kiobuf using kernel pages
Keith Owens (kaos@ocs.com.au)
Thu, 11 Nov 1999 20:13:08 +1100
Trying to port the SGI lcrash code to 2.3.26 ix86. It compiles, runs,
traps the oops, starts writing the dump to swap, dies with -EFAULT in
sd_raw_rw. My guess is because the buffer address is c2c00000, i.e. I
am trying to do I/O directly from kernel pages, not from user space.
sd_raw_rw() calls map_user_kiobuf() which is perfect for user space
callers, no good for kernel callers. How do I get around this?
Changing sd_raw_rw to indicate if the caller is kernel or user would
work but is clumsy, all callers have to change. Can I map the kernel
pages into user space, if so how? Or would set_fs (get_ds()) fudge the
mappings enough to work?
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