rslib: Split rs control struct

The decoder library uses variable length arrays on stack. To get rid of
them it would be simple to allocate fixed length arrays on stack, but those
might become rather large. The other solution is to allocate the buffers in
the rs control structure, but this cannot be done as long as the structure
can be shared by several users. Sharing is desired because the RS polynom
tables are large and initialization is time consuming.

To solve this split the codec information out of the control structure and
have a pointer to a shared codec in it. Instantiate the control structure
for each user, create a new codec if no shareable is avaiable yet.  Adjust
all affected usage sites to the new scheme.

This allows to add per instance decoder buffers to the control structure
later on.

Signed-off-by: Thomas Gleixner <[email protected]>
Acked-by: Boris Brezillon <[email protected]>
Cc: Tony Luck <[email protected]>
Cc: Kees Cook <[email protected]>
Cc: Segher Boessenkool <[email protected]>
Cc: Kernel Hardening <[email protected]>
Cc: Richard Weinberger <[email protected]>
Cc: Mike Snitzer <[email protected]>
Cc: Anton Vorontsov <[email protected]>
Cc: Colin Cross <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: David Woodhouse <[email protected]>
Cc: Alasdair Kergon <[email protected]>
Signed-off-by: Kees Cook <[email protected]>

0 files changed, 0 insertions, 0 deletions