__COPY_TO_USER_INATO - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : Memory Management in Linux

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NAME__copy_to_user_inatomic − Copy a block of data into user space, with less checking​.

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SYNOPSISunsigned long __must_check __copy_to_user_inatomic(void __user * to, const void * from, unsigned long n);

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ARGUMENTSto Destination address, in user space​. from Source address, in kernel space​. n Number of bytes to copy​.

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CONTEXTUser context only​.

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DESCRIPTIONCopy data from kernel space to user space​. Caller must check the specified block with access_ok before calling this function​. The caller should also make sure he pins the user space address so that we don´t result in page fault and sleep​. Here we special−case 1, 2 and 4−byte copy_*_user invocations​. On a fault we return the initial request size (1, 2 or 4), as copy_*_user should do​. If a store crosses a page boundary and gets a fault, the x86 will not write anything, so this is accurate​.

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