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linux/arch/arm64/tools
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Kristina Martsenko 479965a2b7 arm64: cpufeature: Fix CLRBHB and BC detection 
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: 356137e68a ("arm64/sysreg: Make BHB clear feature defines match the architecture")
Fixes: 8fcc8285c0 ("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>
History 2023-09-18 10:45:11 +01:00
..
cpucaps arm64: Add feature detection for fine grained traps 2023-08-17 10:00:27 +01:00
gen-cpucaps.awk arm64/cpucaps: increase string width to properly format cpucaps.h 2023-06-06 17:23:27 +01:00
gen-sysreg.awk arm64/sysreg: allow *Enum blocks in SysregFields blocks 2023-04-06 15:28:54 +01:00
Makefile arm64/sysreg: Enable automatic generation of system register definitions 2022-05-04 15:30:28 +01:00
sysreg arm64: cpufeature: Fix CLRBHB and BC detection 2023-09-18 10:45:11 +01:00