From bd6b0ac5be1a76ae6f6938b353154f6795692944 Mon Sep 17 00:00:00 2001
From: Jim Harris <jimharris@FreeBSD.org>
Date: Tue, 9 Jul 2013 21:24:19 +0000
Subject: [PATCH] Add comment explaining why CACHE_LINE_SIZE is defined in
 nvme_private.h if not already defined elsewhere.

Requested by:	attilio
MFC after:	3 days
---
 sys/dev/nvme/nvme_private.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sys/dev/nvme/nvme_private.h b/sys/dev/nvme/nvme_private.h
index 52d52fececd5..10643f22178c 100644
--- a/sys/dev/nvme/nvme_private.h
+++ b/sys/dev/nvme/nvme_private.h
@@ -109,6 +109,10 @@ MALLOC_DECLARE(M_NVME);
 /* Maximum log page size to fetch for AERs. */
 #define NVME_MAX_AER_LOG_SIZE		(4096)
 
+/*
+ * Define CACHE_LINE_SIZE here for older FreeBSD versions that do not define
+ *  it.
+ */
 #ifndef CACHE_LINE_SIZE
 #define CACHE_LINE_SIZE		(64)
 #endif