Re: [PATCH 5.10] bpf: Fix mismatch memory accounting for devmap maps

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Fri, Sep 20, 2024 at 10:39:50AM +0000, Pu Lehui wrote:
> From: Pu Lehui <pulehui@huawei.com>
> 
> Commit 70294d8bc31f ("bpf: Eliminate rlimit-based memory accounting for
> devmap maps") relies on the v5.11+ basic mechanism of memcg-based memory
> accounting [0]. The commit cannot be independently backported to the
> 5.10 stable branch, otherwise the related memory when creating devmap
> will be unrestricted and the associated bpf selftest map_ptr will fail.
> Let's roll back to rlimit-based memory accounting mode for devmap and
> re-adapt the commit 225da02acdc9 ("bpf: Fix DEVMAP_HASH overflow check
> on 32-bit arches") to the 5.10 stable branch.
> 
> Link: https://lore.kernel.org/bpf/20201201215900.3569844-1-guro@fb.com [0]
> Fixes: 225da02acdc9 ("bpf: Fix DEVMAP_HASH overflow check on 32-bit arches")
> Fixes: 70294d8bc31f ("bpf: Eliminate rlimit-based memory accounting for devmap maps")

Should we just revert these changes instead?

thanks,

greg k-h