Subject: Re: [RFC v1 0/8] x86/init: Linux linker tables
To: "Luis R. Rodriguez" <mcgrof@suse.com>
References: <1450217797-19295-1-git-send-email-mcgrof@do-not-panic.com>
 <56731D32.4040900@zytor.com> <20151217234625.GM20409@wotan.suse.de>
 <56738AAF.2080601@zytor.com>
Cc: "Luis R. Rodriguez" <mcgrof@do-not-panic.com>, tglx@linutronix.de,
        mingo@redhat.com, bp@alien8.de, konrad.wilk@oracle.com,
        rusty@rustcorp.com.au, luto@amacapital.net, boris.ostrovsky@oracle.com,
        mcb30@ipxe.org, jgross@suse.com, JBeulich@suse.com, joro@8bytes.org,
        ryabinin.a.a@gmail.com, andreyknvl@google.com,
        long.wanglong@huawei.com, qiuxishi@huawei.com, aryabinin@virtuozzo.com,
        mchehab@osg.samsung.com, valentinrothberg@gmail.com,
        peter.senna@gmail.com, x86@kernel.org, Michal Marek <mmarek@suse.com>,
        xen-devel@lists.xensource.com, Michael Matz <matz@suse.de>,
        linux-kernel@vger.kernel.org
From: "H. Peter Anvin" <hpa@zytor.com>
Message-ID: <56738E29.3070605@zytor.com>
Date: Thu, 17 Dec 2015 20:40:09 -0800
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On 12/17/15 20:25, H. Peter Anvin wrote:
> 
> /* DECLARE_LINKTABLE_RO */
> extern const struct foo tablename[], tablename__end[];
> 
> /* DEFINE_LINKTABLE_RO */
> DECLARE_LINKTABLE_RO(struct foo, tablename);
> 
> const struct
> foo__attribute__((used,section(".rodata.tbl.tablename.0"))) tablename[0];
> 
> const struct
> foo__attribute__((used,section(".rodata.tbl.tablename.999")))
> tablename__end[0];
> 
> /* LINKTABLE_RO */
> static const __typeof__(tablename)
> __attribute__((used,section(".rodata.tbl.tablename.50")))
> __tbl_tablename_12345
> 
> /* LINKTABLE_SIZE */
> ((tablename__end) - (tablename))
> 
> ... and so on for all the possible sections where we may want tables.
> 

Come to think of it, we could even eliminate the need for a DEFINE
entirely if we made the start and end symbols static.  However, this
would generate an awful lot of identical-but-local symbols which
probably would make the linker slower and definitely would bloat the
debug data.

	-hpa


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