linux-kernel - Re: [PATCH 3/6] Input: Update vmmouse.c to use the common VMW

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Date:	Tue, 1 Dec 2015 14:24:14 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	Sinclair Yeh <syeh@...are.com>
Cc:	x86@...nel.org, pv-drivers@...are.com,
	linux-graphics-maintainer@...are.com,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	linux-input@...r.kernel.org
Subject: Re: [PATCH 3/6] Input: Update vmmouse.c to use the common VMW_PORT
 macros

On Tue, Dec 01, 2015 at 02:18:49PM -0800, Sinclair Yeh wrote:
> v2:
> Instead of replacing existing VMMOUSE defines, only modify enough
> to use the new VMW_PORT define.
> 
> v3:
> Use updated VMWARE_PORT() which requires hypervisor magic as an added
> parameter
> 
> Signed-off-by: Sinclair Yeh <syeh@...are.com>
> Reviewed-by: Thomas Hellstrom <thellstrom@...are.com>
> Reviewed-by: Alok N Kataria <akataria@...are.com>
> Cc: pv-drivers@...are.com
> Cc: linux-graphics-maintainer@...are.com
> Cc: Dmitry Torokhov <dmitry.torokhov@...il.com>
> Cc: Arnd Bergmann <arnd@...db.de>
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: linux-kernel@...r.kernel.org
> Cc: virtualization@...ts.linux-foundation.org
> Cc: linux-input@...r.kernel.org
> ---
>  drivers/input/mouse/vmmouse.c | 22 +++++++---------------
>  1 file changed, 7 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/input/mouse/vmmouse.c b/drivers/input/mouse/vmmouse.c
> index e272f06..d34e3e4 100644
> --- a/drivers/input/mouse/vmmouse.c
> +++ b/drivers/input/mouse/vmmouse.c
> @@ -19,6 +19,7 @@
>  #include <linux/slab.h>
>  #include <linux/module.h>
>  #include <asm/hypervisor.h>
> +#include <asm/vmware.h>
>  
>  #include "psmouse.h"
>  #include "vmmouse.h"
> @@ -84,21 +85,12 @@ struct vmmouse_data {
>   * implementing the vmmouse protocol. Should never execute on
>   * bare metal hardware.
>   */
> -#define VMMOUSE_CMD(cmd, in1, out1, out2, out3, out4)	\
> -({							\
> -	unsigned long __dummy1, __dummy2;		\
> -	__asm__ __volatile__ ("inl %%dx" :		\
> -		"=a"(out1),				\
> -		"=b"(out2),				\
> -		"=c"(out3),				\
> -		"=d"(out4),				\
> -		"=S"(__dummy1),				\
> -		"=D"(__dummy2) :			\
> -		"a"(VMMOUSE_PROTO_MAGIC),		\
> -		"b"(in1),				\
> -		"c"(VMMOUSE_PROTO_CMD_##cmd),		\
> -		"d"(VMMOUSE_PROTO_PORT) :		\
> -		"memory");		                \
> +#define VMMOUSE_CMD(cmd, in1, out1, out2, out3, out4)		   \
> +({								   \
> +	unsigned long __dummy1 = 0, __dummy2 = 0;		   \

Why do we need to initialize dummies?

> +	VMW_PORT(in1, VMMOUSE_PROTO_CMD_##cmd, VMMOUSE_PROTO_PORT, \
> +		 VMMOUSE_PROTO_MAGIC,				   \
> +		 out1, out2, out3, out4, __dummy1, __dummy2);      \
>  })
>  

Thanks.

-- 
Dmitry
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