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| author |   James Morse <james.morse@arm.com> | 2022-09-09 17:59:38 +0100 |
|---|---|---|
| committer |   Catalin Marinas <catalin.marinas@arm.com> | 2022-09-16 15:23:50 +0100 |
| commit | 1bdb0fbb2e27c51a6f311867726462c983a1d9ee (patch) | |
| tree | 729c45d634d041e7e6e9a306d91c6692011664a9 /Documentation/arm64 | |
| parent | arm64: cpufeature: Expose get_arm64_ftr_reg() outside cpufeature.c (diff) | |
| download | linux-dev-1bdb0fbb2e27c51a6f311867726462c983a1d9ee.tar.xz linux-dev-1bdb0fbb2e27c51a6f311867726462c983a1d9ee.zip | |
arm64: errata: remove BF16 HWCAP due to incorrect result on Cortex-A510
Cortex-A510's erratum #2658417 causes two BF16 instructions to return the
wrong result in rare circumstances when a pair of A510 CPUs are using
shared neon hardware.
The two instructions affected are BFMMLA and VMMLA, support for these is
indicated by the BF16 HWCAP. Remove it on affected platforms.
Signed-off-by: James Morse <james.morse@arm.com>
Link: https://lore.kernel.org/r/20220909165938.3931307-4-james.morse@arm.com
[catalin.marinas@arm.com: add revision to the Kconfig help; remove .type]
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'Documentation/arm64')
| -rw-r--r-- | Documentation/arm64/silicon-errata.rst | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/arm64/silicon-errata.rst b/Documentation/arm64/silicon-errata.rst index fda97b3fcf01..17d9fc5d14fb 100644 --- a/Documentation/arm64/silicon-errata.rst +++ b/Documentation/arm64/silicon-errata.rst @@ -110,6 +110,8 @@ stable kernels. +----------------+-----------------+-----------------+-----------------------------+ | ARM | Cortex-A510 | #2441009 | ARM64_ERRATUM_2441009 | +----------------+-----------------+-----------------+-----------------------------+ +| ARM | Cortex-A510 | #2658417 | ARM64_ERRATUM_2658417 | ++----------------+-----------------+-----------------+-----------------------------+ | ARM | Cortex-A710 | #2119858 | ARM64_ERRATUM_2119858 | +----------------+-----------------+-----------------+-----------------------------+ | ARM | Cortex-A710 | #2054223 | ARM64_ERRATUM_2054223 | |