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

* Masami Hiramatsu <mhiramat@redhat.com> wrote:

> Ingo Molnar wrote:
>> * Len Brown <lenb@kernel.org> 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@gmail.com>
>>>>> Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
>>>>> Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
>>>>> ---
>>>>> 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@elte.hu>
>>> 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

Sounds plausible. We need a fix for this - it's broken upstream.

Ingo


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