Linus Torvalds wrote:
Implementing a kmap_pfn() sounds like a perfectly sane idea. But why does
it need to even be mapped into kernel space? Is it for the ELF header
reading or something (not having looked at the patch, just reacting to the
wrongness of using virt_to_phys())?
It needs to be mapped into kernel space to do regular file operations
other than mmap. In mm/filemap_xip.c we do access the xip memory from
kernel to fulfill sys_read/sys_write and friends [copy_from/to_user to
user's buffer].
so long,
Carsten
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