Can Sar wrote:
Please ignore the below, figured it out.
Please enlighten the list too :)
--Swapnil
Can
On Mar 12, 2005, at 4:22 AM, Can Sar wrote:
Hi,
I have a module that copies things to userspace from a log using copy_to_user. I initially wrote the code using semaphores. However, the code is called from places where sleeping is not allowed so I am switching it to spinlocks. Before running into any issues with kmalloc returning NULL (because it now uses GFP_ATOMIC rather than GFP_KERNEL), copy_to_user automatically returns an error, when called under spinlock. I call spin_lock and spin_unlock (no interrupts are off) and have no clue what is causing this. Any advice? I feel like I need to pin pages in memory first or something, but shouldn't that not be a problem until much later?
Thank you very much for your help, Can Sar
-- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
-- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
-- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
