Commits
Stafford Horne committed 489e0f802db
openrisc: add 1 and 2 byte cmpxchg support OpenRISC only supports hardware instructions that perform 4 byte atomic operations. For enabling qrwlocks for upcoming SMP support 1 and 2 byte implementations are needed. To do this we leverage the 4 byte atomic operations and shift/mask the 1 and 2 byte areas as needed. This heavily borrows ideas and routines from sh and mips, which do something similar. Cc: Peter Zijlstra <peterz@infradead.org> Signed-off-by: Stafford Horne <shorne@gmail.com>