arm64: tls: Avoid unconditional zeroing of tpidrro_el0 for native tasks

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Commit 18011eac28 upstream.

When unmapping the kernel at EL0, we use tpidrro_el0 as a scratch register
during exception entry from native tasks and subsequently zero it in
the kernel_ventry macro. We can therefore avoid zeroing tpidrro_el0
in the context-switch path for native tasks using the entry trampoline.

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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Will Deacon 2017-11-14 14:33:28 +00:00 • committed by Greg Kroah-Hartman

parent a5ed8761f8

commit 0b5deee12c

1 changed files with 5 additions and 7 deletions

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arch/arm64/kernel/process.c

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