diff options
author | Andrea Parri <parri.andrea@gmail.com> | 2024-01-31 15:49:33 +0100 |
---|---|---|
committer | Palmer Dabbelt <palmer@rivosinc.com> | 2024-02-15 08:04:11 -0800 |
commit | d6cfd1770f20392d7009ae1fdb04733794514fa9 (patch) | |
tree | c2cd9f5a579cd13931cc7e78536e4211aa91eae0 /mm | |
parent | 6613476e225e090cc9aad49be7fa504e290dd33d (diff) |
membarrier: riscv: Add full memory barrier in switch_mm()
The membarrier system call requires a full memory barrier after storing
to rq->curr, before going back to user-space. The barrier is only
needed when switching between processes: the barrier is implied by
mmdrop() when switching from kernel to userspace, and it's not needed
when switching from userspace to kernel.
Rely on the feature/mechanism ARCH_HAS_MEMBARRIER_CALLBACKS and on the
primitive membarrier_arch_switch_mm(), already adopted by the PowerPC
architecture, to insert the required barrier.
Fixes: fab957c11efe2f ("RISC-V: Atomic and Locking Code")
Signed-off-by: Andrea Parri <parri.andrea@gmail.com>
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://lore.kernel.org/r/20240131144936.29190-2-parri.andrea@gmail.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'mm')
0 files changed, 0 insertions, 0 deletions