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:	Tue, 16 Dec 2014 06:55:42 +0100
From:	Juergen Gross <jgross@...e.com>
To:	David Vrabel <david.vrabel@...rix.com>,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	xen-devel@...ts.xensource.com, konrad.wilk@...cle.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 12/15/2014 01:05 PM, David Vrabel wrote:
> 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

Really? In the link below I see:

The types supported are:

STT_FUNC
function
     Mark the symbol as being a function name.
...

So "function" seems to be okay.

>
>> +
>>   	.balign PAGE_SIZE
>
> You can remove this .balign.

Indeed.


Juergen

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