Re: [PATCH 2/2] kprobes: check CONFIG_FREEZER instead of CONFIG_PM

[Masami Hiramatsu]

Ingo Molnar wrote:
> * Len Brown <lenb@xxxxxxxxxx> wrote:
>
> > > > Check CONFIG_FREEZER instead of CONFIG_PM because kprobe booster
> > > > depends on freeze_processes() and thaw_processes() when CONFIG_PREEMPT=y.
> > > >
> > > > This fixes a linkage error which occurs when CONFIG_PREEMPT=y, CONFIG_PM=y
> > > > and CONFIG_FREEZER=n.
> > > >
> > > > Reported-by: Cheng Renquan <crquan@xxxxxxxxx>
> > > > Signed-off-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
> > > > Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>
> > > > ---
> > > >  arch/ia64/kernel/kprobes.c |    2 +-
> > > >  arch/x86/kernel/kprobes.c  |    2 +-
> > > >  kernel/kprobes.c           |    2 +-
> > > >  3 files changed, 3 insertions(+), 3 deletions(-)
> > > looks good, the x86 bits:
> > >
> > > Acked-by: Ingo Molnar <mingo@xxxxxxx>
> > man, we have too many config options:-)
>
> the non-x86 bits (kernel/kprobes.c) are crappy though, and broke -rc4
> allnoconfig:
>
> kernel/built-in.o: In function `collect_garbage_slots':
> kprobes.c:(.kprobes.text+0x16e4): undefined reference to `freeze_processes'
> kprobes.c:(.kprobes.text+0x16f2): undefined reference to `thaw_processes'
> kprobes.c:(.kprobes.text+0x176b): undefined reference to `thaw_processes'

Hmm, it seems that kernel/power/built-in.o was not linked to .tmp_vmlinux1.

  ld -m elf_i386 --build-id -o .tmp_vmlinux1 -T arch/x86/kernel/vmlinux.lds
arch/x86/kernel/head_32.o arch/x86/kernel/head32.o arch/x86/kernel/head.o
arch/x86/kernel/init_task.o  init/built-in.o --start-group  usr/built-in.o
arch/x86/kernel/built-in.o  arch/x86/mm/built-in.o  arch/x86/mach-default/built-in.o
arch/x86/crypto/built-in.o  arch/x86/vdso/built-in.o  kernel/built-in.o
mm/built-in.o  fs/built-in.o  ipc/built-in.o  security/built-in.o  crypto/built-in.o
block/built-in.o  lib/lib.a  arch/x86/lib/lib.a  lib/built-in.o
arch/x86/lib/built-in.o  drivers/built-in.o  sound/built-in.o  firmware/built-in.o
arch/x86/pci/built-in.o  net/built-in.o --end-group
kernel/built-in.o: In function `collect_garbage_slots':
kprobes.c:(.kprobes.text+0x16e4): undefined reference to `freeze_processes'
kprobes.c:(.kprobes.text+0x16f2): undefined reference to `thaw_processes'
kprobes.c:(.kprobes.text+0x176b): undefined reference to `thaw_processes'

At kernel/Makefile:53, I can see

obj-$(CONFIG_PM) += power/

but CONFIG_PM was not set in config

> Could someone please fix all of this without #ifdefs?
>
> 	Ingo

--
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America) Inc.
Software Solutions Division

e-mail: mhiramat@xxxxxxxxxx

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