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Subjectswitch in-kernel read/write calls to kernel_read/write V2
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Hi all,

this series moves almost all kernel callers of vfs_read/write and
friends to the kernel_read/write family that includes the set_fs calls
inside the called routines. The exceptions are the integrity code
(Mimi has a pending series for that one) and the splice readv code
which doesn't fit those helpers. But at least no modular users
are left.

Changes since V1:
- update f_pos under lock in ashmem
- use void * arguments for kernel_read, kernel_write and __kernel_write
- fix offset usage in cx25821 and target
- fixed fpos calculation in nommu do_mmap_private

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