Re: [PATCH v2 08/14] x86/retpoline: Create a retpoline thunk array

[Andrew Cooper]

On 20/10/2021 16:57, Josh Poimboeuf wrote:
> On Wed, Oct 20, 2021 at 12:44:50PM +0200, Peter Zijlstra wrote:
>> Stick all the retpolines in a single symbol and have the individual
>> thunks as inner labels, this should guarantee thunk order and layout.
> How so?
>
> Just wondering what the purpose of the array is.  It doesn't seem to be
> referenced anywhere.

The array property is what makes:

> +	reg = (target - &__x86_indirect_thunk_rax) /
> +	      (&__x86_indirect_thunk_rcx - &__x86_indirect_thunk_rax);

safe in the next path.

~Andrew