Re: [PATCH v22 8/8] x86/vdso: Add ENDBR64 to __vdso_sgx_enter_enclave
- From
- Peter Zijlstra <peterz@infradead.org>
- Date
- 2021-03-11 08:43:24
- Also in
- linux-api, linux-doc, linux-mm, lkml
- Reply to
- Jarkko Sakkinen, 2021-03-11
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.