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Date: Mon, 29 Apr 2019 13:07:33 -0700 From: Linus Torvalds <torvalds@...ux-foundation.org> To: Andy Lutomirski <luto@...nel.org> Cc: Steven Rostedt <rostedt@...dmis.org>, Peter Zijlstra <peterz@...radead.org>, Nicolai Stange <nstange@...e.de>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, "H. Peter Anvin" <hpa@...or.com>, "the arch/x86 maintainers" <x86@...nel.org>, Josh Poimboeuf <jpoimboe@...hat.com>, Jiri Kosina <jikos@...nel.org>, Miroslav Benes <mbenes@...e.cz>, Petr Mladek <pmladek@...e.com>, Joe Lawrence <joe.lawrence@...hat.com>, Shuah Khan <shuah@...nel.org>, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>, Tim Chen <tim.c.chen@...ux.intel.com>, Sebastian Andrzej Siewior <bigeasy@...utronix.de>, Mimi Zohar <zohar@...ux.ibm.com>, Juergen Gross <jgross@...e.com>, Nick Desaulniers <ndesaulniers@...gle.com>, Nayna Jain <nayna@...ux.ibm.com>, Masahiro Yamada <yamada.masahiro@...ionext.com>, Joerg Roedel <jroedel@...e.de>, Linux List Kernel Mailing <linux-kernel@...r.kernel.org>, live-patching@...r.kernel.org, "open list:KERNEL SELFTEST FRAMEWORK" <linux-kselftest@...r.kernel.org> Subject: Re: [PATCH 3/4] x86/ftrace: make ftrace_int3_handler() not to skip fops invocation On Mon, Apr 29, 2019 at 12:24 PM Andy Lutomirski <luto@...nel.org> 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
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