[lkml]   [2020]   [Feb]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH 2/2] arm64: tlb: skip tlbi broadcast for single threaded TLB flushes

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.


 \ /
  Last update: 2020-02-12 13:58    [W:0.074 / U:2.596 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site