with this .config
CONFIG_CGROUPS=yCONFIG_CGROUP_FREEZER=yCONFIG_MODULES=yCONFIG_FREEZER=yCONFIG_PM=yCONFIG_PM_SLEEP=n
the kernel will end compiling with error:
kernel/built-in.o: In function `check_safety':/usr/src/linux-2.6.28/kernel/kprobes.c:126: undefined reference to`freeze_processes'/usr/src/linux-2.6.28/kernel/kprobes.c:139: undefined reference to`thaw_processes'/usr/src/linux-2.6.28/kernel/kprobes.c:139: undefined reference to`thaw_processes'make: *** [.tmp_vmlinux1] Error 1
By read kernel/kprobes.c, I found there maybe a bug:
1. "check_safety" in "kernel/kprobes.c" call thaw_processes if bothCONFIG_PREEMPT and CONFIG_PM defined,2. "thaw_processes" function is implemented in "kernel/power/process.c",3. but it is only used if CONFIG_FREEZER defined, from <linux/freezer.h>,4. else (CONFIG_FREEZER undefined) it's a null macro defined in<linux/freezer.h>,5. but process.o only get compile if CONFIG_PM_SLEEP defined, from"kernel/power/Makefile",
Now I'm confused on how to resolve this?What's the relation of PM, PM_SLEEP, and FREEZER?Which modification of the following will be better?1. modify kernel/Kconfig, let KPROBES depends more?2. modify kernel/kprobes.c, let the conditional compile depends more?3. modify include/linux/freezer.h, move thaw_processes to include/linux/pm.h?4. modify kernel/power/Makefile, let kernel/power/process.c compile onless condition?
Furthermore, there seems no entry for maintainers of "kernel/power/",who maintain that subdir please add your name to the MAINTAINERS file?I just grab some latest touchers of kernel/power/ and kernel/kprobes.cas the recipients here.
-- Cheng Renquan (程任全), Shenzhen, ChinaEddie Izzard  - "I grew up in Europe, where the history comes from."���{.n�+�������+%�����ݶ��w��{.n�+����{��G�����{ay�ʇڙ�,j��f���h��������z_�(�階�ݢj"���m������G������?����&���~��iO��z��v�^�m����������?�I�