linux-kernel - Re: [PATCH v2] KVM: x86: remove ignored type attribute

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Message-ID: <cace40f9-2d90-c27b-675d-4d12a4e2ddc6@redhat.com>
Date:   Fri, 30 Jun 2017 12:46:07 +0200
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Nick Desaulniers <nick.desaulniers@...il.com>
Cc:     Radim Krčmář <rkrcmar@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] KVM: x86: remove ignored type attribute



On 28/06/2017 04:37, Nick Desaulniers wrote:
> The macro insn_fetch marks the 'type' argument as having a specified
> alignment.  Type attributes can only be applied to structs, unions, or
> enums, but insn_fetch is only ever invoked with integral types, so Clang
> produces 19 -Wignored-attributes warnings for this source file.
> 
> Signed-off-by: Nick Desaulniers <nick.desaulniers@...il.com>
> ---
> Changes in v2:
> * prefer memcpy
> * fix up trailing tabs
> 
>  arch/x86/kvm/emulate.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
> index 7611c034bf95..f9c0359f3fdd 100644
> --- a/arch/x86/kvm/emulate.c
> +++ b/arch/x86/kvm/emulate.c
> @@ -900,7 +900,7 @@ static __always_inline int do_insn_fetch_bytes(struct x86_emulate_ctxt *ctxt,
>  	if (rc != X86EMUL_CONTINUE)					\
>  		goto done;						\
>  	ctxt->_eip += sizeof(_type);					\
> -	_x = *(_type __aligned(1) *) ctxt->fetch.ptr;			\
> +	memcpy(&_x, ctxt->fetch.ptr, sizeof(_type));		\
>  	ctxt->fetch.ptr += sizeof(_type);				\
>  	_x;								\
>  })
> 

Fixed up the tab and pushed, thanks.

Paolo