On Wed, Aug 18, 2021 at 5:38 PM Greg KH <greg@kroah.com> wrote:
On Wed, Aug 18, 2021 at 05:03:07PM +0530, Lloyd wrote:
Hi,
I am starting to write linux kernel mode code. I am on Ubuntu 20.04. I have written the following code
The line DynPage[i]=0; //CRASH causes a crash. Can you please guide on the reason for the crash?
Thanks a lot in advance, Lloyd
#pragma GCC push_options #pragma GCC optimize("O0")
Why are you using these options? Try removing them and see what happens.
Thanks a lot Greg. Yes, the code works now. The assignment inside the for loop (DynPage[i]=0) is not used anywhere below. I thought that, when the compiler optimizes the code, it can remove that line. I am writing a small benchmarking application. So, I don't want that line to be removed by the compiler. Is there a better way to achieve this? I am also surprised to see that disabling compiler optimization for a function caused my code to crash!!