riscv/cmpxchg: Implement cmpxchg for variables of size 1 and 2

Browse source

cmpxchg for variables of size 1-byte and 2-bytes is not yet available for
riscv, even though its present in other architectures such as arm64 and
x86. This could lead to not being able to implement some locking mechanisms
or requiring some rework to make it work properly.

Implement 1-byte and 2-bytes cmpxchg in order to achieve parity with other
architectures.

Signed-off-by: Leonardo Bras <leobras@redhat.com>
Tested-by: Guo Ren <guoren@kernel.org>
Link: https://lore.kernel.org/r/20240103163203.72768-6-leobras@redhat.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>

...

This commit is contained in:

Leonardo Bras 2024-01-03 13:32:02 -03:00 • committed by Palmer Dabbelt

parent 9061237392

commit 54280ca646

No known key found for this signature in database

GPG key ID: 2E1319F35FBB1889

1 changed files with 34 additions and 0 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

34

arch/riscv/include/asm/cmpxchg.h

View file