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author | 2024-01-31 15:49:33 +0100 | |
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committer | 2024-02-15 08:04:11 -0800 | |
commit | d6cfd1770f20392d7009ae1fdb04733794514fa9 (patch) | |
tree | c2cd9f5a579cd13931cc7e78536e4211aa91eae0 /tools/perf/scripts/python/export-to-postgresql.py | |
parent | Linux 6.8-rc1 (diff) | |
download | wireguard-linux-d6cfd1770f20392d7009ae1fdb04733794514fa9.tar.xz wireguard-linux-d6cfd1770f20392d7009ae1fdb04733794514fa9.zip |
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 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions