linux-kernel - 5.19-rc1 build fails at scripts/check-local-export

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Date:   Mon, 6 Jun 2022 14:49:42 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Sedat Dilek <sedat.dilek@...il.com>,
        LKML <linux-kernel@...r.kernel.org>
Subject: 5.19-rc1 build fails at scripts/check-local-export

Hello.

Commit 31cb50b5590fe911 ("kbuild: check static EXPORT_SYMBOL* by script
instead of modpost") introduced scripts/check-local-export but it fails
in my CentOS 7 environment.

$ rpm -q binutils bash
binutils-2.27-44.base.el7_9.1.x86_64
bash-4.2.46-35.el7_9.x86_64
$ make
  SYSHDR  arch/x86/include/generated/uapi/asm/unistd_32.h
  SYSHDR  arch/x86/include/generated/uapi/asm/unistd_64.h
  SYSHDR  arch/x86/include/generated/uapi/asm/unistd_x32.h
  SYSTBL  arch/x86/include/generated/asm/syscalls_32.h
  SYSHDR  arch/x86/include/generated/asm/unistd_32_ia32.h
  SYSHDR  arch/x86/include/generated/asm/unistd_64_x32.h
  SYSTBL  arch/x86/include/generated/asm/syscalls_64.h
  HOSTCC  scripts/basic/fixdep
  HOSTCC  arch/x86/tools/relocs_32.o
  HOSTCC  arch/x86/tools/relocs_64.o
  HOSTCC  arch/x86/tools/relocs_common.o
  HOSTLD  arch/x86/tools/relocs
  HOSTCC  scripts/genksyms/genksyms.o
  YACC    scripts/genksyms/parse.tab.[ch]
  HOSTCC  scripts/genksyms/parse.tab.o
  LEX     scripts/genksyms/lex.lex.c
  HOSTCC  scripts/genksyms/lex.lex.o
  HOSTLD  scripts/genksyms/genksyms
  HOSTCC  scripts/bin2c
  HOSTCC  scripts/kallsyms
  HOSTCC  scripts/sorttable
  HOSTCC  scripts/asn1_compiler
  HOSTCC  scripts/mod/mk_elfconfig
  CC      scripts/mod/empty.o
./scripts/check-local-export: line 54: wait: pid 17328 is not a child of this shell
make[2]: *** [scripts/mod/empty.o] Error 127
make[2]: *** Deleting file `scripts/mod/empty.o'
make[1]: *** [prepare0] Error 2
make: *** [__sub-make] Error 2

Is below change OK for you?

diff --git a/scripts/check-local-export b/scripts/check-local-export
index da745e2743b7..1631c79558b7 100755
--- a/scripts/check-local-export
+++ b/scripts/check-local-export
@@ -51,7 +51,7 @@ do
 done < <(${NM} ${1} 2>/dev/null || { echo "${0}: ${NM} failed" >&2; false; } )
 
 # Catch error in the process substitution
-wait $!
+wait $! 2>/dev/null || :
 
 for name in "${export_symbols[@]}"
 do