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Re: [Xen-devel] [PATCH v7 04/14] tables.h: add linker table support
- To: "Luis R. Rodriguez" <mcgrof@xxxxxxxxxx>
- From: Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx>
- Date: Thu, 19 Jan 2017 12:13:22 +0100
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- Delivery-date: Thu, 19 Jan 2017 11:13:38 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
On Sun, Jan 15, 2017 at 01:10:47PM -0800, Luis R. Rodriguez wrote:
> A linker table is a data structure that is stitched together from items
> in multiple object files. Linux has historically implicitly used linker
> tables for ages, however they were all built in an adhoc manner which
> requires linker script modifications, per architecture. This adds a
> general linker table solution so that a new linker table can be
> implemented by changing C code only. The Linux linker table was
> inspired by Michael Brown's iPXE's linker table solution, it has been
> been completely re-written and adapted for integration and use on Linux.
Ok, I understand that, but then you say:
> The same philosophy is borrowed, extended and further simplified:
This line made no sense :(
> Linker tables enable an extremely light weight linker build time
> solution for feature ordering and selection, this can help to both
> simplify init sequences in a generic fashion and helps avoiding code
> bit-rotting when desirable. Further changes will be added later
> which will make more evident how code bit rot can be avoided using
> linker tables.
I have no idea why this is needed, nor what it means. I fail to
understand the bit-rot reference.
thanks,
greg k-h
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