diff options
| author | Peter Collingbourne <pcc@google.com> | 2021-07-13 18:36:38 -0700 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2021-07-28 18:40:12 +0100 |
| commit | afdfd93a53aea68837b34da81d442358ff7552f3 (patch) | |
| tree | fca4824cab040a175fa4513836edc6c07c9c6776 /lib/mpi/mpi-sub-ui.c | |
| parent | 80c7c36fb3ddea8e06f75822bfb7634f64d0edcb (diff) | |
arm64: mte: optimize GCR_EL1 modification on kernel entry/exit
Accessing GCR_EL1 and issuing an ISB can be expensive on some
microarchitectures. Although we must write to GCR_EL1, we can
restructure the code to avoid reading from it because the new value
can be derived entirely from the exclusion mask, which is already in
a GPR. Do so.
Signed-off-by: Peter Collingbourne <pcc@google.com>
Link: https://linux-review.googlesource.com/id/I560a190a74176ca4cc5191dad08f77f6b1577c75
Link: https://lore.kernel.org/r/20210714013638.3995315-1-pcc@google.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'lib/mpi/mpi-sub-ui.c')
0 files changed, 0 insertions, 0 deletions