dev_dbg(xpc_chan, "w_remote_GP.put changed to %ld, partid=%d, "
 			"channel=%d\n", ch->w_remote_GP.put, ch->partid,
@@ -1875,7 +1875,7 @@ xpc_send_msg(struct xpc_channel *ch, struct xpc_msg *msg, u8 notify_type,
 		notify = &ch->notify_queue[msg_number % ch->local_nentries];
 		notify->func = func;
 		notify->key = key;
-		(volatile u8) notify->type = notify_type;
+		notify->type = notify_type;
 
 		// >>> is a mb() needed here?
 

arch/ia64/sn/kernel/xpc_partition.c

@@ -253,7 +253,7 @@ xpc_rsvd_page_init(void)
 	 * This signifies to the remote partition that our reserved
 	 * page is initialized.
 	 */
-	(volatile u64) rp->vars_pa = __pa(xpc_vars);
+	rp->vars_pa = __pa(xpc_vars);
 
 	return rp;
 }