Re: [PATCH 3/4] x86/ftrace: make ftrace_int3_handler() not to skip fops invocation

[Linus Torvalds]

On Mon, Apr 29, 2019 at 12:24 PM Andy Lutomirski <luto@xxxxxxxxxx> wrote:
> > Side note: we *already* depend on sti shadow working in other parts of the kernel, namely sti->iret.
>
> Where?  STI; IRET would be nuts.

Sorry, not 'sti;iret' but 'sti;sysexit'

> before commit 4214a16b02971c60960afd675d03544e109e0d75
>     x86/asm/entry/64/compat: Use SYSRETL to return from compat mode SYSENTER
>
> we did sti; sysxit, but, when we discussed this, I don't recall anyone
> speaking up in favor of the safely of the old code.

We still have that sti sysexit in the 32-bit code.

                     Linus