linux-kernel - Re: [PATCH 2/2] x86, paravirt: Fix bool return type for PVOP

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Message-ID: <20161208165013.GM3107@twins.programming.kicks-ass.net>
Date:   Thu, 8 Dec 2016 17:50:13 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Pan Xinhui <xinhui@...ux.vnet.ibm.com>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        Peter Anvin <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        Jeremy Fitzhardinge <jeremy@...p.org>,
        Chris Wright <chrisw@...s-sol.org>,
        Alok Kataria <akataria@...are.com>,
        Rusty Russell <rusty@...tcorp.com.au>,
        virtualization@...ts.linux-foundation.org,
        Pan Xinhui <xinhui.pan@...ux.vnet.ibm.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        kernel test robot <xiaolong.ye@...el.com>
Subject: Re: [PATCH 2/2] x86, paravirt: Fix bool return type for PVOP_CALL

On Fri, Dec 09, 2016 at 12:40:35AM +0800, Pan Xinhui wrote:
> 
> hi, Peter
> 	I think I know the point.
> 
> then could we just let __eax rettype(here is bool), not unsigned long?
> I does not do tests for my thoughts.
> 
> @@ -461,7 +461,9 @@ int paravirt_disable_iospace(void);
>  #define PVOP_VCALL_ARGS                                                        \
>         unsigned long __eax = __eax, __edx = __edx, __ecx = __ecx;      \
>         register void *__sp asm("esp")
> -#define PVOP_CALL_ARGS                 PVOP_VCALL_ARGS
> +#define PVOP_CALL_ARGS 					\
> +       rettype __eax = __eax, __edx = __edx, __ecx = __ecx;    \
> +       register void *__sp asm("esp")

Doesn't work on i386 where eax is also an argument register.