arm64: mm: Remove pre_ttbr0_update_workaround for Falkor erratum #E1003

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Commit 85d13c0014 upstream.

The pre_ttbr0_update_workaround hook is called prior to context-switching
TTBR0 because Falkor erratum E1003 can cause TLB allocation with the wrong
ASID if both the ASID and the base address of the TTBR are updated at
the same time.

With the ASID sitting safely in TTBR1, we no longer update things
atomically, so we can remove the pre_ttbr0_update_workaround macro as
it's no longer required. The erratum infrastructure and documentation
is left around for #E1003, as it will be required by the entry
trampoline code in a future patch.

Reviewed-by: Mark Rutland <mark.rutland@arm.com>
Tested-by: Laura Abbott <labbott@redhat.com>
Tested-by: Shanker Donthineni <shankerd@codeaurora.org>
Signed-off-by: Will Deacon <will.deacon@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 2017-08-10 13:29:06 +01:00 • committed by Greg Kroah-Hartman

parent d26f0a5dc6

commit 4445cb0441

4 changed files with 0 additions and 36 deletions

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22

arch/arm64/include/asm/assembler.h

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2

arch/arm64/include/asm/mmu_context.h

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11

arch/arm64/mm/context.c

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1

arch/arm64/mm/proc.S

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