linux-kernel - Re: [PATCH v4 08/10] x86-64: Emulate legacy vsyscalls

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Message-ID: <20110531153551.GA30353@elte.hu>
Date:	Tue, 31 May 2011 17:35:51 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Andy Lutomirski <luto@....edu>
Cc:	x86@...nel.org, Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org, Jesper Juhl <jj@...osbits.net>,
	Borislav Petkov <bp@...en8.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Jan Beulich <JBeulich@...ell.com>,
	richard -rw- weinberger <richard.weinberger@...il.com>,
	Mikael Pettersson <mikpe@...uu.se>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH v4 08/10] x86-64: Emulate legacy vsyscalls


* Andy Lutomirski <luto@....edu> wrote:

> +#ifdef CONFIG_X86_64
> +# define VSYSCALL_EMU_VECTOR		0xcc
> +#endif

> --- a/arch/x86/kernel/traps.c
> +++ b/arch/x86/kernel/traps.c
> @@ -872,6 +872,10 @@ void __init trap_init(void)
>  	set_bit(SYSCALL_VECTOR, used_vectors);
>  #endif
>  
> +	BUG_ON(test_bit(VSYSCALL_EMU_VECTOR, used_vectors));
> +	set_system_intr_gate(VSYSCALL_EMU_VECTOR, &emulate_vsyscall);
> +	set_bit(VSYSCALL_EMU_VECTOR, used_vectors);

That is a generic section of traps.c so it won't build (and makes no 
point) on 32-bit.

	Ingo
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