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bpf: Fix build for disabled CONFIG_DEBUG_INFO_BTF option

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Stephen reported following linker warnings on powerpc build:

  ld: warning: orphan section `.BTF_ids' from `kernel/trace/bpf_trace.o' being placed in section `.BTF_ids'
  ld: warning: orphan section `.BTF_ids' from `kernel/bpf/btf.o' being placed in section `.BTF_ids'
  ld: warning: orphan section `.BTF_ids' from `kernel/bpf/stackmap.o' being placed in section `.BTF_ids'
  ld: warning: orphan section `.BTF_ids' from `net/core/filter.o' being placed in section `.BTF_ids'
  ld: warning: orphan section `.BTF_ids' from `kernel/trace/bpf_trace.o' being placed in section `.BTF_ids'

It's because we generated .BTF_ids section even when
CONFIG_DEBUG_INFO_BTF is not enabled. Fixing this by
generating empty btf_id arrays for this case.

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/bpf/20200714102534.299280-1-jolsa@kernel.org
This commit is contained in:
Jiri Olsa 2020-07-14 12:25:33 +02:00 committed by Alexei Starovoitov
parent f7d40ee7ef
commit 079ef53673
1 changed files with 9 additions and 0 deletions
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9
include/linux/btf_ids.h
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@ -3,6 +3,8 @@
#ifndef _LINUX_BTF_IDS_H #ifndef _LINUX_BTF_IDS_H
#define _LINUX_BTF_IDS_H #define _LINUX_BTF_IDS_H
#ifdef CONFIG_DEBUG_INFO_BTF
#include <linux/compiler.h> /* for __PASTE */ #include <linux/compiler.h> /* for __PASTE */
/* /*
@ -83,5 +85,12 @@ asm( \
".zero 4 \n" \ ".zero 4 \n" \
".popsection; \n"); ".popsection; \n");
#else
#define BTF_ID_LIST(name) static u32 name[5];
#define BTF_ID(prefix, name)
#define BTF_ID_UNUSED
#endif /* CONFIG_DEBUG_INFO_BTF */
#endif #endif