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SubjectRe: 4.9.208 regression in perf building
It looks like 4.9.208 introduces a build regression for perf:

make -f /builddir/build/BUILD/kernel-4.9.208/linux-4.9.208-1.el7.x86_64/tools/build/Makefile.build
dir=. obj=perf
gcc -Wp,-MD,./.builtin-report.o.d,-MT,builtin-report.o
-Wbad-function-cast -Wdeclaration-after-statement -Wformat-security
-Wformat-y2k -Winit-self -Wmissing-declarations -Wmissing-prototypes
-Wnested-externs -Wno-system-headers -Wold-style-definition -Wpacked
-Wredundant-decls -Wshadow -Wstrict-aliasing=3 -Wstrict-prototypes
-Wswitch-default -Wswitch-enum -Wundef -Wwrite-strings -Wformat
-DHAVE_ARCH_X86_64_SUPPORT -DHAVE_SYSCALL_TABLE
-Iarch/x86/include/generated -DHAVE_PERF_REGS_SUPPORT
-DHAVE_ARCH_REGS_QUERY_REGISTER_OFFSET -O6 -fno-omit-frame-pointer
-ggdb3 -funwind-tables -Wall -Wextra -std=gnu99 -fstack-protector-all
-D_FORTIFY_SOURCE=2
-I/builddir/build/BUILD/kernel-4.9.208/linux-4.9.208-1.el7.x86_64/tools/perf/util/include
-I/builddir/build/BUILD/kernel-4.9.208/linux-4.9.208-1.el7.x86_64/tools/perf/arch/x86/include
-I/builddir/build/BUILD/kernel-4.9.208/linux-4.9.208-1.el7.x86_64/tools/include/uapi
-I/builddir/build/BUILD/kernel-4.9.208/linux-4.9.208-1.el7.x86_64/tools/include/
-I/builddir/build/BUILD/kernel-4.9.208/linux-4.9.208-1.el7.x86_64/tools/arch/x86/include/uapi
-I/builddir/build/BUILD/kernel-4.9.208/linux-4.9.208-1.el7.x86_64/tools/arch/x86/include/
-I/builddir/build/BUILD/kernel-4.9.208/linux-4.9.208-1.el7.x86_64/tools/arch/x86/
-I/builddir/build/BUILD/kernel-4.9.208/linux-4.9.208-1.el7.x86_64/tools/perf/util
-I/builddir/build/BUILD/kernel-4.9.208/linux-4.9.208-1.el7.x86_64/tools/perf
-I/builddir/build/BUILD/kernel-4.9.208/linux-4.9.208-1.el7.x86_64/tools/lib/
-D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -D_GNU_SOURCE
-DHAVE_SYNC_COMPARE_AND_SWAP_SUPPORT
-DHAVE_PTHREAD_ATTR_SETAFFINITY_NP -DHAVE_DWARF_GETLOCATIONS
-DHAVE_LIBELF_SUPPORT -DHAVE_LIBELF_MMAP_SUPPORT
-DHAVE_ELF_GETPHDRNUM_SUPPORT -DHAVE_GELF_GETNOTE_SUPPORT
-DHAVE_ELF_GETSHDRSTRNDX_SUPPORT -DHAVE_DWARF_SUPPORT
-DHAVE_LIBBPF_SUPPORT -DHAVE_BPF_PROLOGUE -DHAVE_SDT_EVENT
-DHAVE_JITDUMP -DHAVE_DWARF_UNWIND_SUPPORT -DHAVE_LIBAUDIT_SUPPORT
-DHAVE_LIBCRYPTO_SUPPORT -I/usr/include/slang -DHAVE_SLANG_SUPPORT
-DHAVE_TIMERFD_SUPPORT -DHAVE_LIBBFD_SUPPORT -DHAVE_ZLIB_SUPPORT
-DHAVE_LZMA_SUPPORT -DHAVE_BACKTRACE_SUPPORT -DHAVE_LIBNUMA_SUPPORT
-DHAVE_KVM_STAT_SUPPORT -DHAVE_AUXTRACE_SUPPORT -D"BUILD_STR(s)=#s"
-DTIPDIR="BUILD_STR(share/doc/perf-tip)"
-DDOCDIR="BUILD_STR(/builddir/build/BUILD/kernel-4.9.208/linux-4.9.208-1.el7.x86_64/tools/perf/Documentation)"
-c -o builtin-report.o builtin-report.c
builtin-report.c: In function ‘report__setup_sample_type’:
builtin-report.c:296:6: error: ‘dwarf_callchain_users’ undeclared
(first use in this function)
if (dwarf_callchain_users) {
^
builtin-report.c:296:6: note: each undeclared identifier is reported
only once for each function it appears in
mv: cannot stat ‘./.builtin-report.o.tmp’: No such file or directory
make[3]: *** [builtin-report.o] Error 1
make[2]: *** [perf-in.o] Error 2
make[1]: *** [sub-make] Error 2
make: *** [all] Error 2

4,9.207 works fine.

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