Hello, Jan. Thank you for many times. "Jan Hudec <bulb@ucw.cz>" wrote: > GFP_NOFS in writeout path (->writepage and below) and GFP_KERNEL in all Oh, I didn't know GFP_NOFS flag. I found the description at http://lwn.net/Articles/22909/ and http://www.win.tue.nl/~aeb/linux/lk/lk-11.html . > however). Of course, you must move your allocations out of the critical > section, which you should do anyway. Does this mean I must not call kmalloc(GFP_KERNEL or GFP_NOFS) inside critical section locked by a semaphore? I introduced a new structure (arrays of 'const char *') in my functions. The arrays are dynamically allocated and expanded as the system runs. I need to use kmalloc() inside my critical section to append an element. So I need to use spinlocks or semaphores. > You should really study the existing locking scheme a bit. You should > know, what can happen when and what states are considered consistent. I've read "Unreliable Guide To Locking" for several times, but I haven't fully understood yet. I'm sorry I'm really a newbie to kernel programming. Regards. -- Tetsuo (a5497108 _at_ anet.ne.jp) -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
