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Date: Fri, 1 May 2020 13:05:51 +0900 From: Masahiro Yamada <masahiroy@...nel.org> To: Alexei Starovoitov <alexei.starovoitov@...il.com> Cc: Alexei Starovoitov <ast@...nel.org>, bpf <bpf@...r.kernel.org>, Networking <netdev@...r.kernel.org>, Daniel Borkmann <daniel@...earbox.net>, Martin KaFai Lau <kafai@...com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: BPFilter: bit size mismatch between bpfiter_umh and vmliux Hi Alexei, On Wed, Apr 29, 2020 at 1:14 AM Alexei Starovoitov <alexei.starovoitov@...il.com> wrote: > > > > At least, the build was successful, > > but does this work at runtime? > > > > If this is a bug, I can fix it cleanly. > > > > I think the bit size of the user mode helper > > should match to the kernel bit size. Is this correct? > > yes. they should match. > In theory we can have -m32 umh running on 64-bit kernel, > but I wouldn't bother adding support for such thing > until there is a use case. > Running 64-bit umh on 32-bit kernel is no go. Thanks for the comments. This issue will be fixed by this: https://patchwork.kernel.org/patch/11515997/ and the Makefile will be cleaned up by this: https://patchwork.kernel.org/patch/11515995/ They are parts of the big series of Makefile cleanups. So, I will apply the whole to kbuild tree. Thanks. -- Best Regards Masahiro Yamada
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