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Andrei Vagin authored
The order of vvar pages depends on whether a task belongs to the root time namespace or not. In the root time namespace, a task doesn't have a per-namespace page. In a non-root namespace, the VVAR page which contains the system-wide VDSO data is replaced with a namespace specific page that contains clock offsets. Whenever a task changes its namespace, the VVAR page tables are cleared and then they will be re-faulted with a corresponding layout. A task can switch its time namespace only if its ->mm isn't shared with another task. Signed-off-by:
Andrei Vagin <avagin@gmail.com> Reviewed-by:
Vincenzo Frascino <vincenzo.frascino@arm.com> Reviewed-by:
Dmitry Safonov <dima@arista.com> Reviewed-by:
Christian Brauner <christian.brauner@ubuntu.com> Link: https://lore.kernel.org/r/20200624083321.144975-3-avagin@gmail.comSigned-off-by:
Catalin Marinas <catalin.marinas@arm.com>
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