Re: 8aeb879baf12 - significant system call latency regression, bisected

[Linus Torvalds]

On Mon, 15 Jun 2026 at 07:38, H. Peter Anvin <hpa@xxxxxxxxx> wrote:
>
> - Since we no longer use the sys_call_table[] as a jump table,
>    do we actually need array_index_nospec()? in do_syscall_x64|32?

Well, gcc will still generate a jump table from it when retpolines
aren't enabled.

So I think we do want that array_index_nospec. It should be cheap
insurance against the simplest kinds of speculation issues.

              Linus