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Date: Wed, 6 Mar 2019 09:27:38 -0800 From: Linus Torvalds <torvalds@...ux-foundation.org> To: Peter Zijlstra <peterz@...radead.org> Cc: Dmitry Vyukov <dvyukov@...gle.com>, Thomas Gleixner <tglx@...utronix.de>, "H. Peter Anvin" <hpa@...or.com>, Julien Thierry <julien.thierry@....com>, Will Deacon <will.deacon@....com>, Andy Lutomirski <luto@...capital.net>, Ingo Molnar <mingo@...nel.org>, Catalin Marinas <catalin.marinas@....com>, James Morse <james.morse@....com>, valentin.schneider@....com, Brian Gerst <brgerst@...il.com>, Josh Poimboeuf <jpoimboe@...hat.com>, Andy Lutomirski <luto@...nel.org>, Borislav Petkov <bp@...en8.de>, Denys Vlasenko <dvlasenk@...hat.com>, LKML <linux-kernel@...r.kernel.org>, Andrey Ryabinin <aryabinin@...tuozzo.com>, Juergen Gross <jgross@...e.com> Subject: Re: [PATCH 1/8] kasan,x86: Frob kasan_report() in an exception On Wed, Mar 6, 2019 at 9:14 AM Peter Zijlstra <peterz@...radead.org> wrote: > > And that (obviously) explodes.. Anybody got any clue why that Xen > trainwreck wants to paravirt: "PUSHF;POP" and "PUSH;POPF" !? Trying to regenerate the IF flag? I dunno. But yeah, I think you could just force all of it into an explicit asm. Or just use native_save_fl(). Except now that I look at it, for some reason that is "extern inline" and we have an out-of-line option. I can't for the life of me imagine why. [ Looking at history. Oh, it's because of that same Xen issue and Xen wanting to use it as a function pointer. Ugh. What a crock. ] Linus
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