On Wed, Aug 18, 2021 at 5:38 PM Greg KH <[email protected]> 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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