linux-kernel - Re: [patch V4 part 3 29/29] x86/entry/32: Convert IRET exception to IDTENTRY

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Message-ID: <e50333c6-386d-6b77-dd67-ea213782b1b7@oracle.com>
Date:   Thu, 7 May 2020 18:47:17 +0200
From:   Alexandre Chartre <alexandre.chartre@...cle.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, "Paul E. McKenney" <paulmck@...nel.org>,
        Andy Lutomirski <luto@...nel.org>,
        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>
Subject: Re: [patch V4 part 3 29/29] x86/entry/32: Convert IRET exception to
 IDTENTRY_SW


On 5/5/20 3:44 PM, Thomas Gleixner wrote:
> From: Thomas Gleixner <tglx@...utronix.de>
> 
> Convert the IRET exception handler to IDTENTRY_SW. This is slightly
> different than the conversions of hardware exceptions as the IRET exception
> is invoked via an exception table when IRET faults. So it just uses the
> IDTENTRY_SW mechanism for consistency. It does not emit ASM code as it does
> not fit the other idtentry exceptions.
> 
>    - Implement the C entry point with DEFINE_IDTENTRY_SW() which maps to
>      DEFINE_IDTENTRY()
>    - Fixup the XEN/PV code
>    - Remove the old prototyoes
>    - Remove the RCU warning as the new entry macro ensures correctness
> 
> No functional change.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> 

For all patches of part 3:

Reviewed-by: Alexandre Chartre <alexandre.chartre@...cle.com>

alex