ARM: 6519/1: kuser: Fix incorrect cmpxchg syscall in kuser helpers
The existing code invokes the syscall with rubbish in r7, due to what looks like an incorrect literal load idiom. Reviewed-by: NWill Deacon <will.deacon@arm.com> Signed-off-by: NDave Martin <dave.martin@linaro.org> Acked-by: NCatalin Marinas <catalin.marinas@arm.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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