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The current version of the multiarch vDSO selftest verifies only gettimeofday. Extend the vDSO selftest to clock_getres, to verify that the syscall and the vDSO library function return the same information. The extension has been used to verify the hrtimer_resoltion fix. Cc: Shuah Khan <shuah@kernel.org> Signed-off-by: Vincenzo Frascino <vincenzo.frascino@arm.com> Acked-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>