On Mon, Apr 05, 2021 at 02:57:05PM +0300, Leon Romanovsky wrote: > On Mon, Apr 05, 2021 at 02:47:21PM +0300, Gal Pressman wrote: > > The new attribute indicates that the kernel copies DMA pages on fork, > > hence libibverbs' fork support through madvise and MADV_DONTFORK is not > > needed. > > > > The introduced attribute is always reported as supported since the > > kernel has the patch that added the copy-on-fork behavior. This allows > > the userspace library to identify older vs newer kernel versions. > > Extra care should be taken when backporting this patch as it relies on > > the fact that the copy-on-fork patch is merged, hence no check for > > support is added. > > Please be more specific, add SHA-1 of that patch and wrote the same > comment near "err = nla_put_u8(msg, RDMA_NLDEV_SYS_ATTR_COPY_ON_FORK, > 1);" line. And rdmatool should be updated too. Thanks
