[tip:x86/platform] x86/platform/uv/BAU: Clean up pq_init()

[tip-bot for Andrew Banman]

Commit-ID:  d2a57afa53f3fdf9f68d1f4240ace85a7d20ca20
Gitweb:     http://git.kernel.org/tip/d2a57afa53f3fdf9f68d1f4240ace85a7d20ca20
Author:     Andrew Banman <abanman@xxxxxxx>
AuthorDate: Wed, 21 Sep 2016 11:09:14 -0500
Committer:  Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Thu, 22 Sep 2016 11:16:13 +0200

x86/platform/uv/BAU: Clean up pq_init()

The payload queue first MMR requires the physical memory address and hub
GNODE of where the payload queue resides in memory, but the associated
variables are named as if the PNODE were used. Rename gnode-related
variables and clarify the definitions of the payload queue head, last, and
tail pointers.

Signed-off-by: Andrew Banman <abanman@xxxxxxx>
Acked-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Acked-by: Mike Travis <travis@xxxxxxx>
Acked-by: Dimitri Sivanich <sivanich@xxxxxxx>
Acked-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: akpm@xxxxxxxxxxxxxxxxxxxx
Cc: rja@xxxxxxx
Link: http://lkml.kernel.org/r/1474474161-265604-4-git-send-email-abanman@xxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
 arch/x86/include/asm/uv/uv_bau.h |  2 +-
 arch/x86/platform/uv/tlb_uv.c    | 19 ++++++++-----------
 2 files changed, 9 insertions(+), 12 deletions(-)

diff --git a/arch/x86/include/asm/uv/uv_bau.h b/arch/x86/include/asm/uv/uv_bau.h
index cc44d92..cc058c6 100644
--- a/arch/x86/include/asm/uv/uv_bau.h
+++ b/arch/x86/include/asm/uv/uv_bau.h
@@ -49,7 +49,7 @@
 #define UV_NET_ENDPOINT_INTD		(is_uv1_hub() ?			\
 			UV1_NET_ENDPOINT_INTD : UV2_NET_ENDPOINT_INTD)
 #define UV_DESC_PSHIFT			49
-#define UV_PAYLOADQ_PNODE_SHIFT		49
+#define UV_PAYLOADQ_GNODE_SHIFT		49
 #define UV_PTC_BASENAME			"sgi_uv/ptc_statistics"
 #define UV_BAU_BASENAME			"sgi_uv/bau_tunables"
 #define UV_BAU_TUNABLES_DIR		"sgi_uv"
diff --git a/arch/x86/platform/uv/tlb_uv.c b/arch/x86/platform/uv/tlb_uv.c
index 8462fd1..f6bc43b 100644
--- a/arch/x86/platform/uv/tlb_uv.c
+++ b/arch/x86/platform/uv/tlb_uv.c
@@ -1790,10 +1790,7 @@ static void pq_init(int node, int pnode)
 	size_t plsize;
 	char *cp;
 	void *vp;
-	unsigned long pn;
-	unsigned long first;
-	unsigned long pn_first;
-	unsigned long last;
+	unsigned long gnode, first, last, tail;
 	struct bau_pq_entry *pqp;
 	struct bau_control *bcp;
 
@@ -1814,16 +1811,16 @@ static void pq_init(int node, int pnode)
 		bcp->bau_msg_head	= pqp;
 		bcp->queue_last		= pqp + (DEST_Q_SIZE - 1);
 	}
-	/*
-	 * need the gnode of where the memory was really allocated
-	 */
-	pn = uv_gpa_to_gnode(uv_gpa(pqp));
+
 	first = uv_physnodeaddr(pqp);
-	pn_first = ((unsigned long)pn << UV_PAYLOADQ_PNODE_SHIFT) | first;
 	last = uv_physnodeaddr(pqp + (DEST_Q_SIZE - 1));
-	write_mmr_payload_first(pnode, pn_first);
-	write_mmr_payload_tail(pnode, first);
+	tail = first;
+	gnode = uv_gpa_to_gnode(uv_gpa(pqp));
+	first = (gnode << UV_PAYLOADQ_GNODE_SHIFT) | tail;
+
+	write_mmr_payload_first(pnode, first);
 	write_mmr_payload_last(pnode, last);
+	write_mmr_payload_tail(pnode, tail);
 	write_gmmr_sw_ack(pnode, 0xffffUL);
 
 	/* in effect, all msg_type's are set to MSG_NOOP */