There is no kernel stack as such. When we make system call, we enter the kernel mode and CPU SS and SP to the Process specific ring 0 stack (this stack is used in kernel space but belong to specific process). So if Process P1 makes system call and at the same time P2 Also make the system call both the execution threads will have different stacks in kernel mode. There is not kernel stack as whole which is shared by all the process in kernel mode. Read about it in Intel Arch Docs, which explains the Task switch and Stack Switching concepts. Cheers !! Gaurav -----Original Message----- From: kernelnewbies-bounce@xxxxxxxxxxxx [mailto:kernelnewbies-bounce@xxxxxxxxxxxx] On Behalf Of Brandon Niemczyk Sent: Wednesday, September 29, 2004 1:06 PM To: Rakesh Jagota Cc: kernelnewbies@xxxxxxxxxxxx Subject: Re: Difference between process & kernel module On Wed, 29 Sep 2004 11:35:06 +0530, Rakesh Jagota <j.rakesh@xxxxxxxxxxxxx> wrote: > Hi all, > what is the difference between provcess and kernel module? As process > contains text, data, bss, stack & heap, Will all this present for kernel > Module also? asking silly Q? IIUC a kernel module uses the kernel's stack and heap. And because of this modules which use a lot of stack space can cause some serious problems. > > Is it possible to do like whatever we are doing inside the process, can we > do the same in the kernel module. > > Thanks, > rakesh > > -- > Kernelnewbies: Help each other learn about the Linux kernel. > Archive: http://mail.nl.linux.org/kernelnewbies/ > FAQ: http://kernelnewbies.org/faq/ > > -- Brandon Niemczyk http://bniemczyk.doesntexist.com -- 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/
