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tools/virtio: use {READ,WRITE}_ONCE() in uaccess.h

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As a step towards killing off ACCESS_ONCE, use {READ,WRITE}_ONCE() for the
virtio tools uaccess primitives, pulling these in from <linux/compiler.h>.

With this done, we can kill off the now-unused ACCESS_ONCE() definition.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: linux-kernel@vger.kernel.org
Cc: virtualization@lists.linux-foundation.org
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Reviewed-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Mark Rutland 2016-11-24 10:25:14 +00:00 • committed by Michael S. Tsirkin
parent 9d1b972f8a
commit ea9156fb3b
1 changed files with 5 additions and 4 deletions
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9
tools/virtio/linux/uaccess.h
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@ -1,8 +1,9 @@
#ifndef UACCESS_H #ifndef UACCESS_H
#define UACCESS_H #define UACCESS_H
extern void *__user_addr_min, *__user_addr_max;
#define ACCESS_ONCE(x) (*(volatile typeof(x) *)&(x)) #include <linux/compiler.h>
extern void *__user_addr_min, *__user_addr_max;
static inline void __chk_user_ptr(const volatile void *p, size_t size) static inline void __chk_user_ptr(const volatile void *p, size_t size)
{ {
@ -13,7 +14,7 @@ static inline void __chk_user_ptr(const volatile void *p, size_t size)
({ \ ({ \
typeof(ptr) __pu_ptr = (ptr); \ typeof(ptr) __pu_ptr = (ptr); \
__chk_user_ptr(__pu_ptr, sizeof(*__pu_ptr)); \ __chk_user_ptr(__pu_ptr, sizeof(*__pu_ptr)); \
ACCESS_ONCE(*(__pu_ptr)) = x; \ WRITE_ONCE(*(__pu_ptr), x); \
0; \ 0; \
}) })
@ -21,7 +22,7 @@ static inline void __chk_user_ptr(const volatile void *p, size_t size)
({ \ ({ \
typeof(ptr) __pu_ptr = (ptr); \ typeof(ptr) __pu_ptr = (ptr); \
__chk_user_ptr(__pu_ptr, sizeof(*__pu_ptr)); \ __chk_user_ptr(__pu_ptr, sizeof(*__pu_ptr)); \
x = ACCESS_ONCE(*(__pu_ptr)); \ x = READ_ONCE(*(__pu_ptr)); \
0; \ 0; \
}) })