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ea9156fb3b
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>
52 lines
1.1 KiB
C
52 lines
1.1 KiB
C
#ifndef UACCESS_H
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#define UACCESS_H
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#include <linux/compiler.h>
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extern void *__user_addr_min, *__user_addr_max;
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static inline void __chk_user_ptr(const volatile void *p, size_t size)
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{
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assert(p >= __user_addr_min && p + size <= __user_addr_max);
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}
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#define put_user(x, ptr) \
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({ \
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typeof(ptr) __pu_ptr = (ptr); \
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__chk_user_ptr(__pu_ptr, sizeof(*__pu_ptr)); \
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WRITE_ONCE(*(__pu_ptr), x); \
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0; \
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})
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#define get_user(x, ptr) \
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({ \
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typeof(ptr) __pu_ptr = (ptr); \
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__chk_user_ptr(__pu_ptr, sizeof(*__pu_ptr)); \
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x = READ_ONCE(*(__pu_ptr)); \
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0; \
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})
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static void volatile_memcpy(volatile char *to, const volatile char *from,
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unsigned long n)
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{
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while (n--)
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*(to++) = *(from++);
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}
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static inline int copy_from_user(void *to, const void __user volatile *from,
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unsigned long n)
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{
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__chk_user_ptr(from, n);
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volatile_memcpy(to, from, n);
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return 0;
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}
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static inline int copy_to_user(void __user volatile *to, const void *from,
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unsigned long n)
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{
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__chk_user_ptr(to, n);
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volatile_memcpy(to, from, n);
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return 0;
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}
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#endif /* UACCESS_H */
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