arm64: entry: Reword comment about post_ttbr_update_workaround

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Commit f167211a93 upstream.

We don't fully understand the Cavium ThunderX erratum, but it appears
that mapping the kernel as nG can lead to horrible consequences such as
attempting to execute userspace from kernel context. Since kpti isn't
enabled for these CPUs anyway, simplify the comment justifying the lack
of post_ttbr_update_workaround in the exception trampoline.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Will Deacon 2018-01-29 11:59:58 +00:00 • committed by Greg Kroah-Hartman

parent e39247ca17

commit 8703f27d7c

1 changed files with 3 additions and 10 deletions

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arch/arm64/kernel/entry.S

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