>Jeff Garzik wrote:
>> Do you know where there are some clear guidelines on the use of
>> pointers in a structure passed to an ioctl to lessen (or bypass)
>> 32<->64 compat ioctl thunking?
>
>Its impossible. If you pass pointers, you need to thunk.
>(Not even passing pointers via sysfs can avoid this.)
>Consider running a 32-bit app (with 32-bit pointers and 32-bit
>ABI) on a 64-bit kernel.
The drivers/scsi/megaraid/megaraid_mm.c simply calls regular ioctl
from within the compat_ioctl, though it does copy to and from the
userland pointers. This is done by adding appropriate padding.
Sincerely,
Sreenivas
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