tree 502f8f067c7cc7ffcdd9042d404dc92e62b78f3c
parent 63104c06a9eddf53f88f6d16196bb036c62967b2
author Stefan Kristiansson <stefan.kristiansson@saunalahti.fi> 1399892906 +0300
committer Stafford Horne <shorne@gmail.com> 1487963558 +0900

openrisc: add atomic bitops

This utilize the load-link/store-conditional l.lwa and l.swa
instructions to implement the atomic bitops.
When those instructions are not available emulation is provided.

Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
[shorne@gmail.com: remove OPENRISC_HAVE_INST_LWA_SWA config suggesed by
Alan Cox https://lkml.org/lkml/2014/7/23/666, implement
test_and_change_bit]
Signed-off-by: Stafford Horne <shorne@gmail.com>