^_^ I found the root cause of your issue. u forgot "include<module.h>" in your fs/drop_caches.c ....... BRs, Lin 2009/7/21 er krishna <erkrishna@xxxxxxxxx>: > > I am again repeating the steps, i found something interested, when I am > doing make after making EXPORT_SYMBOL entries in fs/drop_caches.c ( during > kernel compilation); I am getting following warning messages for each of the > exported function from this file only, the messages are: > > data definition has no type or storage class > > type defaults to 'int' in declaration of 'EXPORT_SYMBOL' > > parameter names (without types) in function declaration > > Although these are the warning messages, but why it is coming from > fs/drop_caches file only. The function which I have exported from > fs/buffer.c and block/genhd.c are easily exported and there is no warning > messages against any exported function from other than fs/drop_caches.c > > > On Tue, Jul 21, 2009 at 10:30 AM, Mulyadi Santosa > <mulyadi.santosa@xxxxxxxxx> wrote: >> >> On Mon, Jul 20, 2009 at 9:40 PM, er krishna<erkrishna@xxxxxxxxx> wrote: >> > I have exported three functions from fs/dropcaches.c by making their >> > function declaration in linux/mm.h, compiled the corresponding 2.6.26 >> > kernel & got their entries in System.map file as follows: >> > >> > >> > c0174d98 T drop_slab >> > c0174db2 T drop_pagecache >> > c0174ea7 T drop_caches_sysctl_handler >> >> Upper case T, according to "man nm" means it's a global symbol. In >> other word, other function located in separate object file could >> reference it. OK, seems you do correctly here in exporting symbol >> >> > These entries are quite different from the actual exported functions >> > from >> > other files, it has only T option. >> >> What do you mean by the above paragraph? > > > Mylyadi, Actually when we do compilation, there are warning messages and > when i do insmod there is error and in dmesg it shows that the above symbols > are not resolved (it means there is a linking error) , I have exported some > other function from other file and checked all those entries in > /proc/kallsyms and in System.map file. These are different in nature. Thats > why I asked ? > > > >> >> Other than that, as Peter has suggested, are you sure you have >> declared drop_slab() etc as "extern" function in your module? > > > As I have declared their definition in linux/mm.h, I dont think that i have > to do extern in my module coz i have included linux/mm.h after making proper > declaration of these functions. But let me check with extern once more. > > > > >> >> And as far as I can see here, they are warning messages so there's a >> chance the final kernel module can be successfully build. What happen >> if you do "insmod -f"? Does it work as expected? > > I will let you know after repeating the above steps, coz I am once again > compiling the kernel. > > > >> >> -- >> regards, >> >> Mulyadi Santosa >> Freelance Linux trainer >> blog: the-hydra.blogspot.com > > -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
