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Date: Sat, 09 May 2020 12:06:28 +0200 From: Thomas Gleixner <tglx@...utronix.de> To: Andy Lutomirski <luto@...nel.org> Cc: LKML <linux-kernel@...r.kernel.org>, X86 ML <x86@...nel.org>, "Paul E. McKenney" <paulmck@...nel.org>, Andy Lutomirski <luto@...nel.org>, Alexandre Chartre <alexandre.chartre@...cle.com>, Frederic Weisbecker <frederic@...nel.org>, Paolo Bonzini <pbonzini@...hat.com>, Sean Christopherson <sean.j.christopherson@...el.com>, Masami Hiramatsu <mhiramat@...nel.org>, Petr Mladek <pmladek@...e.com>, Steven Rostedt <rostedt@...dmis.org>, Joel Fernandes <joel@...lfernandes.org>, Boris Ostrovsky <boris.ostrovsky@...cle.com>, Juergen Gross <jgross@...e.com>, Brian Gerst <brgerst@...il.com>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>, Josh Poimboeuf <jpoimboe@...hat.com>, Will Deacon <will@...nel.org>, "Peter Zijlstra \(Intel\)" <peterz@...radead.org> Subject: Re: [patch V4 part 2 12/18] x86,objtool: Make entry_64_compat.S objtool clean Andy Lutomirski <luto@...nel.org> writes: > On Tue, May 5, 2020 at 7:14 AM Thomas Gleixner <tglx@...utronix.de> wrote: >> >> Currently entry_64_compat is exempt from objtool, but with vmlinux >> mode there is no hiding it. >> >> Make the following changes to make it pass: >> >> - change entry_SYSENTER_compat to STT_NOTYPE; it's not a function >> and doesn't have function type stack setup. >> >> - mark all STT_NOTYPE symbols with UNWIND_HINT_EMPTY; so we do >> validate them and don't treat them as unreachable. >> >> - don't abuse RSP as a temp register, this confuses objtool >> mightily as it (rightfully) thinks we're doing unspeakable >> things to the stack. >> > > Acked-by: Andy Lutomirski <luto@...nel.org> > >> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org> > > Did a From line get eaten? Yes. A couple of patches which were just handed back and forth between me and Peter lost them. Fixed them all up localy already. Thanks, tglx
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