Re: [PATCH v22 8/8] x86/vdso: Add ENDBR64 to __vdso_sgx_enter_enclave

[Yu, Yu-cheng]

On 3/11/2021 12:42 AM, Peter Zijlstra wrote:
> On Thu, Mar 11, 2021 at 05:36:06AM +0200, Jarkko Sakkinen wrote:
> > Does it do any harm to put it there unconditionally?
>
> Blows up your text footprint and I$ pressure. These instructions are 4
> bytes each.
>
> Aside from that, they're a NOP, so only consume front-end resources
> (hopefully) on older CPUs and when IBT is disabled.

Thanks Peter.  I think probably we'll do the macro Boris suggested. 
That takes care of the visual clutter, and eliminates the need of using 
.byte when the assembler is outdated.

--
Yu-cheng