diff options
| author | Kristina Martsenko <kristina.martsenko@arm.com> | 2023-09-12 14:34:29 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-10-10 22:02:55 +0200 |
| commit | 0b37467cbd2d611d720ea3d3c8b0cf9d42e854ad (patch) | |
| tree | 16fb23600a19d63e105fab5b7b7f2691a15d5601 /include/uapi/linux | |
| parent | a39c82f6d9cbe594c2f1501f48d03db1a4a556a9 (diff) | |
arm64: cpufeature: Fix CLRBHB and BC detection
[ Upstream commit 479965a2b7ec481737df0cadf553331063b9c343 ]
ClearBHB support is indicated by the CLRBHB field in ID_AA64ISAR2_EL1.
Following some refactoring the kernel incorrectly checks the BC field
instead. Fix the detection to use the right field.
(Note: The original ClearBHB support had it as FTR_HIGHER_SAFE, but this
patch uses FTR_LOWER_SAFE, which seems more correct.)
Also fix the detection of BC (hinted conditional branches) to use
FTR_LOWER_SAFE, so that it is not reported on mismatched systems.
Fixes: 356137e68a9f ("arm64/sysreg: Make BHB clear feature defines match the architecture")
Fixes: 8fcc8285c0e3 ("arm64/sysreg: Convert ID_AA64ISAR2_EL1 to automatic generation")
Cc: stable@vger.kernel.org
Signed-off-by: Kristina Martsenko <kristina.martsenko@arm.com>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20230912133429.2606875-1-kristina.martsenko@arm.com
Signed-off-by: Will Deacon <will@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include/uapi/linux')
0 files changed, 0 insertions, 0 deletions