Hi,
On Wed, Nov 24, 2021 at 12:54:38PM +0100, Greg Kroah-Hartman wrote:
> From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
>
> [ Upstream commit ce0b9c805dd66d5e49fd53ec5415ae398f4c56e6 ]
>
> vmlinux.o: warning: objtool: look_up_lock_class()+0xc7: call to rcu_read_lock_any_held() leaves .noinstr.text section
For 4.19.218 at least this commit seems to cause a build failure for
cpupower, if warnings are treated as errors, I have not seen the same
for the 5.10.80 build:
gcc -g -O2 -fstack-protector-strong -Wformat -Werror=format-security -DVERSION=\"4.19\" -DPACKAGE=\"cpupower\" -DPACKAGE_BUGREPORT=\"Debian\ \(reportbug\ linux-cpupower\)\" -D_GNU_SOURCE -pipe -DNLS -Wall -Wchar-subscripts -Wpointer-arith
-Wsign-compare -Wno-pointer-sign -Wdeclaration-after-statement -Wshadow -Os -fomit-frame-pointer -fPIC -o /home/build/linux-4.19.218/debian/build/build-tools/tools/power/cpupower/lib/cpupower.o -c lib/cpupower.c
In file included from lockdep.c:28:
../../../kernel/locking/lockdep.c: In function ‘look_up_lock_class’:
../../../kernel/locking/lockdep.c:694:2: error: implicit declaration of function ‘hlist_for_each_entry_rcu_notrace’; did you mean ‘hlist_for_each_entry_continue’? [-Werror=implicit-function-declaration]
hlist_for_each_entry_rcu_notrace(class, hash_head, hash_entry) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
hlist_for_each_entry_continue
../../../kernel/locking/lockdep.c:694:53: error: ‘hash_entry’ undeclared (first use in this function); did you mean ‘hash_ptr’?
hlist_for_each_entry_rcu_notrace(class, hash_head, hash_entry) {
^~~~~~~~~~
hash_ptr
../../../kernel/locking/lockdep.c:694:53: note: each undeclared identifier is reported only once for each function it appears in
../../../kernel/locking/lockdep.c:694:64: error: expected ‘;’ before ‘{’ token
hlist_for_each_entry_rcu_notrace(class, hash_head, hash_entry) {
^~
;
../../../kernel/locking/lockdep.c:706:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^
cc1: some warnings being treated as errors
make[5]: *** [/home/build/linux-4.19.218/tools/build/Makefile.build:97: /home/build/linux-4.19.218/debian/build/build-tools/tools/lib/lockdep/lockdep.o] Error 1
make[4]: *** [Makefile:121: /home/build/linux-4.19.218/debian/build/build-tools/tools/lib/lockdep/liblockdep-in.o] Error 2
make[4]: Leaving directory '/home/build/linux-4.19.218/tools/lib/lockdep'
make[3]: *** [/home/build/linux-4.19.218/debian/rules.d/tools/lib/lockdep/Makefile:16: all] Error 2
make[3]: Leaving directory '/home/build/linux-4.19.218/debian/build/build-tools/tools/lib/lockdep'
make[2]: *** [debian/rules.real:795: build-liblockdep] Error 2
make[2]: *** Waiting for unfinished jobs....
I was not yet able to look further on it.
Regards,
Salvatore
