Messages in this thread | | | Date | Wed, 12 Feb 2020 07:57:57 -0500 | From | Andrea Arcangeli <> | Subject | Re: [PATCH 2/2] arm64: tlb: skip tlbi broadcast for single threaded TLB flushes |
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Hello,
On Tue, Feb 11, 2020 at 02:00:25PM +0000, Catalin Marinas wrote: > I think there is another race here. IIUC, the assumption you make is > that when mm_users <= 1 && mm_count == 1, the only active user of this > pgd/ASID is on the CPU doing the TLBI. This is not the case for > try_to_unmap() where the above condition may be true but the active > thread on a different CPU won't notice the local TLBI.
The "current->mm == mm" check is what shall prevent the above.
Thanks, Andrea
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