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CONFIG_ARM64_ERRATUM_1742098: Cortex-A57/A72: 1742098: ELR recorded incorrectly on interrupt taken between cryptographic instructions in a sequence

General informations

The Linux kernel configuration item CONFIG_ARM64_ERRATUM_1742098:

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This option removes the AES hwcap for aarch32 user-space to workaround erratum 1742098 on Cortex-A57 and Cortex-A72.

Affected parts may corrupt the AES state if an interrupt is taken between a pair of AES instructions. These instructions are only present if the cryptography extensions are present. All software should have a fallback implementation for CPUs that don't implement the cryptography extensions.

If unsure, say Y.



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