On Wed, Aug 18, 2021 at 5:38 PM Greg KH <greg@xxxxxxxxx> 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!!
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