linux-kernel - Re: [Xen-devel] [PATCH 1/4] xen: build infrastructure for generating hypercall depending symbols

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Date:	Mon, 15 Dec 2014 10:00:40 +0000
From:	"Jan Beulich" <JBeulich@...e.com>
To:	"Boris Ostrovsky" <boris.ostrovsky@...cle.com>
Cc:	<david.vrabel@...rix.com>, <x86@...nel.org>, <tglx@...utronix.de>,
	"xen-devel" <xen-devel@...ts.xenproject.org>,
	<konrad.wilk@...cle.com>, <mingo@...hat.com>,
	"Juergen Gross" <JGross@...e.com>, <mmarek@...e.cz>,
	<linux-kbuild@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<hpa@...or.com>
Subject: Re: [Xen-devel] [PATCH 1/4] xen: build infrastructure for
 generating hypercall depending symbols

>>> On 12.12.14 at 23:48, <boris.ostrovsky@...cle.com> wrote:
> On 12/11/2014 01:04 PM, Juergen Gross wrote:
>> diff --git a/scripts/xen-hypercalls.sh b/scripts/xen-hypercalls.sh
>> new file mode 100644
>> index 0000000..e6447b7
>> --- /dev/null
>> +++ b/scripts/xen-hypercalls.sh
>> @@ -0,0 +1,11 @@
>> +#!/bin/sh
>> +out="$1"
>> +shift
>> +in="$@"
>> +
>> +for i in $in; do
>> +	eval $CPP $LINUXINCLUDE -dD -imacros "$i" -x c /dev/null
>> +done | \
>> +awk '$1 == "#define" && $2 ~ /__HYPERVISOR_[a-z][a-z_0-9]*/ { v[$3] = $2 }
>> +	END {for (i in v) if (!(v[i] in v))
>> +		print "HYPERCALL("substr(v[i], 14)")"}' | sort -u >$out
> 
> Why do you 'sort -u'? Do you expect multiple definitions of the same 
> hypercall?

For upstream I think this could be dropped; the original version needs
this as the classic tree sticks more closely to the original xen.h (which
has a couple of backward compatibility defines which would get in the
way). Otoh it does no harm afaict...

Jan

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