diff options
| author | Peter Collingbourne <pcc@google.com> | 2021-07-09 05:35:32 +0300 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2021-07-27 20:12:18 +0300 |
| commit | 42b6b10a54f0bf00397511fc6d5b8a296b405563 (patch) | |
| tree | a191e4a0b12d002bf08c2a061dcfa9b4cb55a4a0 /arch/arm64/kernel/mte.c | |
| parent | ff1176468d368232b684f75e82563369208bc371 (diff) | |
| download | linux-42b6b10a54f0bf00397511fc6d5b8a296b405563.tar.xz | |
arm64: mte: avoid TFSRE0_EL1 related operations unless in async mode
There is no reason to touch TFSRE0_EL1 nor issue a DSB unless our task
is in asynchronous mode. Since these operations (especially the DSB) may
be expensive on certain microarchitectures, only perform them if
necessary.
Furthermore, stop clearing TFSRE0_EL1 on entry because it will be
cleared on exit and it is not necessary to have any particular value in
TFSRE0_EL1 between entry and exit.
Signed-off-by: Peter Collingbourne <pcc@google.com>
Link: https://linux-review.googlesource.com/id/Ib353a63e3d0abc2b0b008e96aa2d9692cfc1b815
Link: https://lore.kernel.org/r/20210709023532.2133673-1-pcc@google.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/kernel/mte.c')
0 files changed, 0 insertions, 0 deletions