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Date: Wed, 15 Jan 2020 12:05:17 -0800 From: Alexei Starovoitov <alexei.starovoitov@...il.com> To: Andrii Nakryiko <andriin@...com> Cc: bpf@...r.kernel.org, netdev@...r.kernel.org, ast@...com, daniel@...earbox.net, yhs@...com, andrii.nakryiko@...il.com, kernel-team@...com, Alexei Starovoitov <ast@...nel.org> Subject: Re: [PATCH v2 bpf-next] libbpf: support .text sub-calls relocations On Wed, Jan 15, 2020 at 11:08:56AM -0800, Andrii Nakryiko wrote: > The LLVM patch https://reviews.llvm.org/D72197 makes LLVM emit function call > relocations within the same section. This includes a default .text section, > which contains any BPF sub-programs. This wasn't the case before and so libbpf > was able to get a way with slightly simpler handling of subprogram call > relocations. > > This patch adds support for .text section relocations. It needs to ensure > correct order of relocations, so does two passes: > - first, relocate .text instructions, if there are any relocations in it; > - then process all the other programs and copy over patched .text instructions > for all sub-program calls. > > v1->v2: > - break early once .text program is processed. > > Cc: Yonghong Song <yhs@...com> > Cc: Alexei Starovoitov <ast@...nel.org> > Signed-off-by: Andrii Nakryiko <andriin@...com> Tested with the latest llvm trunk (which points to version 11 already) and all tests pass. Applied. Thanks
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