1__COPY_TO_USER_INATO(9)   Memory Management in Linux   __COPY_TO_USER_INATO(9)
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NAME

6       __copy_to_user_inatomic - Copy a block of data into user space, with
7       less checking.
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SYNOPSIS

10       unsigned long __must_check __copy_to_user_inatomic(void __user * to,
11                                                          const void * from,
12                                                          unsigned long n);
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ARGUMENTS

15       to
16           Destination address, in user space.
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18       from
19           Source address, in kernel space.
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21       n
22           Number of bytes to copy.
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CONTEXT

25       User context only.
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DESCRIPTION

28       Copy data from kernel space to user space. Caller must check the
29       specified block with access_ok before calling this function. The caller
30       should also make sure he pins the user space address so that we don´t
31       result in page fault and sleep.
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33       Here we special-case 1, 2 and 4-byte copy_*_user invocations. On a
34       fault we return the initial request size (1, 2 or 4), as copy_*_user
35       should do. If a store crosses a page boundary and gets a fault, the x86
36       will not write anything, so this is accurate.
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39Kernel Hackers Manual 2.6.         June 2019           __COPY_TO_USER_INATO(9)
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