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| author | Dave Martin <Dave.Martin@arm.com> | 2019-06-03 16:35:02 +0100 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2019-06-05 13:05:28 +0100 |
| commit | 78ed70bf3a923f1965e3c19f544677d418397108 (patch) | |
| tree | eea8210beec14f5d0c85f793af4fea631ff4d74d /arch | |
| parent | 1e29ab3186e33c77dbb2d7566172a205b59fa390 (diff) | |
| download | linux-78ed70bf3a923f1965e3c19f544677d418397108.tar.bz2 | |
arm64: cpufeature: Fix missing ZFR0 in __read_sysreg_by_encoding()
In commit 06a916feca2b ("arm64: Expose SVE2 features for
userspace"), new hwcaps are added that are detected via fields in
the SVE-specific ID register ID_AA64ZFR0_EL1.
In order to check compatibility of secondary cpus with the hwcaps
established at boot, the cpufeatures code uses
__read_sysreg_by_encoding() to read this ID register based on the
sys_reg field of the arm64_elf_hwcaps[] table.
This leads to a kernel splat if an hwcap uses an ID register that
__read_sysreg_by_encoding() doesn't explicitly handle, as now
happens when exercising cpu hotplug on an SVE2-capable platform.
So fix it by adding the required case in there.
Fixes: 06a916feca2b ("arm64: Expose SVE2 features for userspace")
Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm64/kernel/cpufeature.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index ca27e08e3d8a..80babf451519 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -830,6 +830,7 @@ static u64 __read_sysreg_by_encoding(u32 sys_id) read_sysreg_case(SYS_ID_AA64PFR0_EL1); read_sysreg_case(SYS_ID_AA64PFR1_EL1); + read_sysreg_case(SYS_ID_AA64ZFR0_EL1); read_sysreg_case(SYS_ID_AA64DFR0_EL1); read_sysreg_case(SYS_ID_AA64DFR1_EL1); read_sysreg_case(SYS_ID_AA64MMFR0_EL1); |