Re: [PATCH 07/14] x86/ibt: Clean up is_endbr()

[Josh Poimboeuf]

On Fri, Sep 27, 2024 at 09:49:03PM +0200, Peter Zijlstra wrote:
> Pretty much every caller of is_endbr() actually wants to test something at an
> address and ends up doing get_kernel_nofault(). Fold the lot into a more
> convenient helper.
> 
> Note: this effectively reverts commit a8497506cd2c ("bpf: Avoid
> get_kernel_nofault() to fetch kprobe entry IP") which was entirely the
> wrong way to go about doing things. The right solution is to optimize
> get_kernel_nofault() itself, it really doesn't need STAC/CLAC nor the
> speculation barrier. Using __get_user is a historical hack, not a
> requirement.

But these patches don't actually optimize get_kernel_nofault()?

-- 
Josh