Messages in this thread | | | Date | Wed, 17 May 2023 01:08:42 -0700 | From | Christoph Hellwig <> | Subject | Re: [PATCH] tee: add FOLL_LONGTERM for CMA case when alloc shm |
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On Wed, May 17, 2023 at 01:22:51PM +0530, Sumit Garg wrote: > > > +#if IS_ENABLED(CONFIG_CMA) > > > + page_flag |= FOLL_LONGTERM; > > > +#endif > > > if (flags & TEE_SHM_USER_MAPPED) > > > > If this mapping is long live it should always use FOLL_LONGTERM. > > It depends on the userspace application needs. However, I think it > should be safe to use FOLL_LONGTERM by default to serve cases like > secure media playback.
long term is defined as won't automatically go away during the same syscall.
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