linux-kernel - Re: [patch V2 05/17] x86/traps: Make interrupt enable/disable symmetric in C code

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Message-ID: <1c6ad81c-9518-909a-03d2-e2a2cf53240d@oracle.com>
Date:   Wed, 6 Nov 2019 17:19:44 +0100
From:   Alexandre Chartre <alexandre.chartre@...cle.com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Will Deacon <will@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>, kvm@...r.kernel.org,
        linux-arch@...r.kernel.org, Mike Rapoport <rppt@...ux.ibm.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Miroslav Benes <mbenes@...e.cz>
Subject: Re: [patch V2 05/17] x86/traps: Make interrupt enable/disable
 symmetric in C code


On 10/23/19 2:27 PM, Thomas Gleixner wrote:
> Traps enable interrupts conditionally but rely on the ASM return code to
> disable them again. That results in redundant interrupt disable and trace
> calls.
> 
> Make the trap handlers disable interrupts before returning to avoid that,
> which allows simplification of the ASM entry code.
> 
> Originally-by: Peter Zijlstra <peterz@...radead.org>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> ---
>   arch/x86/kernel/traps.c |   32 +++++++++++++++++++++-----------
>   arch/x86/mm/fault.c     |    7 +++++--
>   2 files changed, 26 insertions(+), 13 deletions(-)
> 

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

alex.