Matt Evans 6246541522
locking/atomic: cmpxchg: Make __generic_cmpxchg_local compare against zero-extended 'old' value ...
__generic_cmpxchg_local takes unsigned long old/new arguments which
might end up being up-cast from smaller signed types (which will
sign-extend). The loaded compare value must be compared against a
truncated smaller type, so down-cast appropriately for each size.
The issue is apparent on 64-bit machines with code, such as
atomic_dec_unless_positive(), that sign-extends from int.
64-bit machines generally don't use the generic cmpxchg but
development/early ports might make use of it, so make it correct.
Signed-off-by: Matt Evans <mev@rivosinc.com >
Signed-off-by: Arnd Bergmann <arnd@arndb.de >
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