Fwd: some questions about kernel debugging

[loody]

hi:

2010/7/14 Ian Lance Taylor <iant@google.com>:
> loody <miloody@gmail.com> writes:
>
>> I write a sample program and compile it with -O1 optimized.
>> (such as gcc -g -O1 -o test test.c)
>> And I can see the local variable.
>> I attach my test program, kernel config and compile flags for your reference.
>> appreciate your help,
>
> Thanks, but it seems like you are showing us a case which works.  Are
> you asking why this works and the kernel doesn't work?  Can you show us
> a case which doesn't work?
I paste the content of my gdb as below:
( I stop at line 1242 and I try to print i but gdb refused)

Program received signal 0, Signal 0.
dummy_timer (_dum=<value optimized out>) at drivers/usb/gadget/dummy_hcd.c:1242
(gdb) p i
$13 = <value optimized out>
(gdb) list
1237            }
1238
1239            for (i = 0; i < DUMMY_ENDPOINTS; i++) {
1240                    if (!ep_name [i])
1241                            break;
1242                    dum->ep [i].already_seen = 0;
1243            }
1244
1245    restart:
1246            list_for_each_entry_safe (urbp, tmp, &dum->urbp_list,
urbp_list) {
(gdb) p i
$14 = <value optimized out>
(gdb)

appreciate your help,
miloody