Re: [PATCH] tee: add FOLL_LONGTERM for CMA case when alloc shm
From: Christoph Hellwig <hch@infradead.org>
Date: 2023-05-17 08:08:51
Also in:
linux-mediatek, linux-mm, lkml, op-tee
On Wed, May 17, 2023 at 01:22:51PM +0530, Sumit Garg wrote:
quoted
quoted
+#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. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel