Hi, Fuxin Zhang ======= 2003-09-16 18:15:00 WROTE：======= >To compile a module on mips,some compiler flags are required. An example: > CFLAGS= > "-I /usr/local/src/linux-mips/include/asm/gcc -D__KERNEL__ >-I/usr/local/src/linux-mips/include >-Wall -Wstrict-prototypes -Wno-trigraphs -O2 -fomit-frame-pointer >-fno-strict-aliasing -fno-common > -G 0 -mno-abicalls -fno-pic -mcpu=r4600 -mips2 -Wa,--trap -pipe >-DMODULE -mlong-calls" I have tried to change the compiler flags before.And I am not sure the exact meaning of the "-mips2".I think it is related to our mips.When I compile my mips-linux kernel,I used "-mcpu=sb1 " and our mips is mips64 , but the kernel we use is linux for mips32, because I know linux for mips64 doest not support kernel module yet(It is a trouble to me too). One thing confused me is that with the flag "-mips2" or "-mips32", or "-mips64", when I compiled my kernel module,it will get the following error : ______________________________________________________________________________________________ sch_example.c:80: warning: function declaration isn't a prototype sch_example.c:92: warning: function declaration isn't a prototype /tmp/ccxxm0Sw.s: Assembler messages: /tmp/ccxxm0Sw.s:152: Error: opcode not supported on this processor: R6000 (MIPS2) `lld $3,8($6)' /tmp/ccxxm0Sw.s:154: Error: opcode not supported on this processor: R6000 (MIPS2) `scd $2,8($6)' /tmp/ccxxm0Sw.s:245: Error: opcode not supported on this processor: R6000 (MIPS2) `lld $4,8($6)' /tmp/ccxxm0Sw.s:247: Error: opcode not supported on this processor: R6000 (MIPS2) `scd $3,8($6)' ________________________________________________________________________________________________ But when i removed that flags it will be compiled ok, of course it is still can not work ok when i try to "insmod".:)~ Any advice for me ? >And you may have know that there are 2 different world of mips: big >endian and little endian. When >using cross compiler,you should choose the correct toolchain(often >mipsel-xxx vs. mips-xxx). > Yes, I have noticed this before and my others simple kernel module can be compiled and "insmod" ok. So i think it is the tq_timer or the queue_task that arose the trouble as you said follow. >But these normally lead to other errors, so again check for your kernel >version about task queue data >structures. (Does your toolchain's kernel headers consistent with the >one running on mips?) I have notice the change of the "struct tq_struct" . But I am not sure whether the task queue is the best choice to be used here. Because I know the evolution of "task queque-->tasklet-->softirq" . It seems "task queque" is a obsolete way.Ha~, maybe I should try to learn how to use tasklet or softirq. Is it a right think ? What is your advice? And what should I do ? As a newbie to the kernle module ,I am so so so confused. Thank you again. You are an excellent Linux Man. > >Guangxing Zhang wrote: > >>Hi, >> >> Inspired by your advice , I have changed the method of preventing the module >>from being unloaded while "intrpt_routine" is still in the task queue.Now it can freely >>"insmod" and "rmmod" in my linux(2.4.18-3,not on mips) at any time.But unfortunatlly, >>When I port it to mips_linux, it get some errors as you can see in my mail to >>linux-mips@linux-mips.org . It confuses me .Why? And what should I MUST pay attention to >>or what should I MUST learn if I I want to implement schedualing a function to be called >>on every timer interrupt. >> >> Thank you again and eagering your enthusiastic again! >> >> >>======= 2003-09-16 13:17:00 WROTE：======= >> >> >> >>>Guangxing Zhang wrote: >>> >>> >>> >>>>Hi, Fuxin Zhang >>>> >>>> >>>> >>>> >>>> >>>>>for any warnings. BTW, I don't the method you used to cleanup is safe, >>>>>there maybe a task queued but not executed at the time you >>>>>'rmmod',doesn't it? >>>>> >>>>> >>>>> >>>>> >>>>Yes ,in http://www.faqs.org/docs/kernel/x1145.html#AEN1201 , it mentions the >>>>situation as you said.And just to overcoming it ,it use the sleep_on().But as you >>>>see, now it can not "rmmod" correctly and my linux will broke. >>>> >>>>As a newbie to kernel module ,I am not sure why and not know how to scheduale a >>>>function to be called on every timer interrupt or every seconds in kernle module. >>>>Eagering your help! >>>> >>>> >>>> >>>> >>>>>>interrupt >>>>>> >>>>>> >>>>>> >>>>>> >>>Most ethernet adapter driver(e.g. drivers/net/eepro100.c) use timer,you >>>can check them for examples. >>> >>> >>>Have you check the sleep_on and wakeup routine's argument type? They >>>should be wait_queue_head_t * >>>for recent kernels? >>> >>> >> >>= = = = = = = = = = = = = = = = = = = = >> >> >> >> Guangxing Zhang >> guangxing@ict.ac.cn >> 2003-09-16 >> >> >> >> >> >> >> = = = = = = = = = = = = = = = = = = = = Guangxing Zhang guangxing@ict.ac.cn 2003-09-17
