linux-kernel - [PATCH 2/2] VMware balloon: export module version as module parameter

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Message-Id: <1281466725-22549-2-git-send-email-dtor@vmware.com>
Date:	Tue, 10 Aug 2010 11:58:45 -0700
From:	Dmitry Torokhov <dtor@...are.com>
To:	linux-kernel@...r.kernel.org
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Len Brown <lenb@...nel.org>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: [PATCH 2/2] VMware balloon: export module version as module parameter

To allow external tools detect presence of the driver in the kernel
when the driver is built in (as opposed to be compiled as a module)
export driver version as a read-only module parameter.

Signed-off-by: Dmitry Torokhov <dtor@...are.com>
---
 drivers/misc/vmware_balloon.c |   14 +++++++++++++-
 1 files changed, 13 insertions(+), 1 deletions(-)

diff --git a/drivers/misc/vmware_balloon.c b/drivers/misc/vmware_balloon.c
index 2a1e804..f9b2221 100644
--- a/drivers/misc/vmware_balloon.c
+++ b/drivers/misc/vmware_balloon.c
@@ -43,9 +43,11 @@
 #include <linux/seq_file.h>
 #include <asm/hypervisor.h>
 
+#define VMW_BALLOON_VERSION	"1.2.1.2-k"
+
 MODULE_AUTHOR("VMware, Inc.");
 MODULE_DESCRIPTION("VMware Memory Control (Balloon) Driver");
-MODULE_VERSION("1.2.1.1-k");
+MODULE_VERSION(VMW_BALLOON_VERSION);
 MODULE_ALIAS("dmi:*:svnVMware*:*");
 MODULE_ALIAS("vmware_vmmemctl");
 MODULE_LICENSE("GPL");
@@ -842,3 +844,13 @@ static void __exit vmballoon_exit(void)
 	vmballoon_pop(&balloon);
 }
 module_exit(vmballoon_exit);
+
+/*
+ * Make the driver version exported as module parameter so that the
+ * driver is still visible if it is compiled into kernel
+ */
+static int param_get_vmballoon_version(char *buffer, struct kernel_param *kp)
+{
+	return sprintf(buffer, "%s", VMW_BALLOON_VERSION);
+}
+module_param_call(version, NULL, param_get_vmballoon_version, NULL, S_IRUGO);
-- 
1.7.0

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