linux-kernel - Re: [Xen-devel] [PATCH 4/4] xen: use generated hypercall symbols in arch/x86/xen/xen-head.S

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Date:	Mon, 15 Dec 2014 12:05:47 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Juergen Gross <jgross@...e.com>, <linux-kernel@...r.kernel.org>,
	<x86@...nel.org>, <xen-devel@...ts.xensource.com>,
	<konrad.wilk@...cle.com>, <david.vrabel@...rix.com>,
	<boris.ostrovsky@...cle.com>, <tglx@...utronix.de>,
	<mingo@...hat.com>, <hpa@...or.com>, <mmarek@...e.cz>,
	<linux-kbuild@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH 4/4] xen: use generated hypercall symbols
 in arch/x86/xen/xen-head.S

On 11/12/14 18:04, Juergen Gross wrote:
> Instead of manually list each hypercall in arch/x86/xen/xen-head.S
> use the auto generated symbol list.
> 
> This also corrects the wrong address of xen_hypercall_mca which was
> located 32 bytes higher than it should.
> 
> Symbol addresses have been verified to match the correct ones via
> objdump output.
[...]
> +
> +#define HYPERCALL(n) \
> +	.equ xen_hypercall_##n, hypercall_page + __HYPERVISOR_##n * 32; \
> +	.type xen_hypercall_##n, function; .size xen_hypercall_##n, 32
> +#include <asm/xen-hypercalls.h>
> +#undef HYPERCALL

The gas manual[1] suggests the syntax you've used for .type is invalid
and suggest using .type <name>, STT_FUNC

> +
>  	.balign PAGE_SIZE

You can remove this .balign.

David

[1] https://sourceware.org/binutils/docs/as/Type.html#Type
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