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e9c4962c5d
Fix the build dependency for virtio_test. The virtio_ring that is used from the test requires container_of_const(). Change to use container_of.h kernel header directly and adapt related codes. Signed-off-by: Shunsuke Mie <mie@igel.co.jp> Message-Id: <20230417022037.917668-2-mie@igel.co.jp> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
46 lines
933 B
C
46 lines
933 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#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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#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); \
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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); \
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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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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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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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