Hi,
Thanks a lot manish for your suggestions, i am able to move ahead a little bit.. but the problem is still not solved. It seemed now that head and slab_object are sharing the same memory. How can that be possible when i am allocating using kmem_cache_alloc() ?
The code snippet is as follows:
slab_object = kmem_cache_alloc(test_struct_cachep, GFP_KERNEL); if (!slab_object) return -ENOMEM; ==> strcpy(slab_object->word, mesg_ins); printk("HEAD points to : %s\n",head->word);
after the strcpy both head->word and slab_object->word points to the same things while just before that strcpy() they both point to the different strings.
Sorry for being so naive. Please Advice. The code is attached with this mail.
Thanks and Regards, Naren
ps: Also while removing the module the kernel give an oops, i couldn't figure out the reason for that.
hi,
again head->word is not allocated. You are copying mesg_ins to it without allocating any space.
strcpy(slab_object->word, mesg_ins);
kmem_cache_alloc() only allocates space for sizeof(struct test_slab) You havent allocated for slab_object->data. use kmalloc here too.
slab_object = kmem_cache_alloc(test_struct_cachep, GFP_KERNEL);
if (!slab_object)
return -ENOMEM;
slab_object->word = kmalloc(20, GFP_KERNEL);
strcpy(slab_object->word, mesg_ins);
printk("HEAD points to : %s\n",head->word);But if you only want to point.use slab_object->word = &mesg_ins;
slab_object = kmem_cache_alloc(test_struct_cachep, GFP_KERNEL);
if (!slab_object)
return -ENOMEM;
slab_object->word = &mesg_ins;
printk("HEAD points to : %s\n",head->word);more memory problems. Need more practices on pointers.:)
regards manish
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