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Using gcc -Wshift-overflow=2 -Wsystem-headers to compile a file including <sys/mount.h> will cause a warning since 1 << 31 is undefined behavior on platforms where int is 32-bits. Signed-off-by: Collin Funk <collin.funk1@gmail.com> Tested-by: Carlos O'Donell <carlos@redhat.com> Reviewed-by: Carlos O'Donell <carlos@redhat.com>